Abstract:
A low-radiance infrared airborne calibration reference is an infrared imaging and calibration method. The method includes positioning a mirror perpendicular to an optical axis of a focal plane array in both an open-face position and a mirror-reading position. Temperatures of a lens, window, and the mirror are determined. In-band radiance and offset is calculated to generate an adjusted calibration curve.
Abstract:
Devices and corresponding methods can be provided to measure temperature and/or emissivity of a target. Emissivity of the target need not be known or assumed, and any temperature difference between a sensor and the target need not be zeroed or minimized. No particular bandpass filter is required. Devices can include one or two sensors viewing the same target as the target views different respective viewed temperatures. The respective viewed temperatures can be sensor temperatures, and a single sensor can be set to each of the respective viewed temperatures at different times. An analyzer can determine the temperature and/or emissivity of the target based on the respective viewed temperatures and on plural net heat fluxes detected by the sensors and corresponding to the respective viewed temperatures.
Abstract:
In an embodiment, a temperature measurement device is provided with: light collection means; extraction means; optical intensity calculation means; and temperature measurement means. The light collection means collects the emission spectrum of a measurement subject. The extraction means extracts beams having the wavelength of the atomic spectral lines and a beam having a wavelength in a wavelength region where there are no atomic spectral lines, from the emission spectrum collected by the aforementioned light collection means. The optical intensity calculation means calculates the optical intensities of the beams extracted by the aforementioned extraction means. The temperature measurement means calculates the temperature of the aforementioned measurement subject, based on the intensities of the beams calculated by the aforementioned optical intensity calculation means.
Abstract:
Disclosed are methods and apparatus for determining an unknown degree of amorphicity in a bulk-solidifying amorphous alloy. A specimen can be prepared from the alloy, irradiated with passive radiation, imaged to provide a thermal image, and the image analyzed to assess the differences in emissivities in the image. The degree of amorphicity can be determined based on the differences in thermal emissivities.
Abstract:
A method for measuring the differential emissivity between two sites on the surface of a body and the temperature of the two sites. The method includes a plurality of measurements of the infrared radiation arising from each of the two sites under a number of different conditions. Some of the measurements include irradiation by external infrared radiation at a known wavelength and intensity. The infrared radiation arising from each of the sites may include emitted radiation, reflected ambient radiation, and reflected external radiation. Additionally, the temperature determined using the method described can be used to calibrate infrared imaging devices used to inspect the entire body.
Abstract:
A method for measuring the differential emissivity between two sites on the surface of a body and the temperature of the two sites. The method includes a plurality of measurements of the infrared radiation arising from each of the two sites under a number of different conditions. Some of the measurements include irradiation by external infrared radiation at a known wavelength and intensity. The infrared radiation arising from each of the sites may include emitted radiation, reflected ambient radiation, and reflected external radiation. Additionally, the temperature determined using the method described can be used to calibrate infrared imaging devices used to inspect the entire body.
Abstract:
This invention provides a new safety device for monitoring the cooking process of conventional range-top by adding a temperature measurement unit and algorithm to detect abnormal cooking scenarios. The safety device includes an active radiation signal generator, which emits radiation at a known frequency. The system differentiates between the passive signal and reflected signal of the total emitted radiation signal in order to calculate the accurate emissivity value of the target object The safety device is programmed to identify different heating scenarios by comparing the actual temperature/time curve of target object to temperature/time curves of known cooking scenarios. When a hazardous situation is identified, actions are taken to prevent fire.
Abstract:
The invention describes a procedure and an arrangement for measurement of temperature and thickness of layer during a deposition or coating process. As coating or depositing processes known technologies of semi-conductor manufacturing arrangements, plasma devices, ion devices, and other dry-etching arrangements may be used. The invention can also be applied to the manufacture of optical coatings. As a consequence of interference of the thermal radiation of the substrate at the growing layer, the emissivity .epsilon. changes continuously during coating or depositing, therefore, a pyrometric measurement of temperature may not be applied. This basic problem is solved by the invention, which uses a reflectometer, which determines the reflectivity R of the wafer. According to the law of conservation of energy .epsilon.=1-R so that with said reflectometer the actual emissivity of the whole (multi-layer) system may be determined. The measurement of temperature then is effected by means of a determination equation. Concurrently the thickness is determined by a comparison of the reflectometer-curve and a theoretical dependency of thickness of layer.
Abstract:
A method of using infrared light for measuring the temperature of a semiconductor element with a surface layer formed by two kinds of materials that have different emissivities and optical reflectances is disclosed. The method includes the step of taking an image with diffused light reflected from the surface of a semiconductor element by an image taking device. The method further includes determining the area ratio with which each of the two kinds of materials occupy the surface of the semiconductor element by comparing the average brightness value of the image by the image taking device with the brightness value of an image wherein each of the materials independently forms the surface layer of the above semiconductor element, obtaining a weighted average of the emissivities of the materials with the area ratio at which each of the materials occupies on the surface of the semiconductor element, and calculating the temperature of the semiconductor element based on the weighted average and the actual amount of infrared emission.
Abstract:
A method of determining true temperatures of a heated target material by its radiation based on prior knowledge of an emissivity function which describes the relationship between two spectral emissivities for the target material, comprising measuring two radiances corresponding to said two spectral emissivities from the target material, assuming a temperature of the target material, then calculating a pair of emissivities which satisfy the emissivity fuction whereat the assumed temperature is the true temperature of the target material.