Pulse Shape Measurement Using Golay Detector

Abstract

The article discusses key physical processes within the active area of an optoacoustic detector. Said area is a xenon-filled chamber subdivided into two cavities connected by a narrow channel. Original mathematical model of such area is proposed on the basis of thermodynamic processes that occur within. A method has been developed to measure a shape of a periodic pulse exceeding 0.5 ms duration at repetition rates ranging from zero to several hundred Hz. The measurement requires knowledge of a set of parameters describing a specific instrument. Principal points of detector calibration are discussed in brief.

A Terahertz Optomechanical Detector Based on Metasurface and Bi-Material Micro-Cantilevers

“…The displacement of free ends can be read out by several methods and used to characterize the incident terahertz energy. Compared with traditional terahertz detectors, the optomechanical detector proposed in this paper can operate in a specialized frequency band with less response time and can also form big planar arrays to meet the requirements of FPA imaging systems, which is beyond the reach of the Golay cell, natural absorber-based bolometer and photoconductive antennas [ 25 , 26 , 27 ]. In this work, the displacement is measured by a specifically developed optical read-out system, which avoids the integration of complex read-out circuits and simplifies the design process while ensuring the correctness of test results.…”