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Wedge-filter spectrometer

  • US 4,957,371 A
  • Filed: 12/11/1987
  • Issued: 09/18/1990
  • Est. Priority Date: 12/11/1987
  • Status: Expired due to Term
First Claim
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1. A wedge-filter spectrometer comprising:

  • means for spectrally dispersing an incident radiation beam, said dispersing means comprising a first plurality of layers of high (H) index of refraction material and a second plurality of layers of low (L) index of refraction material, individual ones of said H and said L layers overlying one another in a given sequence
    
    
    space="preserve" listing-type="equation">H LL HLHLHL HH LHLHLH LL HL each of said H and said L layers having a substantially linearly tapered thickness of substantially constant slope, said layers HH being a spacer layer having a predetermined thickness for defining a passband, the thickness being substantially equal to a length associated with a number of whole wavelengths that evenly fit within the thickness of said spacer layer; and

    means, optically coupled to said dispersing means, for detecting at a plurality of points within a two-dimensional area a spectrally dispersed radiation beam, the radiation beam being spectrally dispersed by said H and said L layers.

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