An aircraft-mounted external fire detection system includes optical circuitry and processing circuitry. The optical circuitry is mounted on an aircraft forward of an engine nacelle of the aircraft, and is configured to optically monitor an exterior of the engine nacelle for a hydrocarbon fire by detecting radiation outside of the visible light spectrum. The processing circuitry is communicatively coupled to the optical circuitry and is configured to use the optical circuitry to determine that the fire has been continuously present for more than a threshold duration, and in response, transmit a warning to an operator terminal of the aircraft.

A computer-implemented method of forming a thermal-based electronic image of an object that includes receiving electromagnetic radiation emitted by the object at an optically sensitive layer including a superpixel having a plurality of pixels. Each pixel of the plurality of pixels includes a plasmonic absorber having a characteristic resonance wavelength and that generates a radiance measurement of the electromagnetic radiation at its characteristic resonance wavelength. The method further provides for determining, at a processor, an emissivity and temperature for the electromagnetic radiation received at the superpixel using the radiance measurements obtained at the pixels of the superpixel. In addition, the method provides for forming an image of the object from the determined emissivity and temperature.

A computer-eimplemented thermal imaging device having an optically-sensitive layer that includes a superpixel having at least one pixel. The at least one pixel includes a plasmonic absorber configured to obtain radiance measurements of electromagnetic radiation emitted from an object at a plurality of wavelengths. The device further includes a processor configured to determine an emissivity and temperature for the electromagnetic radiation received at the plasmonic material from the object using the radiance measurements and to form an image of the object from the determined emissivity and temperature.

A computer-eimplemented method and thermal imaging device includes a layer of plasmonic material and a processor. The layer of plasmonic material receive electromagnetic radiation from an object and generates radiance measurements of the electromagnetic radiation at a plurality of wavelengths. The processor determines an emissivity and temperature of the object from the radiance measurements and forms a thermal-based electronic image of the object from the determined emissivity and temperature.

Examples described herein generally relate to apparatus and methods for rapid thermal processing (RTP) of a substrate. The present disclosure discloses pulsed radiation sources, used to measure a broad range of low to high temperatures in the RTP chamber. In one example, two or more lasers, one of which emits pulses of radiation at 1,030 nm and one of which emits pulses of radiation at 1,080 nm, which measures temperatures below about 200 C., are used. In another example, two or more LEDs, one of which emits pulses of radiation at 1,030 nm and one of which emits pulses of radiation at 1,080 nm, are used. In yet another example, a broadband radiation source is used to emit pulses of radiation at least at 1,030 nm and 1,080 nm. These radiation sources are useful for detection of a broad range of low to high temperatures in the RTP chamber.

There are many industrial applications in which non-contact temperature sensing is useful for increasing production speed and quality, such as printing, laminating, extrusion, and metal forming. Disclosed is a non-contact temperature determining apparatus which uses two wide wavelength bands integrating sensors to determine the radiance ratio of a target and thereby determine a corresponding temperature of the target. Also disclosed is a non-contact temperature determining apparatus in which a beam splitter passes one wide wavelength band to a sensor and reflects another distinct wide wavelength band to another sensor from which temperature can be determined. A disclosed embodiment of the dual waveband temperature detector improves upon traditional and currently available ratio pyrometers by further reducing the cost of the system, making installation and use easier, and improving temperature detection for low temperature industrial applications.

An additive manufacturing temperature controller/temperature sensor uses one or more spectrophotometric sensors to monitor temperature of successive layers and preferably localized sections of successive layers of a melt pool, and transients thereof, of an object being generated for the purpose of dynamic control of the additive manufacturing device and/or quality control of the generated object manufactured with the additive manufacturing device. Generally, the additive manufacturing temperature controller/sensor apparatus monitors temperature of a section of the object during manufacture as a function of wavelength, time, position, and/or angle to determine melt extent in terms of radius and/or depth.

The present invention separates radiation from an object by a polarization filter 3 into polarized light beams, causes one of the beams to enter a spectrum analyzer 7 through a first optical path, causes the other to enter the spectrum analyzer 7 through a second optical path, and measures the two-color ratio, while causes radiation of a blackbody 2 placed in a vacuum ultralow temperature thermostatic chamber 1 in a quasi-thermal equilibrium state at an ultralow temperature in vacuo to enter the polarization filter 3 through a third optical path, separates the radiation into polarized light beams, causes the beams to each enter the same optical paths as the respective optical paths for the radiation of the object, causes the beams to enter the spectrum analyzer 7, measures the two-color ratio, and accurately obtains the temperature of the object on the basis of these two two-color ratios.

Fabry-Perot based optical computing devices and temperature sensors are disclosed for a number of applications including, for example, in-situ downhole fluid analysis and temperature detection.

Devices, methods, systems, and computer-readable media for a multispectral band system are described herein. One or more embodiments include a filter comprising a first designated transmittance value for a first wavelength range and a second designated transmittance value for a second wavelength range, a sensor to receive transmitted radiation from the filter, and a computing device coupled to the sensor to detect any radiation within the first and second wavelength ranges from the received transmitted radiation from the filter and wherein the detected radiation in the first wavelength indicates a particular type of radiation source and detected radiation in the second wavelength range indicates one or more other items within a field of view of the received radiation.