11-03-2021 дата публикации
Номер: US20210074757A1
Принадлежит:
A system for use in identifying a user includes a portable emitter transported with the user. The emitter includes a quantum cascade laser configured to emit a thermal beam identifying a location of the user in response to a command, the thermal beam having a wavelength between approximately 2 μm and approximately 30 μm. 130-. (canceled)31. A system , comprising:a housing;a light source disposed within the housing and configured to emit a beam of infrared radiation;an optical system optically downstream from the light source, the optical system being configured to receive the beam and to direct the beam to exit the housing; and 'due to the characteristic being varied, the beam is distinguishable from a background object in a corresponding image generated by a thermal imager detecting the beam.', 'the controller being configured to vary a characteristic of the beam, during emission of the beam, such that, 'a controller operably connected to at least the light source,'}32. The system of claim 31 , wherein the characteristic comprises one of a divergence claim 31 , a wavelength claim 31 , a power claim 31 , or an intensity of the beam.33. The system of claim 31 , wherein the beam of radiation received by the optical system from the light source comprises a divergent beam.34. The system of claim 31 , wherein the housing defines a hermetically sealed environment claim 31 , and at least the light source and the optical system are disposed within the hermetically sealed environment.35. The system of claim 31 , wherein the optical system comprises a beam shaping optic claim 31 , and the characteristic is varied claim 31 , at least in part claim 31 , by changing a distance along an optical path between the beam shaping optic and the light source.36. The system of claim 31 , wherein the optical system comprises a first beam shaping optic and a second beam shaping optic claim 31 , and the first beam shaping optic is movable relative to at least the second beam shaping optic.37 ...
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