Study and realization of a trap pyroelectric detector for absolute high radiant powers and energies

We have built an electrically calibrated trap detector, based on a 9 µm thickness PVF2 pyroelectric material, for absolute high radiant powers and energies. The detector was designed as a transfer standard for measurements in the wavelength regions from 250 to about 2500 nm. Graphite black coating was deposited on the detector surface and was used as the optical absorber and the electrical heating element. In addition, the reflection losses, which were measured experimentally by using an integrating sphere, were about a few times 10 −4 . The uncertainty of the detector’s spatial-response uniformity variation was less than 0.5% across the 10 mm diameter aperture. The relative linearity measurements indicated a non-linearity of only a few times 10 −3 . The linearity range, obtained by electrical heating power, was from 20 mW to about 1 W and the detector sensitivity in this range was 6.361 V W −1 with an uncertainty 0.001 V W −1 (coverage factor, k = 1).