(n) :
(physics) An instrument that is used to investigate the vibration of polyatomic gases by measuring pressure vibrations in the gas upon radiation with infrared light
(n) :
An instrument constructed on the principle of the photophone and used in spectrum analysis as an adjunct to the spectroscope.
(n) :
(physics) An instrument that is used to investigate the vibration of polyatomic gases by measuring pressure vibrations in the gas upon radiation with infrared light
(n) :
An instrument constructed on the principle of the photophone and used in spectrum analysis as an adjunct to the spectroscope.