A method for increasing accuracy of measurement of body temperature includes a step of collecting an infrared signal to obtain an infrared signal value (step 1), a step of collecting a skin image to obtain a calibrating emissivity (step 2), a step of obtaining a calibrated infrared signal value according to the calibrating emissivity and the infrared signal value obtained in step 1 (step 3), and a step of making a conversion into an actual body temperature (step 4). Accordingly, an actual temperature value of the skin surface can be attained to increase the accuracy of measurement effectively, thereby allowing the measured result to be more close to the real body temperature of a tested target.

A combined optical system for determining temperature of the surface of an object or material and its distance with respect to a predetermined reference point associated with the system includes an optical radiation source emitting optical probe radiation at a predetermined wavelength or in a predetermined wavelength range, a source control unit controlling switching of the source from an operative condition, in which it emits optical probe radiation, to an inoperative condition, in which it does not emit optical probe radiation, optical detectors acquiring scattered optical radiation and thermally emitted optical radiation from the surface of the object or material, and a processing unit determining the distance of the surface of the object/material based on scattered optical probe radiation when the source is operative, and the local temperature of the surface of the object/material on the basis of thermally emitted optical radiation when the source is inoperative.

An infrared-detecting device, includes an infrared detector configured to emit a signal representative of the thermal radiation of a hotspot, and a light source configured to emit an incident beam, preferably in a window of UV or visible wavelength. The infrared-detecting device furthermore comprises a synchronizing device connected to the light source and to the infrared detector or to the processing module, and configured to emit a synchronization signal, the infrared detector being configured to be activated in a preset time window depending on said synchronization signal.

A method for detecting differences in surface properties of one or more components is provided wherein the infrared radiation emitted by the component at a specific temperature of the component is detected as irradiance on a selected receiver surface relative to the component. When detecting at different positions or on a plurality of components, the solid angle covered by the receiver surface and the distance from the component surface is almost unchanged and differences in the detected irradiance can then be equated with differences in the surface properties of the components. The invention further relates to use of such methods for monitoring and optionally adjusting the surface quality of a component, as well as to a device for adjusting the surface properties in the series production of components.

A scale composition determination device (10) determines that Fe.sub.2O.sub.3 has been generated in the outermost layer of a scale (SC) in the case where the absolute value of a difference between temperatures of a steel material SM measured by radiation thermometers (20a, 20b) is equal to or more than a predetermined temperature, and determines that Fe.sub.2O.sub.3 has not been generated in the outermost layer of the scale (SC) in the case where the absolute value of the difference between the temperatures of the steel material SM measured by the radiation thermometers (20a, 20b) is not equal to or more than the predetermined temperature.

A method for detecting whether an article with an abnormal temperature is placed in a refrigerator. The method includes: controlling a plurality of infrared sensors to collect temperature values after a door body is opened; determining whether an abnormal storage space in which the article with the abnormal temperature is possibly placed exists in a plurality of storage spaces; acquiring a first temperature change value of the abnormal storage space between time points before and after the article with the abnormal temperature is possibly placed in the abnormal storage space and a second temperature change value of the abnormal storage space caused by heat exchange between an external environment and the abnormal storage space between said time points; and determining whether the article with the abnormal temperature is placed in the abnormal storage space according to the first temperature change value and the second temperature change value.

A multi-spectral temperature measuring device based on adaptive emissivity model and temperature measuring method thereof are provided, which is configured to measure the temperature of the surface of an object under a high temperature background. The present invention relates to the technical field of radiation temperature measurement. The present invention provides a multi-spectral temperature measurement device based on an adaptive emissivity model, includes a pyrometer, a radiation detector, a constant temperature furnace, a cooling cavity, a cold air inlet pipe, a cold air outlet tube, and a thermocouple and thermocouple acquisition card. In order to more accurately measure the surface temperature of the object in a high-temperature environment, a BP network is provided to adaptively find the emissivity model, and through pre-training the network, the network has a high degree of recognition, and then classifies the spectral curve to accurately output the corresponding emissivity model.

Devices and corresponding methods can be provided to monitor or measure temperature of a target or to control a process. Targets can have low, unknown, or variable emissivity. Devices and corresponding methods can be used to measure temperatures of thin film, partially transparent, or opaque targets, as well as targets not filling a sensor's field of view. Temperature measurements can be made independent of emissivity of a target surface by, for example, inserting a target between a thermopile sensor and a background surface maintained at substantially the same temperature as the thermopile sensor. In embodiment devices and methods, a sensor temperature can be controlled to match a target temperature by minimizing or zeroing a net heat flux at the sensor, as derived from a sensor output signal. Alternatively, a target temperature can be controlled to minimize the heat flux.

Food cooking unit composed of gas burners (1), regulation electrovalves (3) of the supplied gas; an infrared sensor (5) focused towards the cooking zone; a thermocouple (6) in thermal contact with the flames and in connection with a safety electrovalve (4) through a relay (10) and an electronic control device (7) connected to said infrared sensor (5), to said at least one regulating electrovalve (3) and the relay (10) and that stores different regulation programs and that regulates the regulating electrovalve (3) and/or interrupts the thermocouple connection with the safety electrovalve in response to the signals obtained from the infrared sensor (5) and/or the thermocouple (6), and issues warnings in response to signals from the thermocouple (6).

Methods and apparatus, including computer program products, for detecting a problem with a thermal camera. A current contrast value is determined for the thermal camera. It is determined whether the current contrast value deviates from a reference contrast value by more than a predetermined value. In response to determining that the current contrast value deviates from the reference contrast value by more than a predetermined value and for more than a predetermined period of time, an indication of a problem with the thermal camera is provided.