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US 11,359,963 B2Granted
Variable laser energy multi-spectrometer for gas and particulate chemicals in air
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsKin Chiu Ng, Subrata Sanyal
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Abstract
The present invention relates to the design, construction, and operation of a laser air-sampling multi-spectrometer; its operation with variable laser energy to simultaneously and/or sequentially perform spectrometric techniques of LAS, LEFS, RSS, and LIBS. The combined spectrometric operation will detect gas and particulate chemicals directly in a flowing stream of air sample and/or particulate chemicals on filter collected from the flowing stream of air sample.
Claims9
A spectrometer system comprising:
- a spectrometer coupled to an optical section;
- a laser source;
- a first beam splitter, a second beam splitter, and a filter wheel disposed between the optical section and the laser source;
- a collimating scope disposed between the optical section and the second beam splitter;
- a filter photodiode;
- and
- a delay gate electrically coupled to the filter photodiode and the spectrometer,
- wherein the laser source directs energy to the first beam splitter, wherein the first beam splitter directs energy towards the optical section in a first direction and towards the second beam splitter in a second direction, wherein the second beam splitter directs energy towards the optical section in a third direction and towards a fourth direction, wherein the filter photodiode is disposed along the fourth direction.
5 more elements
A method of spectroscopy comprising:
- directing a first laser energy towards a first beam splitter to create a second and a third laser energy;
- directing the second laser energy towards a collection filter disposed within an optical section;
- directing the third laser energy towards a second beam splitter to create a fourth and a fifth laser energy;
- directing the fourth laser energy towards a collimating scope coupled to the optical section;
- directing the fifth laser energy towards a filter photodiode;
- generating a first detection signal in the filter photodiode when the filter photodiode detects the fifth laser energy;
- and
- generating a second detection signal when a spectrometer detects the second and the fourth laser energies.
5 more elements
Dependencies are inferred from the claim text.