Most older interferometers use analog video cameras that conform to the monochrome RS170 (60Hz) or CCIR (50Hz) broadcast standards. If you are upgrading an older interferometer, we recommend that you replace this video camera with a fully digital camera that connects directly to the computer via FireWire (1394), USB 3.0 or GigE.
You should expect to pay $700 or more for an industrial grade digital camera—about the same as for a video frame grabber. Consumer grade devices are mostly limited to color images and use lossy data compression.
|Make and Model
|Active Area (mm)||5.95×4.46||5.95×4.46||6.14×4.92|
|Pixel Pitch||4.65 µm||4.65 µm||4.8 µm|
|Pixel Depth||8 bit||8 bit||12 bit|
|Frame Rate (at max res)||15 fps||15 fps||95 fps|
|Housing (H×W×L mm)||50.6×50.6×50||50.6×50.6×50||29×29×43|
|Weight||265 g||265 g||65 g|
Your interferometer may have a second video camera used for alignment mode. Since alignment mode image quality is non-critical, we recommend keeping the video alignment camera and interfacing it to the computer with an inexpensive video-to-USB adapter.
Format_7 modes are custom and defined by the camera manufacturer and vary by camera model. Format_7 modes are typically characterized by region of interest (ROI) and/or pixel binning, although full resolution is for some cameras a Format_7 mode. Both techniques typically result in a faster frame rate. ROI is also known as sub-windowing. For some CCD sensors, ROI may increase the frame rate only if the number of rows is reduced. Pixel binning is typically 1×2 or 2×1 or 2×2 with 2×2 being of most interest because the others result in a distorted image.