Measurement Error of Voltage Responsivity of Pyroelectric Detector Induced by Use of Non-Sinusoidal Modulation of Radiation

Abstract. For the experimental measurements of pyroelectric detectors voltage responsivity, sinusoidal modulated optical radiation should be used. In practice, optical choppers are commonly used in experimental set-ups to modulate optical source and as a result optical radiation may have a square or trapezoidal waveform. In the paper, the frequency dependence of voltage responsivity of pyroelectric detector for different shapes of waveform of absorbed radiation was studied by use either simulation and experimental method. Simulation studies were carried with the program MATLAB-Simulink and verified experimentally. The results of the studies indicated that the frequency responses of pyroelectric detector show considerable differences for different wave profiles of radiation excited detector.