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Hadamard filter design

  • US 4,007,989 A
  • Filed: 09/29/1975
  • Issued: 02/15/1977
  • Est. Priority Date: 09/29/1975
  • Status: Expired due to Term
First Claim
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1. In a Hadamard transform spectrometer having a dispersive element arranged to disperse an elongated beam of spectral energy to be analyzed, the combination comprising:

  • a lens array disposed in the path of the dispersed beam and having a plurality of lens rows corresponding in number to at least the number of spectral elements to be analyzed, each row receiving spectral energy dispersed over a bandwidth containing such spectral elements, said array further comprising opaque means on said array providing a Hadamard mask in each lens'"'"' row,and a photodiode array comprising a plurality of linear photodiode means corresponding to the number of lens'"'"' rows, said diode array being juxtaposed to said lens array whereby each lens'"'"' row directs the spectral energy incident thereon onto a different one of said photodiode means.

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