manualshive.com logo in svg

Spectral Instruments Series 800, User Manual, Page: 29 / 70

Share
Download
Spectral Instruments Series 800 User Manual Download Page 29

Spectral Instruments 

 

Pt # 2500- 

29 

 

shows up with the brighter pixels on the side of the image away from the serial 
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 visible.  The test report lists the hot and dark columns on 
your sensor when it is operating at normal temperature. 

Summary of Contents for Series 800

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

Page 2: ...Spectral Instruments Pt 2500 2...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 20: ......

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 30: ......

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 40: ......

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 48: ...Spectral Instruments Pt 2500 48...

Page 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...

Page 50: ......

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

Page 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...

Reviews:

No comments