Abstract:
A thermal sensor includes an array of pixels, each having a membrane mounted on legs over a reflector, forming a Fabry-Pérot cavity. Each membrane includes an infrared (IR) absorbing material that defines multiple spaced-apart openings separated by micron-level distances that decrease thermal capacity and increase IR absorption of the membrane. Regular pitch distances between adjacent openings provides narrowband IR absorption, with pitch distances below 7.1µm facilitating the detection of IR radiation wavelengths below 7.5µm. Multispectral thermal imaging is achieved by arranging the pixels in repeated groups (superpixels), where each superpixel detects the same set of IR radiation wavelengths. Thermal imaging devices include thermal sensors, IR lenses and device control circuitry arranged in a camera-like manner. A methane leak detection system utilizes two multispectral imaging devices positioned to image a wellhead from two directions, and a system controller that generates spatial and spectral information describing methane plumes using the image data.
Abstract:
A method of detecting an amount of a contaminant in an enclosure, the method comprising:
detecting (S7) a first amplitude of energy within a first wavelength band of a first width centered about an emission wavelength of the contaminant, the method characterized by:
detecting (S8) a second amplitude of energy within a second wavelength band of a second width larger than the first width, the second wavelength band also centered about the emission wavelength of the contaminant; determining (218) a ratio of the first amplitude of energy to the second amplitude of energy; and comparing (220) the ratio to a known threshold to determine the amount of contaminant in the enclosure.
Abstract:
The present invention relates to a heat gauge system for measuring radiant rays and, specifically, to a heat gauge system for measuring radiant rays, which may measure flux of the radiant rays according to a temperature change by using an infrared ray camera and is easy to design as a cooling unit is unnecessary and a structure is simple. The present invention comprises a gauge tube which is a cylindrical shape and composed of a metal; a washer arranged at one end part of the gauge tube for heating the gauge tube by passing radioactive rays through a hole formed in the center part; and the infrared ray camera for measuring the flux according to a temperature change of the gauge tube when the radioactive rays passed through the hole of the washer heat the gauge tube.
Abstract:
PURPOSE: A signal processing circuit for detecting a thermal image is provided to achieve a high-quality thermal image signal and to uniformly maintain an amplifying degree in each cell by removing a resistor installed at a front of an inverter amplifier. CONSTITUTION: A signal processing circuit includes a superconductive device, an output signal stabilizing section(12), an amplifying section(14), a low-pass filter(16) and an output section(18). The superconductive device converts wavelength of an infrared ray signal into an electric signal. The output signal stabilizing section(12) removes noise contained in the electric signal by forming a high-pass filter together with the superconductive device. The output signal stabilizing section(12) allows a first node to stably receive a signal. The output signal stabilizing section(12) has a first PMOS transistor and a first NMOS transistor. The first PMOS and NMOS transistors are turned on based n first and second control signals.