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Method and apparatus for simultaneously recording multiple FT-IR signals

  • US 4,511,986 A
  • Filed: 08/30/1982
  • Issued: 04/16/1985
  • Est. Priority Date: 08/30/1982
  • Status: Expired due to Fees
First Claim
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1. Apparatus for simultaneously recording, in a single beam Fourier Transform Infrared spectrometer, multiple signals defining at least two different interferograms comprising:

  • switching circuit means having at least two signal terminals, having a first and a second control circuit input terminal and having one output terminal;

    means for coupling input signals to said at least two signal terminals;

    sample-and-hold circuit means having an input terminal connected to the output terminal of said switching circuit means;

    analog-to-digital circuit means having an input terminal connected to said sample-and-hold circuit means and having an output terminal for delivering digital data;

    means for generating a first control signal for synchronizing said switching circuit means with an interferometer operation;

    means for generating a second control signal defining data acquisition intervals;

    means for coupling said first control signal to said first control circuit input terminal to reset said switching circuit means to a predetermined state;

    means for coupling said second control signal to said second control circuit input terminal to switch the state of said switching circuit means for each of said signals defining data acquisition intervals so that data samples for each of said input signals are interleaved;

    computing circuit means coupled to receive the digital data from the output terminal of said analog-to-digital circuit means, said computing circuit means being operable under program control to store said digital data, and for accessing said digital data so that all data samples for the same input signal are combined to produce an interferogram for each of the input signals.

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