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Spectrometer with direct drive high speed oscillating grating

  • US 4,969,739 A
  • Filed: 01/09/1989
  • Issued: 11/13/1990
  • Est. Priority Date: 01/09/1989
  • Status: Expired due to Term
First Claim
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1. An optical instrument comprising an optical grating mounted for oscillating, means to illuminate said grating with light radiation to cause said radiation to disperse said radiation into a spectrum, means to receive a narrow bandwidth of the spectrum dispersed by said grating, a motor having its rotor fixed to said grating so that said rotor and said grating rotate as one piece, and motor control means to energize said motor to oscillate said rotor between limits to thereby oscillate said grating and scan the narrow wavelength band to be received by said receiving means through said spectrum, said motor control means energizing said motor with a first polarity of electrical energy to positively drive said motor in one direction between said limits in the oscillation of said motor and energizing said motor with a second polarity of electrical energization to positively drive said rotor in the opposite direction between said limits in said oscillation.

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