Apparatus for near infrared quantitative analysis
First Claim
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1. An apparatus for near infrared quantitative analysis comprising:
- a plurality of pulsed infrared emitting diodes (IREDs) of specific one-half power bandwidth;
means for providing pulses to control the on off status of the IREDs;
a highly sensitive infrared detector positioned to receive infrared energy reflected or transmitted through a sample;
a plurality of stationary bandpass filters each selected to allow passage of a preselected wavelength band through it, which selected band is outside the one-half power bandwidth of the IRED, each of the said bandpass filters positioned between each of the said IREDs and the infrared detector;
means for preforming the said quantitative analysis based on the energy received by said infrared detector.
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Abstract
An apparatus for near infrared quantitative analysis with an infrared emitting diode (IRED) source utilizes narrow bandpass filters and silicon detectors to provide highly accurate and inexpensive measurement. A narrow bandpass filter in the light path of the IRED passes wavelengths outside the half power bandwidth points of the IRED. A silicon detector together with a sensitive amplifier is used to accurately measure linearly up to six decades of light sensitivity at desired wavelengths.
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7 Claims
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1. An apparatus for near infrared quantitative analysis comprising:
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a plurality of pulsed infrared emitting diodes (IREDs) of specific one-half power bandwidth; means for providing pulses to control the on off status of the IREDs; a highly sensitive infrared detector positioned to receive infrared energy reflected or transmitted through a sample; a plurality of stationary bandpass filters each selected to allow passage of a preselected wavelength band through it, which selected band is outside the one-half power bandwidth of the IRED, each of the said bandpass filters positioned between each of the said IREDs and the infrared detector; means for preforming the said quantitative analysis based on the energy received by said infrared detector. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification