Opto-electronic method for spectral analysis

Abstract From the Canadian patent

An opto-electronic method for rapid accurate, spectral analysis of the reflectivity or transmissivity of samples is disclosed. A concave, holographic diffraction grating is oscillated at high speed to provide a rapid scanning of monochromatic light through a spectrum of wavelengths, The grating drive system is an electrically driven mechanical oscillator which utilizes the back EMF of the oscillator motor to maintain oscillation at the desired amplitude and frequency. A passive optical shutter mounted to the grating alternatively blocks the light entering and exiting the monochrometer as the grating is oscillated. The resultant dark period is utilized in the method to provide a reference …