Standard for spectral reflectance

Details Standard for spectral reflectance Standard for spectral reflectance

G - Physics

01

N

340/155.2, 73/0.

G01N 21/01 (2006.01) G01N 21/47 (2006.01)

Patent

CA 1037281

ABSTRACT A standard for spectral reflectance for use in near infrared reflectance measurements of constituents of samples, which constituents comprise oil, moisture and protein. The standard reflects electromagnetic radiation in the wavelength range of 1.0- 2.5 micrometers and exhibits its best optical characteristics in the operational range of 1.4-2.4 micrometers. Still another object is to provide such a standard to retain the above-mentioned reflective properties after repeated, routine cleansing procedures consisting of soft-fiber brushing, cloth wiping, organic solvent washing, soap and detergent washing, and rinsing. Further, there is provided a standard for reflectance having a reflective surface which is opaque, nonporous, non- permeable to moisture, resistant to chemicals in which it comes in contact in use, and has a high density. Such a standard may be formed of a fired ceramic material of the type having these proper- ties and the added, significant property of being resistant to all types of abrasives except those approaching the hardness of diamonds. Such a ceramic material may be formed of a suitable aluminum oxide having, together with these properties, a high de- gree of purity, which has a reflective surface for irradiation by incident light which surface is smooth and planar "as fired". There is also provided for use in near infrared reflective measure- ments of constituents of samples, an analyzer which includes such a standard.

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