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Spectral Instruments Series 800 Скачать руководство пользователя страница 66

Spectral Instruments 

 

Pt # 2500- 

66 

 

Increasing the integration time changes the sensitivity of the camera independent of the 
attenuation.  Longer DSI values slow down the readout (changing the attenuation does 
not slow down the readout) and decreases the sensitivity number.   

 

 

Table C1., below, tabulates a selected set of DSI settings and the effective pixel 
read time and the equivalent readout rate for typical S800 SICCD cameras. 
 

DSI Sample Time 
Parameter 

Pixel Read Time In 
Microseconds 

Pixel Readout 
Rate In Kilohertz 

7 1.0 

1000 

47 2.0 500 

 

87 4.0 250 

 

247 10.0 100 

 

 

Table C1. 

 

The DSI Sample Time values given above to achieve a particular readout rate are 
different for different CCDs and for different A/D converters.  The above values 
are only representative of the range of numbers you might expect to see in a .set 
file for your camera to select different read rates. 

Содержание Series 800

Страница 1: ...Series 800 Camera System User s Manual P N 2500 2002 Spectral Instruments Inc TUCSON ARIZONA...

Страница 2: ...Spectral Instruments Pt 2500 2...

Страница 3: ...ence 16 1 3 3 Externally Supplied Power 17 1 4 The S800 Camera Cable Set 17 1 4 1 Camera To Computer 17 1 4 2 Shutter Connector 17 1 4 3 The Auxiliary Port 18 1 5 The Cooling System 18 1 5 1 System De...

Страница 4: ...r Image Solution 35 4 2 1 Master Bias Images 35 4 2 2 Master Dark Images 35 4 2 3 Master Flat Images 36 4 3 Correcting Images 37 4 3 1 Why Correct At All 37 4 3 2 How 38 4 3 3 Limitations On The Flat...

Страница 5: ...re 51 7 2 2 Humidity 51 7 2 3 Altitude 51 7 2 4 Vibration 51 7 2 5 Aggressive Vapors 52 7 3 Warnings 52 7 3 1 Electrical System 52 7 3 2 Camera Head 52 7 3 3 Opening The System 52 7 3 4 Refreshing The...

Страница 6: ...arameters 61 Multi Port CCD Image Pixel Data Format 61 Single Port CCD Image Orientation 61 Over Scan in Multi Port CCD Readout 62 APPENDIX C 65 Sensitivity And Attenuation 65 Dual Slope Integrator Se...

Страница 7: ...using a thermoelectric cooler This camera system can read out at up to 1 000 000 pixels per second from each port for multi port CCDs It reads out at up to 4 000 000 pixels per second as a single port...

Страница 8: ...are available because of the popularity of this type of sensor for low cost digital imaging cameras Most of these CCDs are not scientific grade Moreover they are operated so as to give you a TV image...

Страница 9: ...orts four port readout so there are two serial registers labeled SR1 and SR2 Each serial register is divided into two halves which is shown figuratively as a black line in the parallel register The pa...

Страница 10: ...ge obtained with no external light coming through the normal path provides a view of how much light is coming from extra normal paths This camera can see light leaks very well To realize the full pote...

Страница 11: ...Spectral Instruments Pt 2500 11 second If a multi output CCD is used the rate per output port is appropriately lower Figure 3 Figure 4...

Страница 12: ...e in conjunction with an external event through the trigger input signal across pins 3 and 4 of the 4 pin Lemo connector labeled AUX The signal can either be a TTL switch closure or an Opto isolated v...

Страница 13: ...CCDs that are not connected to a fiber optic The cold end of the TEC is inside the camera head vacuum chamber The amount of current flowing to the CCD is regulated to maintain the CCD at the operatin...

Страница 14: ...the two options The copper wire AIA connection transfers image data down the AIA cable as 16 bit parallel pixel values over differentially driven lines The communication signal is RS422 bi directiona...

Страница 15: ...to obtain images upon external signal This is known as triggered mode In this mode the camera is programmed to clear charge continuously with the CCD staring into the application waiting for a trigger...

Страница 16: ...e of the window is also cleaned and the camera is shipped with a protective cover to keep the window clean Life conspires to change that Dust particles collect on the outside of the window Only those...

Страница 17: ...the camera head and mounted according to the requirements of the application 1 4 The S800 Camera Cable Set 1 4 1 Camera To Computer The camera communicates with the computer either by a copper wire 5...

Страница 18: ...s determined by the size of the CCD the presence of a fiber optic attachment or the distance between the CCD and the window The operating load is very much affected by the pressure inside of the camer...

Страница 19: ...ing with the stabilization temperature requested to be colder than the TEC can provide the temperature of the CCD will lower to an initial minimum and then rise again to the open loop temperature This...

Страница 20: ......

Страница 21: ...is borne by the carrier 2 1 2 Opening The Cartons Open the cartons in such a manner that they can be reused It is important to use these or equivalent packing materials if the camera system is to be t...

Страница 22: ...nst handling damage 2 3 2 Assembly Of The Camera Power Supply The AC power setting must be verified or set to the proper configuration before power is applied to the camera The power entry module has...

Страница 23: ...ction when the unit is reassembled Once the dot is opposite the power label you selected replace the circuit board assembly 4 Insert the fuse holder module and inspect the power setting now indicated...

Страница 24: ...image data as floating point pixel values which means that image data are 32 bits 4 bytes per pixel The data can be stored under any of several file storage formats It is important to select a file s...

Страница 25: ...ts for transmission of requisite number of bytes The parameter s is are not echoed The camera waits for the number of bytes that are expected for the command so it is important that every command that...

Страница 26: ...is slow and the camera is warm This thermal signal introduces a ramp effect from one side of the bias image to the other Referring to Figure 7 the thermal signal is uniform along rows and increases al...

Страница 27: ...image overlaying the image Figure 7 Camera Image Showing Overscan The serial register is on the left hand side of the image The first pixel read is displayed at the lower left hand corner and the read...

Страница 28: ...es show dark signal This signal is flat because all of the parallel overscan rows are exposed to dark charge for some time exactly the same time while passing over the active area during readout which...

Страница 29: ...register Some number of very bright spots may be visible Most of these are pixels that generate an excess of dark signal compared to the average they are hot pixels Any hot column defects are also vi...

Страница 30: ......

Страница 31: ...dark signal With that said a 100 second dark image shows a structure similar to the bias although the background will be higher depending upon the CCD and the temperature of the camera The cold CCD da...

Страница 32: ...from a region on the parallel register of the sensor that does not include any hot columns Obtain a bias image at the same readout rate and attenuation settings and determine the mean value from the...

Страница 33: ...ure in a bias image is typically due to transients that occur in SICCD type cameras when a new row or column starts to be read out These transients are small but the precision with which the camera el...

Страница 34: ...related to inhomogeneities in the sensor or in the substrate upon which it is built The variation to be expected the dark signal non uniformity DSNU can be as high as 25 for some CCDs It is rarely les...

Страница 35: ...re corrector than a fresh off the camera bias with standard readout noise It is possible to use this master bias with small incremental dc offsets to correct for changes in the dc bias with time The e...

Страница 36: ...ecorded somewhere Hot pixels must be discarded at some point A decision must be made as to what constitutes a pixel so hot that it must be discarded That determination is strongly a function of the ap...

Страница 37: ...by the ratio of the exposure time of the master flat image to the exposure time of the master dark image Subtract the result from the master flat image The result is a fully corrected master flat imag...

Страница 38: ...er flat from which you got a scaling parameter You are ready to proceed to correct a target image Bring up the target image and subtract the master bias Multiply the master dark by the ratio of the ex...

Страница 39: ...provided it is large enough It does not say that the magnitude of the pixel values is now correct Provided that the master flat image is exposed so that it is about half of the full range of the ADC...

Страница 40: ......

Страница 41: ...ply unit and it is highly likely that the user could exacerbate a problem by attempting to open something up Spectral cameras are assembled in an anti static clean room to insure the safety of the CCD...

Страница 42: ...Pressure A S800 camera head includes a sensor that measures the pressure inside the camera head This sensor operates over a pressure range from 10 4 torr to about 10 torr A facility is provided within...

Страница 43: ...t mist filter 1 QF10 16 ASRV Kurt J Lesker Adaptive centering ring 3 QF16 075 SRV Kurt J Lesker centering ring 3 QF16 075 C Kurt J Lesker Aluminum clamp 1 QF16XFNPT4 Kurt J Lesker Female Pipe Adapter...

Страница 44: ...age source Baking the micromaze filter on the pump with the pump running and the hose end sealed is the recommended process in order to most rapidly exhaust the water vapor Note that the controlled le...

Страница 45: ...e alignment of the camera to the application If the camera is mounted into the application so that the vacuum port is accessible then it is only necessary to warm up the camera to room temperature in...

Страница 46: ...nts Customer Service for assistance on how to proceed if the vacuum refresh process failed 5 6 Cleaning The Window Cleaning the window is not a recommended practice as it is hard to make the window be...

Страница 47: ...Set up the high intensity light probe so that a grazing incident beam can be directed at the window Turn on the high intensity light and critically examine the front of the window by shining the light...

Страница 48: ...Spectral Instruments Pt 2500 48...

Страница 49: ...2 6 2 The PDCI Card The PDCI card is Part 1527 for a copper wire cable interface module or Part 2495 for a fiber optic interfaced camera There are no switches or settings that need to be set up for a...

Страница 50: ......

Страница 51: ...n 7 2 2 Humidity The operating humidity range for the camera system is 10 R H to 60 R H The non operating humidity range for the camera system is 5 to 95 It is a requirement that the camera not be ope...

Страница 52: ...amera Head Never disconnect the power cable between the camera head and the camera power supply unit while the latter is powered on This power cable delivers operating voltages to all of the static an...

Страница 53: ...are open A fuse can fail without something else having failed but this is not the normal situation If replacing a fuse results in another blown fuse the problem is most likely a power supply failure...

Страница 54: ...ctronics are working If the image is still very flat without any gradients or bright spots then the CCD is truly not providing image data This means that the camera must be returned for service If a n...

Страница 55: ...lly from the application equipment If the streaks are still visible ground loops are eliminated and something has changed in the camera head which must be returned for service If the streaks go away t...

Страница 56: ...verscan and the image area If there is light is leaking into the dark environment Eliminate the light leak and see if things improve If the illuminated pixels are equivalent to the dark overscan pixel...

Страница 57: ...is time to pump the camera If the dark is very much too high it is possible that the CCD has become separated from the cold block where the temperature is measured To determine if this is the case and...

Страница 58: ...ay the CCD mask set is designed Table A1 below compiles the various image components for several different CCDs read out with overscan To make overscan work the following two steps are required 1 Set...

Страница 59: ...umns in the parallel register The extra pixels in the serial register are typically called pre scan and post scan However this terminology often includes the dark masked pixels which are actually on t...

Страница 60: ...allel Over Scan Serial Readout Dimension Serial Pre ext Serial Pre Mask Serial Illumin ated Pixels Serial Register Post Mask Serial register Post Ext TK1024 1050 0 1024 26 1120 48 2 1024 2 48 SI003 10...

Страница 61: ...ng the serial and parallel registers coupled with the two parameters that control the phasing allow pixels to be routed rather arbitrarily The exception is that one cannot read out 2 port through the...

Страница 62: ...milarly when single port readout is selected the parallel register shifts toward the A B side labeled SR1 in Figure B1 below When the parallel phasing parameter is set to 1 the parallel register rever...

Страница 63: ...D Readout Format Serial Phasing Serial Split Action 0 0 Shift to A and C outputs 1 0 Shift to B and D outputs 0 1 Split both serial registers and shift to all four output amplifiers 1 1 Invalid Charge...

Страница 64: ...el Phasing Parallel Split Action 0 0 Shift to A B outputs depends upon serial split 1 0 Shift to C D outputs depends upon serial split 0 1 Split and shift to A B and C D outputs 1 1 Invalid Charge shi...

Страница 65: ...images with the same camera SI cameras offer two software selectable attenuation levels which can be invoked in order to decrease the sensitivity of the camera and thus digitize higher signal level i...

Страница 66: ...e effective pixel read time and the equivalent readout rate for typical S800 SICCD cameras DSI Sample Time Parameter Pixel Read Time In Microseconds Pixel Readout Rate In Kilohertz 7 1 0 1000 47 2 0 5...

Страница 67: ...Pressure in Torr Reading From Camera Pressure in Torr 169 0 00 1621 1 00 266 0 01 1957 2 00 481 0 05 2126 3 00 654 0 10 2233 4 00 878 0 20 2304 5 00 1048 0 30 2356 6 00 1176 0 40 2395 7 00 1281 0 50 2...

Страница 68: ...camera cover and locate the two jumper pin arrays labeled JP4 and JP5 on the clock card shown in figure E2 below They are both located near the LEMO connectors Printed on the PWB next to the JP4 line...

Страница 69: ...Spectral Instruments Pt 2500 69 Figure E1 Figure E2...

Страница 70: ...TEC voltage depends upon the particular TEC installed and that is driven by the load on the CCD The DC power other than the TEC must be ripple free to 0 01 rms Cable Pin Number Voltage Amperage 1 15vd...

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