Wavelength modulation derivative spectrometer

Details Wavelength modulation derivative spectrometer Wavelength modulation derivative spectrometer

1986-03-18

1988-06-21

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

331156, 331183, G01J 318

Patent

active

047521295

ABSTRACT:
Light to be measured is input to a diffraction grating after is has been oscillated by a wavelength modulation device with a constant frequency F. The light is incident to the diffraction grating at an angle of incidence, .theta., and is oscillated with a frequency F with a center angle of incidence, .theta..sub.0, as a center. An output spectrum of said diffraction grating is received by a photoelectric converter. An electric signal from the photoelectric converter is oscillated with a frequency F over a wavelength range of .lambda..sub.0 .+-..DELTA..lambda. where .lambda..sub.0 is a center wavelength measured at the center angle of incidence .theta..sub.0. The oscillated spectrum signal is synchronously detected, by a synchronous detector, with a frequency 2F through a high-pass filter, obtaining a variation spectrum at the measured center wavelength .lambda..sub.0. The output electric signal of the photoelectric converter passes through a DC amplifier to a sampling circuit where it is sampled with the frequency F or 2F. In this way it is possible to obtain a full intensity of a spectrum at the center wavelength .lambda..sub.0. The driving of a wavelength scanning mechanism causes a variation in the incident angle .theta..sub.0 of the light to the diffraction grating and thus a variation in the center wavelength .lambda..sub.0 measured.

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