OTA Optical Tube Assembly
Astronomical CCD Camera
Night Vision Devices
Star Trackers - Navigation Instruments - Star trackers are used in aircraft, missiles and space craft and can work day & night
Scientific CCD Cameras - Scientific - Industrial -Security CCD cameras - spreadsheet
Low Light TV Cameras
GOTO Equatorial Mount - Mount Spreadsheet
Automated CCD camera Searches
Near Earth Objects
Northern Light (Auroras)
Kodak - Solid
State Imaging - KAF
Series - KAF
Plus Series -
DS 02-009 KAF Series Full-Frame CCD Sensors Binning Mode Operation -
DS 02-006 Blue Plus Image Sensor Overview -
DS 03-003 KLI-10203 Reference Design -
When Digital cameras Need Large Pixels -
Digital Evaluation Boards - KAF Series -
Supports 0261, 0401*, 1001, 1302, 1401, 1602*, 2000, 3000, 3040, 4204, 4300, 6302, 6303, 16801 and Blue+ version of each
* the KAF 0400 and 1600 CCD chips plug directly into the eval board, the others are on daughter boards
Altera - makes the two 7000S PLD used by the Kodak Eval board -EEPROMs that can be programmed on the eval board by means of a 10 pin JTAG connector.
Analog Devices - AD9816 12 bit, 6 Msps A/D converter for Kodak Eval board (3 chan A/D but only 1 chan is used for eval board)
BitFlow - has a Raptor frame grabber board that can accept the 12 bits of differential TTL (RS-422) signal data and the sync signals
Loral - General Description -
Marlow Industries, Inc. - thermoelectric cooling technology
Melcor - Peltier coolers -
MIT Lincoln Laboratory CCID20 - 2048 x 4096 = 2 ea, 2046x2046 arrays side by side, GTS-2 Telescope, NEO system detects satellites: 1998 KH17 -
History of Lincoln Near Earth Asteroid Research (LINEAR) Project (2560x1960 Lincoln Laboratory CCD)
National Astronomical Observatory of Japan CCD Detector Lab -
Mitsubishi - artificial retina - CCD array & image processing in one package 32x32 or 128x128 pixels not intended for astronomy, but who knows?
Orbit -Sunnyvale, CA (800)331-4617 General Description -
Philips - 7k x 9k -
Rockwell & Boing - IR Focal Plane Arrays -
Sanyo - LC9931 - is teaming with Philips on CCD development & production maybe because they both don't have web pages
Scientific Imaging Technologies, Inc. (SITe) (Formerly Tektronix) - SITe 512 x 512 Thermoelectrically Cooled - Tutorial on CCD technology.pdf -
Tektronix - TK512CB - TK1024M -
Sony Semiconductor - Area Sensor - ICX085AL progressive scan monochrome 2/3" 1300 x 1030, 6.7 x 6.7 um pixels 20 pin DIP pkg. (ICX061?)
Suni Microsystems -
Texas Instruments - Video and Imaging Products - CCD chips - CCD AREA IMAGE SENSORS Family - Device Listing -
CCD Image Sensors and Analog-to-digital Conversion -
Interlace Operation in TI Virtual-phase CCD Image Sensors -
Thomson-CSF - Area Array -
UCO/Lick Observatory -
An astronomical camera needs to have provision to cool the CCD chip otherwise the noise for exposure times over a few seconds will degrade the image. This is the main separator between conventional CCD cameras and astronomical cameras.Adirondack Video Astronomy - Astrovid - Starlight Xpress - CCD Tutorial -
Sky & Telescope CCD web pages - introductory material
For very rough cooled Astronomical CCD camera pricing try 1 cent per pixel or $80 per square mm of active area.
CCD Astronomical Cameras Spreadsheet - sorted by Area of a pixel
I am interested in satellite Orbit Determination (Search) which is different from satellite prediction or tracking where the orbital elements are already known.
I have found these different ways of searching the sky. There may be more.
Different scanning methods would be used depending on the speed of satellite being looked for. The first method above would use very short exposure times for low orbiting satellites and longer exposure times for higher orbits.
- Equatorial mount and time exposure. Any streak is not a star and is moving fairly quickly.
- Equatorial mount and multiple exposures separated in time. Any "blinking" points are not stars and are moving slowly.
- Any mount stopped with the CCD scanned at the star drift rate. Requires drift track 90 deg to columns in CCD. Any streaks are not stars. (Wiki: Time delay and integration)
- Equatorial mount moving at star rate in RA but scanned in DEC & CCD scanned to match DEC rate. Similar to the above.
Orbit determination from observations - compute orbit parameters from observations, aimed at NEOs.
There are trade offs in choosing the parts of a system to do this.
OTA Optical Tube Assembly24 April 2005 - The KStar Telescope seems ideal for this application and probably was designed for the Air Force to do just this.
It has a 5 degree FOV and uses spherical mirrors (much lower in cost than any thing but a flat mirror) and has an adjustable f number (just the thing to match the CCD array to the seeing conditions.
Oceanit web page with KStar overview -
pdf Brochure describing Scope - 16" model shown but could be between 250 mm and 2 m
Review by the A.F. AMOS Fall 2002 Newsletter
It's either Pat. Pend. or I can't find the patent.
One of the RAVEN A.F. Projects uses the KStar scope and the Paramount Mount and software.
"Raven is not an acronym; the name refers to Odin’s ravens from Norse mythology. A Raven telescope is not a specific configuration of telescope, mount, camera, and computer hardware and software. Raven is the concept of combining commercially available components and integrating them into a system supporting a specific requirement. Just as you can go into a camera store and purchase a system optimized for a specific need, such as telephoto coverage of sporting events, you can configure a Raven telescope system to support a specific mission, such as follow up observations of near-Earth objects."Raven Automated Small Telescope Systems -
Brief Report on "Informal NEO Meeting" at CfA, July 27, 1997 -
The Richey-Chretien telescope (Wiki) uses two hyperbolic mirrors and makes a great scope for silicon based imaging, but it's an expensive design and so far I haven't seen them offered with fast f numbers, most are around f/ 10.
RC Optical Systems -
Cassegrain -> uses two parabolic mirrors (Wiki)
The military systems typically use 1 meter scopes with low f ratios and very large CCD arrays. They are looking for very small objects meaning star MAG numbers that are quite large (maybe MAG 20+). A system that would do the same job but with a much more conservative visual MAG limit (like MAG 12) should be possible with a much smaller diameter scope. This implies a refactor telescope so that there is no blocking of the light by objects in the scope. It also points to using a high quantum efficiency CCD like the SITe series. The widest possible Field of View (FOV) is very desirable because the time required to search the sky will be reduced.
My interpretation of "all about Telescopes" is that the linear image size of a star in microns (um) is approximately the same as the f ratio.
That is to say that an f 4 OTA will have an image size of 4 um, f8 will be 8 um etc. The image size is independent of FL if the seeing is perfect. If a video camera is used with an optical system whose objective diameter <=12" then some frames will have perfect seeing. To image also requires a mount that can point extremely accurately, the LX-200 can track a satellite as a point of light, and as a fuzzy image (see the Sat Track software). The Merlin mount or equivalent pointing accuracy type of mount is needed.
For larger diameter objectives or exposure times > 1/100 second the seeing will enlarge the star image to about a few arc seconds to a dozen arc seconds. In that case the focal length will be the lever that converts the angle into distance. This is the basis for the recommendations about astronomical CCD camera OTA focal length.
In the GEODSS system at Peterson AFB and other locations: " The main telescopes have a 40-inch ( 1 meter) aperture and a two-degree field of view. The auxiliary telescopes have a 15" aperture and six-degree field of view."
CELESTRON FASTAR 8 - approximatly an f 1.95 Schmidt camera with the camera mounted in front of the scope, but only 30 by 40 minutes of arc field of view.
Astronomical CCD CameraThere is a question in my mind about matching the CCD pixel size to the scope FL (popular for star imaging) or to the f ratio which determines the image size or some other criteria. The classical 2 pixels per star is based on the appearance of star images. For this purpose I don't think that is important. For example for widest FOV there would be many stars per pixel. If the satellite moved across many pixels during an exposure it would show up as a streak. If a wide angle lens was used the satellite would be exposing the pixel all the time that it was on that pixel. If multiple stars were on a single pixel it would just add them up. I think you would still see the streak because most of the sky is black. A low orbiting satellite will cross the 5 degree FOV of my binoculars in a few seconds.
For high orbits where satellite movement is slow the time between two or more exposures needs to be long so that blinking will find the satellite. There is a trade off here between FOV and limiting MAG.
More investigation is needed. - My current thinking is to use a night vision device and conventional TV camera.
If a streak appears that starts or ends at the edge of the frame then you do not know when the satellite started or ended. If the exact time the exposure was started and stopped is recorded then you will know that the satellite was in the FOV of the frame sometime during the exposure. If a mechanical shutter is used to block the exposure for a short time every so often then the exact position of the satellite could be determined.
CMOS CamerasThese are based on CMOS memory chips which are much lower in cost than CCD chips.
cmos Video Camera Modules - using the OmniVision chip
OmniVision Technologies, Inc. - OV7110 644x484 B&W data sheet has reference camera design- Eval Modules -
Agilent - HDCS2000 640 x 480 cmos imagerKBGear Interactive - JamC@m 640x480 VGA digital camera $ 89.99 -
Logitech -USB QuickCam Express PC video camera - $49.95 MSRP
Xirlink -USBC-It cameras $80-$130 depending on software- IBM PC cameras -
Night Vision Devices (NVD)Quote about a GEN 3 device "One thing I remember about the instrument is how many moving satellites and aircraft were visible in the night sky. With the naked eye, you don't see these dim moving objects readily, but through the night vision scope, they stand out. The sky was being criss-crossed with them!"
Night Vision Devices have a phosphor very much like early cathode ray tubes (CRT). And like a CRT they will burn if a bright image is left on the screen for a length of time. If a NVD is left running in daylight the tube will be permanently damaged. To fix this just remove the DC power during the daytime.
The NVD has sparkles. The I3Piece has an optional averager that reduces these. A better approach would be to have the computer remove them by comparing the prior and following frame to the current frame. If there is a pixel that is bright but the prior and following pixels are black, then set that pixel to black. These are the kind of image processing steps that the IMAQ image processing package from LabVIEW is designed to do.
This looks to be a more cost effective way to see dim satellites and also have a wide field of view.
This is an interesting way to see sats. You do not need night adapted eyes to use the NVD since it has a bright output. I use my strong (left) eye in the NVD and keep my other (right) eye open and the right eye does get night adapted. Last night (11/2/99) I saw a sat to the East about 10 deg above the horizon going to the North, later I saw a formation of 2 sats (should have 3 or 4) going overhead to the South.
Generation Year Description Gain 0 1939 - 1945 WWII Vacuum-enveloped photon detectors poor I 1960 Vietnam era tri-alkali photocathodes 1,000 II early 70's microchannel-plate (MCP) amplifier 20,000 II+ improved bias voltage and construction III sensitivity to IR & optical IV no ion -barrier film V 1999 drum to rotate NVD to allow 24 hr use
An Ideal NVD Design for a Staring System to View Satellites or Meteors
- Objective is a lens with a FL in the 30 to 40 mm range and is corrected to focus 400 to 1000 nm light (i.e. short IR and visible are ALL in focus) the area of good focus would be a circle 25 mm (1") in diameter - it is desirable to have no barrel or pin cushion distortion, that is to say the image of a checker board would have straight lines, this may be a 35 mm camera lens or something else?
- use a 1" in and 1" out GEN3 image intensifier tube with variable gain (selected for high resolution)
- use a relay lens that is designed to work at the wavelength of the output phosphor of the image intensifier tube - it needs to cover the 1" tube output and put all the light on the TV camera chip (1/2" CCD might be a good choice).
- Software to threshold each frame and look at frame to frame "on" pixels. If a pixel (or one of it's 8 adjacent pixels) is not on in the prior or following frame then turn it off. This should eliminate sparkle noise from the image intensifier tube and not increase the background brightness the way simple averaging would. This can not be done in real time, but as a post processing step.
Better would be to de-sparkle real time in hardware.
The Collins Electro Optics I3 system is close to this but uses an 18mm (about 3/4") Gen 3 image intensifier tube.Adirondack Video Astronomy - who makes the Astrovid 2000 also has their own DSI-25 which is a Gen 2, 25 mm intensifier for astro-video use & Integral Technologies Flash Bus MV Lite frame grabbers - slightly less $ than the I3
The New Adriondack StellaCam EX TV camera may work well without using a NVD.
Alista Ltd.- lower cost products
Allied Signal - Night Vision System - http://www.alliedsignalaerospace.com/aerospace/products/aircraft_products/products/night_vision_system.html
B.E. Meyers & Co. - many NVD and IR devices & systems
Bresser - german
Dedal-NV - Russian manf, English pages - Gen 2, 2+ & 3
Delft Electronic Products BV - manufacturers a line of intensified image sensors
Collins Electro Optics LLC -Real time ccd video using the I3 system - Drawing- Block Diagram - has 18 mm tube system based on a model 2000 - review by Ed Ting & reply Collins reply, Product Images, maybe 1998 vintage
Astrovid video camera - a 42mm FL camera lnes (I have the AF Nikor 35-70mm 1:2.8D zoom lens already) will give a 1 inch = 1 degree FOV on a 15" monitor! For the 8.4x9.4 micron pixel in the Astrovid 2000 a lens working at f 8 or f9 would produce an image about 1 pixel in size. Sky & Telescope Review - uses Fast
a 50 mm f1.3 objective lens is now available @ $250 for the I3 system (see Sky & Tel Dec. 99)
ITT Industries Night Vision - how light-amplifying works -
Edmond Scientific - has a C-mount & T-mount modular system of lens holders and relay lens that may make the basis for a system similar to the I3.
EEV - also repair & repair equipment
Electrophysics Corp. - AstroScope 9350 - is an 18mm system very similar to the I3PIECE but much more expensive
Excalibur Electro Optics, Inc. - good selection of tubes
First Defense Systems, Inc.-
Fort Rucker - US Army - Library with many on line manuals -
GSCI - low cost products
Hamamatsu - many years in photo optical business, excellent products - Image Intensifiers (many types)
ITT Night Vision -
ITT - Image Intensifier Tubes - AN/PVS-14 - variable gain, GEN3, camera adapters $3,495
Kalimex - night vision devices Czech Republic, difficult ordering - long waits -very iffy - no response to email -
Lan Optics International - Russian optics
Laser King - ITT price list - AMT prices -
Litton- Poly-Scientific (comercial products) - NightVision CCTV light intensifiers - @ NightLine - M944
Litton Electro-Optical Systems - Image Intensifier Tubes - M944 - modular system (M942 GEN2, M944 GEN3)
MOD-3 ASTRO C-Mount Night Vision Monocular - At Ultimate Night Vision - is a version of the AN/PVS-14 that accepts a C-Mount adapter in place of the normal objective lens, thus can be used at the back of a telescope at prime focus, not afocal mounting. Maybe 2004 vintage. Similar to the Collins EO I3.
Multimedia model AV Master 2000 frame grabber & software -
nightline - M944 Night Vision Pocketscope by L-3 EOS
Nightquest -ITT dealer
Night Vision - official ITT web page
Night Vision Devices - More Information - Links -
Night Vision Systems -
Night-Vision Goggles Operations Weather Software - Air Force
Night Vision Mall -
Night Vision Optics - a division of RTC Inc, Iowa, USA - looks like mostly GEN1+ tubes, maybe imports
Night Vision Systems Fleet Support Team - Navy - AN/AVS-6, MXU-810/U, AN/AVS-9
Micro Video (TM) Products - Night Vision Equipment - ITT 160DX
Optics HQ - many brands & types of NV devices
Proxitronic - German company, English web pages NVD & cameras fitted with NVD
EL4 camera with electron multiplying CCD sensorRaso Rod & Rifle - carries ITT night vision devices with prices on the web-
Sagem - electro-optic technology
Seiler's Electro-Optical - day & night weapon sight with either straight tube or image intensifier
Sovietski Collection http://www.sovietski.com/ - I got the T3C-3 device ($143+). Although it is claimed to have a 13.7 deg. field of view, outside the center 5 deg it is very fuzzy on stars. The relative brightness of the stars is maintained so star hopping is easy. Since the tube looks like a capacitor, just a press of the trigger keeps the tube going for minutes. You do not need to hold it all the time. I have asked about the out of focus condition and the preliminary response is that this is normal. At the very center of the FOV there are sparkles but they are not objectionable. The number of stars that can be seen is greater in the center 5 deg. than what you would see in the Orion 9x63 binoculars. I think that the objective optics are not focusing on the tube causing the fuzziness. A good system would use an objective that was a 35 mm camera lens (i.e. it is designed for good focus over a diameter of about an inch.). This appears to have a tube with 1" input and 1/2" output. Since it is Russian it must be GEN2 or below.
Spy World -
STANO Components - Night Vision Systems - AN-PVS4 - modular system - SC/PVS-200 - uses 35mm camera lens ( included?) & c-mount output
Star Lazer -
Star-Tron Technology Corporation - 900 Freeport Road - Pittsburg, PA 15238 - comprehensive line of scope systems! - Chapter 11 -
Tasco - night vision -
Scientific CCD CamerasCamera Interface Guide by Matrox - talks about various standard & non-standard video formats
These cameras typically have square pixels and higher resolution that a TV format video camera. They typically use RS-170 Video format.
Graftek - software company thathandles cameras, frame grabbers, optics, etc.
Scientific - Industrial -Security CCD cameras - spreadsheetIf only the RS-170 (or CCIR) analog camera output is fed to the frame grabber then there can be a pixel of jitter due to timing variations. If a digital output camera is used the correspondence between each pixel and the data will always be the same, but for more money. I much lower cost way to lock the data to the pixel is to get an optional pixel clock output from the camera to sync the frame grabber.
If RS-170 format is used a S-VHS VCR will record hours of images with very high quality and allow freeze frame playback into the frame grabber, but without the pixel clock.
Direct recording of the frame grabber to the hard drive is possible using specialized video workstation computers. Optionally direct recording to computer RAM from the frame grabber is also possible, but with limited time capability. If the computer is fast enough it might be albe to extract the moving objects.
Frame GrabbersIn order to analyze the data from a staring video camera you need to be able to stream the video onto hard disk. The low resolution B&W images involved here should not tax the hard drive. For full color streaming video Ultra Wide SCSI drives are recommended. To get the required camera to RAM or Disk transfer speed most frame grabbers use the PCI buss with "bus mastering".
Pulnix - Frame Grabber Compatability chart -
Alacron - Basic FastFrame - includes some image processing right on the board
Data Translation - DT3152 $995 -DT3155 $695 -
D a t a c u b e - rejected because they require registration to see their on line data
Engineering Design Team - digital video frame grabbers, not analog
EPIX - 4MEG VIDEO Model 12 has on board 12 MIPS TMS320C25 DSP
Foresight Imaging (Imagraph) - I-25 -
Imaging Technology Incorporated - PCVision - $1250
Imperx - Frame Grabbers for laptops
Integral Technologies - FlashBus model MV Lite - used by Adirondack Video Astronomy - $395
Mikrotron - Inspecta-2 - 24 bit - Industrial Cameras -
MuTech - M-Vision 500 $500 -
Visicom - hi power FG & image processing
Ronald A. Massa Associates -
National Instruments - PCI-1407 - 8-bit RS-170 & CCIR Monochrome PCI buss frame grabber $695
PCI-1422 - 8,10,12,14,&16 bit RS-422 & analog inputs $1295 - both can stream video to disk
Snappy Video Frame Grabber - $100 -but can only capture a single frame to the PC
Snap Magic Frame Grabber - a single frame grabber
Matrox - Meteor-II Family is used by the Metor people and has software app support - Camera Interface by Manf - can stream video to disk
Video SoftwareCognitech - Video Investigator -
Low Light TV CamerasThis is a much more economical approach than image intensifiers. There are a number of ways that the light gathering capability of a TV camera can be made lower:
Note that there are two different images possible:
- Chip design
The PC104 camera runs a normal frame rates with good low light sensivity.
1004x board camera can be modified for astronomical use
- Stacking images - where the stacking is done after the observation
- Stacking images in the camera - like with the Mintron cameras - but this method is not suitable for fast moving satellites
- Satellite appears as a point of light which is the easiest and can be done using video or 35 mm camera lens on TV camera.
- Imaging the shape of a satellite which requires an astronomical scope and tracking mount, although some have been able to use non motorized mounts. After the observation each video frame is examined to find the ones where the seeing was good.
GOTO Equatorial MountThe relative accuracy of the mount needs to be matched to the FOV of a single pixel. For declination scanning the mount needs to support multiple scan rates in declination. The mount must be able to easily carry the OTA and camera while still providing very good tracking. Some people feel that the mount is THE most important part of a CCD imaging system. While compiling the spreadsheet below I found that the pointing accuracy, or whatever it's called, specification on mounts is not at all standardized and in many cases is not specified. That makes it difficult to tell which mount is giving the best performance for the money.
There are some web pages where an image of some satellites can be seen. In all of the other satellite viewing cases the satellite shows up as a point source of light with some brightness variation.
The Mead hand controllers can only be used for leap frog tracking, but the LX-200 (and a couple of mounts that have full LX-200 emulation) will also allow continuos tracking so that video imaging can be done usingSatTrack software.
Because of atmospheric "seeing" effects 99 out of 100 frames will be blurred. By searching the video tape frame by frame a good image may be found. Note that because of "seeing" you can NOT use a scope larger than 12" and that's the size used for the web imaged photos.
The newer Mead LX-200GPS scopes hae not yet been qualified with SatTrack (19 Aug 2002) but the older LX200 scopes will do continous tracking. Most all other socpes can only do leap frog tracking.
May 30, 2003 - the LX-200GPS still is not where it need to be in terms of firmware. Also the GPS can not update the computer clock with enough precision. Note that a satellite will pass through the FOV of an astronomical scope that has enough magnification to image the sat in a fraction of a second. If the computer clock is off by that fraction of a second then you will not see the sat.
Mounts HTML Spreadsheet with web links
Home Made MountsGerman Equatorial Mount Project -
precision machine from junk -
Amateur Telescope Makers (ATM) ARCHIVES -
Rob Hunt's ALT-AZ Page -
Idea - use car/truck axles, housing & center section & maybe add better bearings
Anssen Technologies - Mounts - AT4000 drive controler -
Sidereal Technology - controller for Pittman 8000 series DC Brush servo motors -
Ametek (Pittman, MAE) - Motors - AC Synchronous, DC Brush, DC Brushless, Stepper
SoftwareAs far as I know there is not any amateur software available for Satellite Orbit Determination (Search).
Bester Tracking Systems -Unix software SatTrack Version 4.1.6 - working on Orbit Determination software system
Earth Orbiting Satellite Tracking Capabilities using Steward Observatory's 90 and 61 Inch Telescopes - 3 people & 2 computers
Near Earth ObjectsAutomated Asteroid Search - T. Wesley = combines DC3 for LX-200 control, Cyanogen Productions MaxIm DL/CCD for CCd control & PinPoint Astrometry Engine for plate position analysis then micro jog the LX-200 for extremely precise pointing
BAO Schmidt CCD Asteroid Program (SCAP) -
NEO Search Programs - links to CCD automated telescope search programs
Catalina Sky Survey - classical Schmidt design with a 69 cm spherical f/1.78 mirror
Japanese Spaceguard Association (JSGA) - 1-meter telescope, whose field of view is 3 degrees . . . mosaic of 12 CCD detectors each one of which will have dimensions of 2096 x 4096 pixels
Lincoln Near-Earth Asteroid Research (LINEAR) - CCD cameras for finding comets
Lowell Observatory Near-Earth Object Search (LONEOS) -
Near-Earth Asteroid Tracking (NEAT) - classic 1.2-meter- diameter (48-inch) Oschin Schmidt telescope - photos -
OCA-DLR Asteroid Survey (ODAS) - 0.9 meter aperture Schmidt telescope, equipped with a 2096 x 2096 CCD
OH5IY - amateur radio & meteors + MS-Soft (Meteor shower Software) - Meteor Video Camera Project - Meteor Burst Communications The Gap Filler -
Sandia All-sky Camera Bolide Detection Network - Woodinville WA - hemishperical mirror & TV camera runs 24h x 7 days
Spacewatch 1.8-meter and 0.9-meter telescopes on Kitt Peak -
Minor Planet Mailing list -
Comets & MeteorsAnalysis of Video Meteors - Hardware requirements for video observations - Meteor Astronomy Links -
NASA Near Earth Objects - comets, asteroids, etc.
Computer-Aided Astronomy - comet and asteroid astrometry - CAA System Requirements - CCD Astrometry Freeware -
Chapter 5: Observing Technique - Radio -
International Meteor Organization (IMO) - Video Observation of Meteors - Image Intensifier & TV camera system - good articles - M O V I E -
Mount Allison Meteor Group -
R_Meteor - PC DSP radio detection
Spectrogram Downloads - just a PC based audio spectrograph
Northern Light (Auroras)FMI All-Sky Cameras - Image Intensifier & TV camera system
Variable StarsStarDial- CCD w/ 50mm-f2 camera lens drift scanning the night sky
TASS, The Amateur Sky Survey - looking for new variable stars with drift scan CCD cameras - typically a small field of view
Satellite SearchesFull-sky Astrometric Mapping Explorer (FAME) - The CCDs will be used in a time-delayed integration (TDI) mode to synchronize the charge transfer with the rotation of the spacecraft.
Hipparcos - Design - two photomultiplier tubes
Hubble Space Telescope -
AAVSO Network to Search for Optical Counterparts of Gamma-Ray Bursts - which are found with the BATSE (Burst and Transient Source experiment) instrument aboard the Compton Gamma Ray Observatory satellite - but they need CCD equipped telescopes to look for the after glow.
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