A division of   

PR-1530AR NviSpot™

Location: Products > Light Measurement > Photometers > PR-1530AR
Light Measurement



Night vision Radiometer/Photometer/Colourimeter

The NviSpot Night Vision Radiometer/Photometer/Colourimeter is a multipurpose instrument designed to meet the NVIS radiance light measurement compatibility requirements of MIL-L-85762 for NVIS applications, and also perform the conventional fast and accurate luminance and colourimetric light measurements long associated with the PR-1500 SpotMeter

It consists of a modified Pritchard-type filtered photometer system with interchangeable objective lenses and an internal calibration source. For NVIS measurements it includes a proprietary filtered, extended-red gallium arsenide photomultiplier tube with overload protection, threshold detection and an NVIS-compatible digital display readout. Although the NVISpot does not replace the requirement for a laboratory-grade spectro-radiometer specified in the MIL Spec, it does provide a relatively inexpensive and highly accurate means of light measurement for all phases of production and control testing.

NVIS radiance mode

For the Aviators Night Vision Imaging System (NVIS) applications, the PR-1530AR includes a special filter/detector combination whose transmission curve precisely matches the NVIS relative response in MIL-L-85762.

When operated in the NVIS Mode, the NviSpot display reads out in NVIS Radiance (NRa or NRb) units. Relative colourimetric filters are optionally available for evaluating the colour of the device under test, i.e., Green A, Green B, Yellow and Red.

The digital display of the PR-1530ARis specifically NVIS-filtered to eliminate any inaccuracy it's own light output might introduce into the test results.

A very useful feature in the NVIS mode is the user adjustable threshold detection. An audible tone is generated when the display reading exceeds the maximum value of NR units set by the user for the device and/or test. This feature enables the PR-1530AR to be used as a rapid GO/NO-GO test instrument for on-line inspection of a series of devices that share a common NR upper limit, for instance 1.7 x10-10 NR units. An optional fiber optic probe, the LP-15, further enhances the GO/NO-GO testing feature.

The calibration accuracy required by the MIL-L-85762 us assured through the inclusion of an extremely stable internal reference standard. Correct calibration can be instantly verified at any time without the need for any external calibration sources or relying upon some vague factory calibration. And to prevent the accidental damage to the sensitive photodetector, a resettable automatic overload protection circuit has been designed into the PR-1530AR.

Lens accessories are available to modify the field coverage of the PR-1530AR over the entire range of devices likely to be measured for NVIS requirements. A uniquely shaped fiber optic probe, the LP-15, is available for measurements best suited to its field coverage capabilities. Analog output is included, and a BCD output is optionally available to permit interfacing to a host computer or data-logger.

Luminance/Colourimeter modes

While the NviSpot is designed primarily for measurements relating to MIL-L-85762, it also functions as an extremely sensitive luminance and colourimetric measuring instrument. In this mode it acts as a high performance PR-1500 SpotMeter. Many of the standard PR-1500 accessories can be used with the NviSpot to extend its versatility to include the features currently available with the PR-1500 SpotMeter.

Features