Development of Spectrophones for CW and Pulsed Radiation Sources.

摘要

This technical report describes the construction of high sensitivity absorption measurement systems based on spectrophones (opto-acoustical cells) which have been developed for both CW and pulsed laser sources. These systems have been applied to measurements of absorption by atmospheric gases and particulates at IR laser frequencies. Construction, calibration, and linearity are discussed for a number of specific systems. Accurate measurements of absorption by atmospheric constituents in the so-called transmission 'window' frequency bands are required by both the DoD high-energy laser (HEL) and electro-optical sensor programs. Statistical predictions for system design and the development of real-time field measurement systems are both important possible applications of spectrophones of the type discussed in this report. High sensitivity is generally a requirement as a result of the relatively low absorption in the 'windows.' (Author)