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Golay cell
The Golay cell is a type of opto-acoustic detector mainly used for infrared spectroscopy. It consists of a gas-filled enclosure with an infrared absorbing material and a flexible diaphragm or membrane. When infrared radiation is absorbed, it heats the gas, causing it to expand. The resulting increase in pressure deforms the membrane. Light reflected off the membrane is detected by a photodiode, and motion of the membrane produces a change in the signal on the photodiode. The concept was originally described by Marcel J. E. Golay,[2] after whom it came to be named.
The Golay cell has high sensitivity and a flat response over a very broad range of frequencies. The response time is modest, of order 10 ms. The detector performance is degraded in the presence of mechanical vibrations.
References
D. Klocke, A. Schmitz, H. Soltner, H. Bousack and H. Schmitz, "Infrared receptors in pyrophilous ('fire loving') insects as model for new un-cooled infrared sensors," Beilstein Journal of Nanotechnology 2, 186 (2011), doi:10.3762/bjnano.2.22
M. J. E. Golay, "Theoretical consideration in heat and infra‐red detection, with particular reference to the pneumatic detector," Review of Scientific Instruments 18, 347 (1947), doi:10.1063/1.1740948
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