Chlorine dioxide sensor
AssigneeThe Board of Regents for Oklahoma State University
InventorsNicholas Materer, Allen Apblett, Dane Scott
Life of this patent
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Abstract
A chemical sensor is disclosed. The sensor has a test chamber for receiving chemicals in a gaseous state, the test chamber having two substantially transparent windows at first and second ends of the test chamber. The sensor uses a pulse operated ultraviolet light emitting diode at the first end of the test chamber emitting at a wavelength close to a maximum in the absorption band of a test chemical, and an electromagnetic sensor at a second end of the test chamber, the sensor being sensitive to the light emitted by the light emitting diode.
Claims13
A chemical sensor comprising:
- a test chamber for receiving chemicals in a gaseous state, the test chamber having two substantially transparent windows at first and second ends of the test chamber;
- an ultraviolet light emitting diode at the first end of the test chamber emitting at a wavelength close to a maximum in the absorption band of a test chemical and operating in a pulsed fashion to minimize photochemical reactions of the test chemical;
- and
- an electromagnetic sensor at a second end of the test chamber, the sensor being sensitive to the light emitted by the light emitting diode and detecting absorption of the light emitted around the maximum in the absorption band of the test chemical.
A chemical sensor comprising:
- a test chamber for receiving chemicals in a gaseous state, the test chamber having two substantially transparent windows at first and second ends of the test chamber;
- a pulse operated ultraviolet light emitting diode at the first end of the test chamber emitting at a wavelength close to a maximum in the absorption band of a test chemical;
- an electromagnetic sensor at a second end of the test chamber, the sensor being sensitive to the light emitted by the light emitting diode;
- a beam splitter interposing the pulsed ultraviolet light emitting diode and the window at the first end of the test chamber;
- and
- a reference photodiode;
- wherein the beam splitter directs a portion of the electromagnetic radiation from the ultraviolet light emitting diode to the reference diode and passes a remainder of the radiation into the test chamber.
Dependencies are inferred from the claim text.