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Getting Started Guide: Cobra OCT Spectrometers   

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Getting Started Guide: Cobra OCT spectrometers 

Introduction 

Your Cobra OCT  spectrometer is an essential component of a spectral-domain optical coherence 

tomography (SD-OCT) system. SD-OCT systems require spectral measurement of interferometric signals 

at very high-speeds. A Cobra spectrometer with its high sensitivity and high speed is ideally suited for this 

application. Cobra spectrometers receive light input via a single-mode fiber connected with an FC/PC 

connector. Dispersive optics in the spectrometer direct different frequencies or wavelengths to different 

pixels in the sensor. This provides spectral information about the input the light signal. The electrical 

output from camera is transferred to a personal computer using a camera link connection. 

Data Flow 

It is important to the make right choice of camera link card and software for your application. Cobra-S 

spectrometers have the ability to communicate directly with a personal computer via USB 3.0, but only at 

line rates of up to 130 kHz (option 1). All of our Cobra spectrometers can communicate with a personal 

computer using a Cameralink card and cable, including the Cobra-S at speeds of 250 kHz (option 2).  

 

Need help, a detailed manual for your specific camera sensor, or a new copy of your spectrometer’s 

system related files?  

Contact us

 

 

 

Содержание Cobra OCT

Страница 1: ...t frequencies or wavelengths to different pixels in the sensor This provides spectral information about the input the light signal The electrical output from camera is transferred to a personal computer using a camera link connection Data Flow It is important to the make right choice of camera link card and software for your application Cobra S spectrometers have the ability to communicate directl...

Страница 2: ...alled SDR Shrunk Delta Cables to the spectrometer Note in case the camera is being operated at a rate where medium or full camera link mode is used two camera link cables are required Step 4 Connect the larger end of camera link cable s called MDR Mini D Ribbon to the camera link card installed in your computer Step 5 If the camera is USB powered like the Cobra with a Wasatch internal camera conne...

Страница 3: ... for NI MAX to communicate to the camera e2v 2Taps icd Configuring the Camera to Work with NI Max The camera must first be configured to have the same settings as defined by the ICD file linked above To do this launch CommCamm and then follow the prompts for an autodetect If the device is powered and the cameralink cables are properly connected you will see an image similar to the following image ...

Страница 4: ...camera file we can now retrieve our data through National Instrument s Measurement and Automation Explorer NI MAX Launch NI MAX and navigate to the connected camera This will look similar to the image below Right click on the connected camera Channel 0 and load the supplied camera file by right clicking selecting Open Camera and then selecting the ICD file ...

Страница 5: ...Once done you can now select the Grab button above the image and will now see the test checkerboard pattern begin scrolling in the window similar to the image below You can now go back to CommCam to disable the test image and begin using your spectrometer ...

Страница 6: ...ch Photonics Specific Configuration Files The following files are required and are provided on an instrument specific configuration basis with your Cobra spectrometer COBRA_SensorsUnlimited_2048 ccf Look for the calibration information and configuration files for your particular instrument on the USB storage drive provided or contact us for product support with your device serial number if these f...

Страница 7: ...ly downloaded Cobra_ model name ccf file under configuration dropdown menu 3 Click the Grab button 4 Click the Graph icon at the far right of the icon bar then choose the line profile option to verify that the spectrometer is returning high gain data 5 The image to the right is the spectral output shown after clicking the Graph Icon ...

Страница 8: ...d and are provided on an instrument specific configuration basis with your Cobra spectrometer GL2048L 10A_icd0170rev6 icd Look for the calibration information and configuration files for your particular instrument on the USB storage drive provided or contact us for product support with your device serial number if these files are needed Measurement Automation Explorer 1 Copy the supplied GL2048L 1...

Страница 9: ...step 1 above the GL2048L 10A_icd0170rev6 icd file was copied to the NI IMAX icd file directory To select that file for usage in IMAX right click the Channel 0 entry Go to Camera Goodrich GL2048L rev6 file as shown in the image here Note that no serial configuration over camera link is required as SUI cameras come from the factory pre configured They will automatically read from the sensor and put ...

Страница 10: ...Getting Started Guide Cobra OCT Spectrometers Page 10 8 Open the TIF file in ImageJ select a line of data in the image click analyze plot profile and you should see something like the following ...

Страница 11: ... port with interleaved pixels Control of the spectrometer happens via the serial port on the Camera Link card The following parameter values should be used for the serial communications Baud Rate 9600 Parity None Data bits 8 Stop bits 1 For external triggering the CC1 line on the base Camera Link connector is used Triggering should use LVDS values compatible with the Camera Link interface with tri...

Страница 12: ... command can be sent without a parameter to read the current value This should only be set when the camera is NOT scanning i e after an lsc 0 command The integration time must be at least 2 microseconds less than the line time ltm Line Time Command ltm Response ok n Remarks Sets the line time in microseconds Valid range is 22 to 65 535 µs The ltm must be larger than the integration time This comma...

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