Portable spectrophotometer

Details Portable spectrophotometer Portable spectrophotometer

G - Physics

01

J

G01J 3/20 (2006.01) G01N 21/47 (2006.01) G01N 21/55 (2006.01) G01J 3/50 (2006.01)

Patent

CA 2095261

PORTABLE SPECTROPHOTOMETER ABSTRACT OF THE DISCLOSURE A portable spectrophotometer includes a small-diameter optical sphere (101) as well as optical detectors (131, 136) and signal processing and display circuitry (140, 142) which allows the instrument to be taken to an object to be measured and which provides a readout of color values at the portable instrument. The instrument is capable of providing specular-included and specular-excluded color readings simultaneously. The interior of the integrating sphere is coated with a highly reflective, color- absorbing material, and light from an incandescent lamp (103) is diffused within the sphere prior to reaching the object to be measured. The sphere is provided with a first aperture (120) which receives spectrally-included light and which is positioned to absorb a spectral component of the diffused source light. A second aperture (125) positioned at a corresponding angular position with respect to the object measures specular-excluded light, excluding the specular component absorbed by the first aperture. By appropriately combining the specular-included and specular-excluded light at one wavelength, a value for the specular component is derived.

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