Oxygen measurement using visible radiation

Patent · Mon Mar 07 23:00:00 EST 1988

OSTI ID:5004774

Wong, J Y

This patent describes an apparatus for use in an instrument that measures the absorption of a sample by passing radiation through the sample, the sample having more than one absorption line including an absorption line at wavelength lambda/sub o/. The apparatus serves to positively identify the absorption line being measured as the absorption line at wavelength lambda/sub o/. The apparatus comprises: source means including a diode laser responsive to an applied electric current to produce radiation and emitting a part of that radiation in a first direction toward the sample, and emitting another part of that radiation in a second direction; a first detector positioned to receive radiation that was emitted in the first direction after it has passed through the sample, and generating a first electrical signal related to the intensity of the radiation received by the first detector; a filter positioned to intercept the radiation emitted in the direction, and a second detector positioned to receive radiation that has passed through the filter, and generating a second electrical signal related to the intensity of the radiation received by the second detector.

• Assignee: Hibshman Corp., San Luis Obispo, CA
• Patent Number(s): US 4730112
• OSTI ID: 5004774
• Country of Publication: United States
• Language: English

Related Subjects

440300* -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
ABSORPTION
CURRENTS
DETECTION
ELECTRIC CURRENTS
ELECTROMAGNETIC RADIATION
ELEMENTS
FILTERS
LASERS
LIGHT SOURCES
MEASURING INSTRUMENTS
NONMETALS
OPTICAL FILTERS
OXYGEN
RADIATION DETECTION
RADIATION DETECTORS
RADIATION SOURCES
RADIATIONS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
VISIBLE RADIATION
WAVELENGTHS