SPT-R-TRAP, SPT-AR-TRAP, SPT-DR TRAP: Pyroelectric TRAP Radiometer Probes

Precise, Spectrally flat, Power Calibration Transfer Standards

These NEW analog and digital Pyroelectric TRAP Radiometers set the standard for low uncertainty power measurements of lasers, lamps and low temperture black body sources. They are also ideal, when mated to an IR monochromator, for spectral calibration of IR detectors from 0.2 to 20 µm.

Their unique design is based on the “wedge” TRAP concepts pioneered at NIST Boulder where they are used as Spectral Calibration Transfer standards. The Pyro TRAP consists of a large area Black Pyroelectric Detector opposite a large area broadband mirror in a 15 degree wedge configuration (see the optical schematic below). The wedge configuration is designed so that 99% of the light passing through the 5 mm aperture is absorbed and measured. This means the spectral response from 0.25 to 13 &mirco;m is flat to 1% or better. It’s useful spectral range is from 0.2 to 1000 µm.

We offer three Pyroelectric TRAP Radiometer models as described below:

Model SPT-R-TRAP is a passive Pyro TRAP that is calibrated in µA/W and is designed for use with a low noise preamp and lock in amplifier or oscilloscope.

Model SPT-AR-TRAP is based on the SPI-A Analog Radiometer where we’ve replaced the single Black Pyro element with our Wedge TRAP and mated it to our low noise current mode electronics. We suggest you use this product with your standard Digital Oscilloscope or Lock In Amplifier.

Model SPT-DR-TRAP is based on the SPI-D Digital USB Radiometer where it’s mated to our digital electronics module. Measurement ranges are from 20 µW to 200 mW FS. Minimum resolution is 50 nW. Convenient LabView Applications Software and LabView Drivers make this Digital TRAP Radiometer incredibly useful in the lab. It can be set-up in a single or dual channel configuration.