High sensitivity acousto-optic tunable filter spectrometer

Details High sensitivity acousto-optic tunable filter spectrometer High sensitivity acousto-optic tunable filter spectrometer

1990-03-16

1992-06-09

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250343, 356 51, 359285, G02F 111, G01N 2902, G01N 2100

Patent

active

051209616

ABSTRACT:
An acousto-optical filter (AOTF) is used in a spectrometer for analysis of samples. The spectrometer provides continuous wave RF excitation through the crystal, and the spectrometer provides control and modulation for said RF source. The signal to noise ratio is improved by use of a lock-in amplifier which demodulates the modulation frequency. Fiber optics are used to connect the crystal to the source, and the source to the detection system. A digital lock-in amplifier is designed which increases the efficiency, accuracy, sensitivity and decreases the cost of conventional analog lock-in amplifier.

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