A Fast and Sensitive Bolometer and Galvanometer System for an Infra‐Red Spectrometer

摘要

This bolometer and associated equipment, designed for use with a high speed recording infra‐red spectrophotometer, respond in two‐tenths of a second to 6×10-8 watt of radiation from a slit. Amplification of the Brownian limit of the Moll microgalvanometer in the presence of difficult vibrations is achieved by mounting the galvanometer, photo‐cells, and preamplifier on a novel support employing a large compression spring. The bolometer and amplifying system described were developed for use with an f4 rocksalt infra‐red spectrophotometer. In order to show the spectrum on the screen of a long‐persistence (one minute) oscilloscope, unusually rapid response was desired, even at the expense of some sensitivity.