Monolithic diffraction spectrometer

Details Monolithic diffraction spectrometer Monolithic diffraction spectrometer

1990-03-05

1991-06-04

Evans, F. L.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

35016223, 35016224, 357 30, G01J 318, G01J 336

Patent

active

050209108

ABSTRACT:
A monolithic diffraction spectrometer having a diffraction grating formed over a light sensing array is provided. The diffraction grating serves to diffract wavelengths of interest to an underlying photosensitive device while diffracting other wavelengths away from the photosensing element. By forming a diffraction grating with a variable pitch, or multiple diffraction gratings having various pitches, any number of specific light wavelengths can be detected with a high degree of precision. When a diffraction grating having a pitch which is in the order of the incident wavelength of light is used, improved sensitivity is achieved.

REFERENCES:
patent: 4746186 (1988-05-01), Nicia
patent: 4798464 (1989-01-01), Boostrom
patent: 4852079 (1989-07-01), Kinney et al.

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