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System and method for characterizing a sample by low-frequency spectra

  • US 20050030016A1
  • Filed: 08/20/2004
  • Published: 02/10/2005
  • Est. Priority Date: 03/29/2002
  • Status: Active Grant
First Claim
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1. Apparatus for interrogating a sample that exhibits molecular rotation, comprising:

  • a container adapted for receiving the sample, the container having both magnetic and electromagnetic shielding;

    a source of noise for injection into the sample, with the sample in the container;

    a detector for detecting an electromagnetic time-domain signal composed of sample source radiation superimposed on the injected Gaussian noise;

    a storage device for storing the time-domain signal and a second time-domain signal separately detected from the same or a similar sample; and

    an electronic computer which is adapted to receive the stored signal from the storage device, and to process the signal by;

    (i) cross correlating the time-domain signal detected with the second time-domain signal, to produce a frequency-domain spectrum in a frequency range within DC to 50 KHz, and (ii) generating an output that includes information relating to spectral components in the spectrum that are characteristic of the sample.

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