National Instruments NI 1712 User Manual

Also see for NI 1712: User manual

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National Instruments NI 1712 User Manual Manual pdf 45 page image

© National Instruments | 5-15Image SensorThis chapter provides an overview of the NI Smart Camera image sensors, field of view, spectralresponse, partial scan mode, binning, gain, and hardware binarization. NI 1712/1732/1752Smart Cameras use a VGA sensor. The NI 1754 Smart Camera uses an SXGA sensor. Refer toAppendix A, Specifications, for information about the image sensors.Field of ViewThe field of view is the area under inspection that will be imaged by the NI 17xx Smart Camera.It is critical to ensure that the field of view of your system includes the object you want toinspect.To calculate the horizontal and vertical field of view (FOV) of your imaging system, useEquation 5-1 and the specifications for the image sensor of your device, as listed in Appendix A,Specifications.(5-1)where FOV is the field of view in either the horizontal or vertical direction,Pixel Pitch measures the distance between the centers of adjacent pixels ineither the horizontal or vertical direction1,Active Pixels is the number of pixels in either the horizontal or verticaldirection,Working Distance is the distance from the front element (external glass) ofthe lens to the object under inspection, andFocal Length measures how strongly a lens converges (focuses) or diverges(diffuses) light.1 Because NI 17xx Smart Camera sensors have square pixels, pixel pitch corresponds to the pixel size forthe appropriate sensor.FOV Pixel Pitch Active Pixels× Working Distance×Focal Length-----------------------------------------------------------------------------------------------------------------=