Open path gas detector
First Claim
Patent Images
1. 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.
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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.
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Citations
21 Claims
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1. An open path gas detector comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 11)
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8. An open path gas detector comprising:
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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. - View Dependent Claims (9, 10)
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12. An open path gas detector comprising:
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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. - View Dependent Claims (13, 14, 19, 20)
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15. An open path gas detector comprising:
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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. - View Dependent Claims (16, 17, 18, 21)
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Specification