Optical measuring instrument
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United States of America Patent
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Aug 26, 2003
Grant Date -
N/A
app pub date -
May 24, 2001
filing date -
Oct 13, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A highly reliable optical measuring instrument for multi-channel simultaneous measurement has an intensity of light emitted from a light source modulated at different frequencies and the light is applied to multiple positions of a test object. The light which is detected from the test object is converted into electric signals by a photodiode, and modulation signals are detected by a lock-in amplifier module. The signals are processed as information on the test object interior by a processing unit. Light is applied sequentially from a light source in a preparatory measurement step prior to final measuring, and the signal level of the detection light is measured for each light applied position. A control unit controls light intensity and detection signal level to ensure that the difference in detection light levels is kept within a specified range.
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