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spectrophone
spectrophone n.
Brit. 
/ˈspɛktrə(ʊ)fəʊn/
, /ˈspɛktrə(ʊ)fəʊn/U.S. /ˈspɛktrəˌfoʊn/
a device in which a body of gas may be caused to emit sound waves when illuminated by a periodically interrupted beam of electromagnetic radiation (usually visible or infra-red)./ˈspɛktrəˌfoʊn/ΘΚΠ
the world > matter > physics > science of sound > sound-waves > [noun] > emission of > device emitting
spectrophone1881
1881 A. G. Bell Sound by Radiant Energy 41 These substances are put in communication with the ear by means of a hearing-tube, and thus the instrument is converted into a veritable spectro~phone.
1948 Chem. Abstr. 42 1467 An app. was constructed for the detn. of gases absorbing in either the infrared or the visible region, on the principle of Bell's spectrophone.
1965 New Scientist 21 Oct. 199/3 The collisional phenomenon has recently been investigated..using a device named the ‘spectrophone’, in which a sample of gas is subjected to a sequence of pulses of infrared (140 a second) during which the molecules acquire vibrational energy. If they lose that energy by collision, the increase in molecular velocities, and therefore in pressure, is detected by a microphone in the gas, which accordingly registers a 140 c/s note.
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