Abstract:
A bichromatic pyrometer for detecting the high temperature of a surface element of an object comprises two photodiodes (18, 19) receiving radiation from the object, each of the photodiodes having a large forbidden band and being sensitive to radiation in a given range of wavelengths, said sensitivity ranges being different and being situated in the visible or near visible regions of the spectrum, said ranges being obtained by selecting the value of the forbidden band of the material constituting each of the photodiodes (18) and (19), said forbidden band being greater than or equal to that of silicon (.gtoreq.1.11 eV). The pyrometer is capable of measuring rapidly changing surface temperatures with great accuracy.
Abstract:
A method for sensing the temperature of a remote object within a chamber that is heated from outside the chamber, includes sensing radiation from the object within the chamber through a window in the wall of the chamber that exhibits different transmissivity than the wall of the chamber to radiation in a selected waveband relative to the waveband of the radiation supplied through the wall of the chamber to heat the object within the chamber.
Abstract:
Dual pyrometric detectors and method measure the temperature of a remote heated object in the presence of ambient radiation. One detector measures emitted radiation from both the remote object and from the environment, and the other detector measures radiation predominantly from the environment alone. The output signals from the two detectors are processed electronically to yield the detected radiation from the remote object alone. The result can then be electronically processed to display the pyrometrically-measured temperature of the remote object.
Abstract:
An optical fiber thermometer system utilizing the laws of blackbody radiation includes a sensor responsive to the temperature within a region to be tested for transmitting light energy generated as a function of the temperature according to Planck's equation along an optical transmission line, and a detector responsive to the light energy for producing an electrical current. The current is amplified by a linear amplifier having provision for automatically controlling the gain of the amplifier, depending upon the magnitude of the input current, to reduce the dynamic range of the input current. The output of the linear amplifier is a voltage which is used by a signal processing network to yield an accurate indication of the temperature within the region to be tested by solving the Planck equation between two predetermined wavelengths representing upper and lower limits of an optical filter which filters light energy entering the detector.
Abstract:
A reflection corrected radiosity optical pyrometer includes an optical guide for receiving a target optical beam from a turbine blade in a jet engine. The target optical beam is provided to a detector module that divides the target optical beam into two beams, one having a spectral width selected to be less than the target optical beam spectral width. A signal processor receives signals from the detector module indicative of the energy of the two beams, calculates a reflection corrected energy signal directly therefrom and provides a correct target temperature signal.
Abstract:
In a semiconductor color sensor circuit with two photodiodes having mutually different wavelength sensitivity characteristics, the ratio of numbers or areas of two types of transistors for logarithmic compression of signals from these photodiodes is adjusted so that errors in output voltage due to changes in temperature can be reduced and the dynamic range of illuminance of incident light can be enlarged.
Abstract:
There are provided an optical non-destructive inspection apparatus that can inspect a measurement object such as a wire bonding portion in a broad measurable temperature range in a short time, with high reliability, and an optical non-destructive inspection method using it. The apparatus includes a focusing-collimating unit (10), a heating laser beam source (21), a heating laser beam guide unit, a first infrared detector (35), a second infrared detector (31), an emitted-infrared selective guide unit, and a control unit (50). The control unit (50) controls the heating laser beam source (21), measures a temperature rise characteristic that is a temperature rise state of a measurement spot (SP) based on a heating time, on the basis of a ratio between a detected value from the first infrared detector (35) and a detected value from the second infrared detector (31), determines a state of a measurement object (a bonding structure (97)) based on the temperature rise characteristic, and changes at least one of wavelengths of infrared light beams guided to the first infrared detector (35) and the second infrared detector (31) based on a measured temperature during measurement.
Abstract:
Pyromètre bichromatique pour la détection de la température élevée d'un élément de surface d'un objet, comprenant deux photodiodes (18, 19) recevant le rayonnement de l'objet, chacune à large bande interdite et sensible au rayonnement dans un domaine de longueurs d'onde donné, ces domaines de sensibilité étant différents, et situés dans le visible ou proches du visible, et étant obtenu par le choix de la valeur de la bande interdite du matériau constitutif de chacune des photodiodes (18) et (19), qui est supérieure ou égale à celle du silicium (≧1,11e V). Détermination de la température de surfaces rapidement évolutives avec une grande précision.
Abstract:
The system includes infrared sensors with sensing wavelength bands sensing an infrared radiation from an infrared sources(S). One of the sensing wavelength bands is a CO₂-molecular resonance radiation wavelength band. The system determines whether a disastrous fire occurs or not on the basis of outputs of the sensors and a time change in a ratio of the outputs. The process computes the temperature of the infrared source from a ratio of outputs of infrared sensors (3a, 3b, 3c, 3d) with at least two sensing wavelength bands of an infrared radiation from a monitored area, produces the intensity of infrared radiation of either of the bands from the computed temperature and computes a heating area from the intensity and the output of a corresponding infrared sensor. The process determines the progress of a fire. The monitor produces a control signal to an air conditioner or room heater-and-cooler from outputs of a sensor and an output of a thermometer.
Abstract:
Disclosed in the present invention is a visual monitoring method for cross-section temperature fields and radiation characteristics of boiler furnaces by combining radiation images and spectra. Image detectors can be directly inserted into observation holes of a boiler to acquire flame image data, so that when the detection system is applied to a power station boiler, extra holes are not required to be drilled, and therefore, there is no risk that the strength of a furnace wall of the boiler is reduced by drilling holes. According to cross-section temperature fields of a furnace measured by the detection system, the state of combustion in the furnace can be accurately judged, which can play an accurate and effective guiding role in boiler combustion control, and reduce the temperature deviation in each combustion area of the boiler so as to keep the boiler running smoothly, thereby improving the combustion efficiency of the boiler.