ASP-SP503U-1550 Phosphor Coated NIR Cameras
- 1440-1605 nm Wavelengths
- NIR Telecom mode field analysis
- NIR Laser beam analysis
- Software included
- Discontinued - Replace by: ASP-BGS-USB-SP907-1550-OSI
Low Cost NIR Camera Technology
ASP 503U-1550 series, phosphor coated CCD cameras, provide a new low cost alternative for measuring and viewing the output of NIR telecom devices and NIR lasers. The thin phosphor film coating is an anti-Stokes material that up-converts NIR radiation in the 1440nm to 1605nm range to visible light measurable by the CCD.
Phosphor Coating Technology
The up-conversion from NIR to visible light in the 1550 series cameras is nonlinear. The anti-Stokes phosphor coating produces visible photons at a rate roughly the square of the input signal. This is shown dramatically in Figure 1, where the camera total output increases dramatically faster than a linear output shown in the bottom line.
The anti-Stokes up-conversion efficiency is very wavelength dependent. Figure 3 shows the typical spectral response curve of a new, high response coating. As seen, we have calibrated the response from 1527nm to 1605nm. We have extrapolated the shorter wavelength region by comparing our measured response to data published over the entire range. The significance of this non-linearity is that from the CCD camera saturation in the center of a beam, the up-converted visible signal drops as the square of the input signal. Thus the lower signal wings of a beam are suppressed, resulting in the appearance and measurement of a beam width much smaller than actual.
|Application||Nir Wavelenghts, 1/2" format, low resolution|
|Spectral Response||1440 - 1605nm|
|Maximum beam size||6.3mm W x 4.7mm H|
|Pixel Spacing||9.9µm x 9.9µm|
|Number of effective pixels||640 x 480|
|Minimum system dynamic range||~30dB|
|Linearity with Power||±5%|
|Accuracy of beam width||±5% for beams larger than 0.6mm|
|Frame rates in 12 bits mode||30 fps at full resolution 60 fps at 320 x 240|
|Shutter duration||30µs to multiple frame times|
|Gain control||43:1 manual|
|Trigger||Supports both Trigger In and Strobe Out|
|Photodiode trigger||Consult factory|
|Saturation intensity||7mW/cm2 at 1550 nm|
|Lowest measurable signal||~50µW/cm2|
|Damage treshold||50W/cm2/0.1J/cm2 with all filters installed for|
|Dimensions and CCD recess||89mm x 89mm x 28mm CCD recess: 4.5mm below surface|
|Operation mode||Interline transfer progressive scan CCD|
|PC interface||USB 2.0
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