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US 9,506,804 B2Granted
Open path gas detector
AssigneeDetector Electronics Corporation
InventorsLiangju Lu, John King
Life of this patent
Estimating the term…
Abstract
In implementations, an open path gas detector is disclosed that can include imaging or non-imaging optical components. The detector can include components that allow for misalignment of radiation received by the detector of about 1 without causing false alarms. In implementations, the detector can include a beam splitter or a wavelength-division multiplexing filter to allow for more of the radiation received by the detector to be detected by the sensors.
Claims21
An open path gas detector comprising:
- an optical element operable to receive radiation from an objective optical element and separate the radiation into a first radiation portion and a second radiation portion;
- a first beam-shaping optical element operable to receive the first radiation portion;
- a first photodiode comprising a first active sensing region operable to receive the first radiation portion from the first beam-shaping optical element;
- a filter operable to receive and filter the second radiation portion to produce a second filtered radiation portion;
- a second beam-shaping optical element operable to receive the second filtered radiation portion;
- and
- a second photodiode comprising a second active sensing region operable to receive the second filtered radiation portion from the second beam-shaping optical element;
- wherein the first beam-shaping optical element and the second beam-shaping optical element are operable to provide a substantially uniform illumination intensity profile across an entire first active sensing region of the first photodiode and the second active sensing region of the second photodiode.
5 more elements
An open path gas detector comprising:
- an optical element operable to receive radiation from an objective optical element and separate the radiation into a first radiation portion and a second radiation portion;
- a first beam-shaping optical element operable to receive the first radiation portion;
- a first photodiode comprising a first active sensing region operable to receive the first radiation portion from the first beam-shaping optical element;
- a filter operable to receive and filter the second radiation portion to produce a second filtered radiation portion;
- a second beam-shaping optical element operable to receive the second filtered radiation portion;
- a second photodiode comprising a second active sensing region operable to receive the second filtered radiation portion from the second beam-shaping optical element;
- a reference field stop positioned near a focal point of the first radiation portion between the optical element and the first beam-shaping optical element;
- and
- an active field stop positioned near a focal point of the second radiation portion between the optical element and the second beam-shaping optical element.
6 more elements
An open path gas detector comprising:
- an optical element operable to receive radiation;
- a wavelength-division multiplexing (WDM) filter operable to receive the radiation from the optical element and separate the radiation into a first wavelength portion and a second wavelength portion;
- a first photodiode comprising a first active sensing region operable to receive the first wavelength portion;
- a filter operable to receive and filter the second wavelength portion to produce a second filtered wavelength portion;
- and
- a second photodiode comprising a second active sensing region operable to receive the second filtered wavelength portion from the second filter;
- wherein the radiation provided to the first active sensing region of the first photodiode and the second active sensing region of the second photodiode comprises a substantially uniform illumination intensity profile across an entire first active sensing region of the first photodiode and the second active sensing region of the second photodiode.
4 more elements
An open path gas detector comprising:
- an optical element operable to receive radiation;
- a wavelength-division multiplexing (WDM) filter operable to receive the radiation from the optical element and separate the radiation into a first wavelength portion and a second wavelength portion;
- a first photodiode comprising a first active sensing region operable to receive the first wavelength portion;
- a filter operable to receive and filter the second wavelength portion to produce a second filtered wavelength portion;
- a second photodiode comprising a second active sensing region operable to receive the second filtered wavelength portion from the second filter;
- a reference field stop positioned near a focal point of the first radiation portion between the optical element and a first beam-shaping optical element;
- and
- an active field stop positioned near a focal point of the second radiation portion between the optical element and a second first beam-shaping optical element.
5 more elements
Dependencies are inferred from the claim text.