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Non-invasive reflectance spectrophotometric apparatus

  • US 4,624,572 A
  • Filed: 03/21/1984
  • Issued: 11/25/1986
  • Est. Priority Date: 02/05/1982
  • Status: Expired due to Fees
First Claim
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1. Apparatus for detecting spectrophotometric characteristics of a specimen, comprising;

  • a portable housing;

    a light source for emitting radiation and mounted within said housing;

    means for producing monochromatic light from said emitted radiation;

    means for transmitting said monochromatic light to irradiate said specimen therewith; and

    photosensitive detector means responsive to the monochromatic light reflected from said specimen to provide output signals representative of the spectrophotometric characteristics of said specimen, and including light responsive means responsive to said reflected light and having an impedance characteristic variable in response thereto, a bridge circuit having a first arm including a first solid state device responsive to said variable impedance characteristic to generate a first amplified output, signal representative of said spectrophotometric characteristics, a second solid state device connected in a second arm of said bridge and responsive to said first amplified output signal to produce a second output signal representative thereof, means connected in a third arm of said bridge for calibrating said bridge and connected to said first solid state device, resistance means connected in the fourth arm of said bridge and connected to said second solid state device, whereby said second output signal represents the spectrophotometric characteristics of said specimen.

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