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Method of spectral nondestructive evaluation

  • US 6,184,528 B1
  • Filed: 08/27/1998
  • Issued: 02/06/2001
  • Est. Priority Date: 08/27/1998
  • Status: Expired due to Fees
First Claim
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1. A spectral nondestructive method for evaluating substrate surface characteristics of a sample substrate having a sample substrate surface and a generally visually nontransmissive sample coating disposed on the sample substrate surface, the sample coating being transmissive within a first infrared spectral wavelength range, the sample substrate being reflective within the first infrared spectral wavelength range, the method comprising the steps of:

  • (a) directing infrared radiation having a wavelength within the first infrared spectral wavelength range from an infrared radiation source towards the coated sample substrate through the sample coating disposed thereon;

    (b) collecting specular and diffuse infrared radiation reflected from the coated sample substrate through the sample coating disposed thereon;

    (c) measuring the reflected radiation as a function of wavelength in the first infrared spectral wavelength range to obtain measured reflectance data representative of the reflectance of the coated sample substrate;

    (d) comparing the measured reflectance data to reference reflectance data representative of a sample substrate surface having a known physical characteristic within the first wavelength range to obtain differential data; and

    (e) correlating the differential data to physical characteristics of the sample substrate surface.

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