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

Abstract

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).

Theoretical and experimental study of power radiometric measurements using a pyroelectric current integrator converter

“…3, 6(a and b)). • The frequency response of the used electrical circuit (converter) was calculated and experimentally verified [7,8]. Its bandwidth is 0.8 MHz.…”

“…Two film thicknesses have been used: 9 m and 25 m. The two faces of the pyroelectric film are covered with a thin aluminium layer which thickness is about 3 m. This layer constitutes the electrodes for recovering the pyroelectric signal. A graphite black layer is deposited on the front face of the detector to absorb radiation [7,8].…”

“…The equivalent thermal model is given in Fig. 2; where Φ(t) is the incident flux and I p (t) is the pyroelectric current given by the following expression [7,8]:…”

IR characterization of graphite black-coating for cryogenic detectors

“…This study served us to build an electrically pyroelectric detector and therefore a national radiometric scale from the UV-visible to the near infrared wavelength ranges using available graphite-black coating [15]. In present case, reflectance measurements made on graphite and matt coatings, were performed by Fourier Transform InfraRed (FTIR) spectrometer system with hemispherical collection optics.…”

Stability Study of the Metrological Characteristics of a ZnO/PS/C-Si Photodiode (PSiZ) Used as a Transfer

“…This structure made it possible on the one hand to increase the absorption of the incident radiation in the porous structure thus increasing the spectral sensitivity of the photodiode and on the other hand, to reduce the reflection coefficient of the photodiode front face to 7% approximately and this in a spectral field between 400 nm and 800 nm. In order to be able to use this photonic structure as a Tunisian Transfer Standard for optical power measurement in the visible spectral range, we had indirectly calibrated it, in 2006, against the cryogenic radiometer of the National Institute of Metrology-France (INM-France) [6].…”