Photoelectric Measurement of Generator Rotor Temperature
Photoelectric Measurement of Generator Rotor Temperature in Journal of Engineering of Wuhan University Yue Youlan Jiaozuo University, Jiaozuo, Henan 454001, China The main supplier is based on the light absorption characteristics of gallium arsenide semiconductors. A new type of rotor temperature measurement system was designed. Using simulation devices, dynamic in real time. In the case of non-contact. Realization of generator rotor temperature detection. Has achieved satisfactory results. To ensure the safe and economical operation of power plant generator sets and prevent them from being seriously damaged, it plays a decisive role in the stable operation of the power system and uninterrupted power supply for users. The temperature rise of the rotor surface of large turbogenerators is particularly serious due to the additional heat generated by the generator rotor ends and their contact points, which has become an important factor affecting the safe operation of the generator. The traditional method of monitoring the rotor temperature of a generator is a carbon brush slip ring contact measurement radio electronic measurement and infrared temperature measurement. Each of these methods has its own advantages and disadvantages, but it is difficult to monitor multiple points at the same time and the anti-interference ability is poor. At present, direct testing methods for monitoring the temperature of large generator rotors are still under investigation. Reports on the use of the optical properties of phosphors to measure the temperature of generator rotors have been reported abroad3. The difficulties of this method are difficult to find. Suitable fluorescent substance. We designed a new type of sensing structure and adopted this new type of temperature measurement scheme. It has the advantages of simple structure, easy installation, and high precision of non-contact temperature measurement. Within the 70150 Celsius range, the simulated measurement temperature difference is within 2. 1 Principles and devices of photoelectronic temperature measurement 1.1 Light absorption in gallium arsenide crystals When semiconductors are excited by photons, they cause two basic types of transitions, namely direct and indirect transitions, and the bandgap of semiconductor crystals. The light absorption process in the crystal is directly related and the forbidden band width is a temperature-dependent monotonous function. The forbidden band width is reduced due to an increase in the body temperature, and the light absorption process in the crystal is strengthened, so that the crystal luminosity rate is decreased, and accordingly temperature check. The gallium arsenide crystal has a high electron enthalpy rate, a large band gap, a direct transition type energy, and a mechanism, and is a material for making a semiconductor temperature sensor. The actual temperature sensitive element used in the experiment was intrinsic GaAs thin body. When the thickness of the gallium arsenide crystal reaches a certain value, it is further smaller than the wavelength of the forbidden band. When the thickness of the incident photon is longer than the wavelength of the forbidden band, there is almost no absorption. It was found that the following formulas establish the power spectrum distribution of the incident light source of the center of the house, the lower and upper wavelengths of the light source spectrum, 7 the light energy transmission rate corresponding to the temperature, and the gallium arsenide mass band temperature of 7°C. The width should be the wavelength of the visit. Light source experimental curves. The temperature of the abscissa in the middle and the ordinate of the telecommunication output from the small light source detector change the transmittance of the detector's electrical signal. Due to the white light source spectral work.åž Bifurcation is more uniform and the marriage line is close to the wavelength of light. 1.3 Structural Design and Analysis of Temperature Measurement System The ideal temperature measurement method should satisfy the conditions of the surface (1) The actual signal and reference signal should use the same light source. (2) The actual optical signal and the reference optical signal are received by the same photodetector and amplified by Tongtun Road. There are so. This can be compared with the theoretical formula 2. The experimental result of the semiconductor light emitting diode 0 is a curve, which is related to its optical power distribution. If the curve is differentiated, the obtained differential curve is close to the spectral power distribution line of 1 on the 1 and the progress has verified the correctness of the theoretical formula. 1.2 Two basic measurement methods for measuring the light absorption characteristics of gallium arsenide semiconductors. Its principle 3, assuming that the spectrum of the light source used is concentrated in the vicinity, when the temperature rises, due to the decrease of the transmittance, the optical power received by the detector decreases, and the amplitude of the output telecommunication decreases. After the calibration, the root can be reduced, and the amplitude of the detector signal is transmitted. The size to determine the level of temperature to be measured, in this measurement method, the main should eliminate the impact of light fluctuations. Sideband wavelength detection method. The basic principle of this temperature measurement method is that, for a certain thickness of gallium arsenide semiconductor, the bandgap energy close to a certain temperature value is 1 private 7 and small; the wavelength to be used for paying attention is not, when the wavelength of light is near the heart, Its transmittance is sensitive to the temperature of goods. At the right time, the light waves penetrating into the product are absorbed by the crystals of the corpus callosum, whereas the wavelengths of the human input 5 are degenerated. The temperature value to be measured can be accurately obtained. The main problem that this method solves is the interference of ambient light. On the other hand, when the light detector and the light source are on the 1 side. This method is limited to 1 In the generator rotor temperature measurement program, we choose from the requirements of the simple and economical practicality of the structure to choose the amplitude detection method to service the source of fluctuations and other factors such as the light path interference. The 7 view reflects the actual temperature signal. In our actual requirements and characteristics of turbine rotor dynamic detection, we have ingeniously solved the above-mentioned question 2: Transmittance 7 and temperature curve 10 Detector 2 Realize the dynamic on-line detection and measurement point of rotor temperature of turbine rotor position. A convenient way to solve this problem is to browse through the sign signals to resolve the positioning of the measurement points. Can eliminate the light source fluctuations and other interference factors. At the same time, using the characteristic parameters of the semiconductor temperature sensing element and the marking element itself, the calibration in the temperature measurement can also be solved. The structure of the temperature sensitive element and the sign element is 67. i, 2 Reflective gold film 6-foot semiconductor temperature sensitive children's structure. A wide gallium arsenide crystal is attached to a columnar glass substrate to a thickness of (1) (b) crystal blood polish, and a reflective gold gel is plated at the interface between the gallium arsenide crystal and the glass substrate. The light wave part penetrating into the gallium arsenide crystal is reflected along the original route, and the helium used by the nine users emits light. The ratio of 2.3+2 to 2 is the ratio of the reflected light to the crystal surface only to the characteristic parameters of the temperature sensing element of the semiconductor, such as the blood emissivity. Film reflectivity and crystal transmittance 7 meaning. In addition to the pass rate and temperature storage. All other scenes are fixed. Set the value of the electrical signal to be used with 3+27 inches, no, and the signal value corresponding to 2 to use the team. Their ratio is only related to the crystal temperature. Measure the ratio of, and through the calibration, you can push out the temperature at the crystal. For example, there is no reflective gold film. 2 The thickness of the gallium arsenide product is greater than this, and the light transmitted through the crystal can be completely absorbed by the crystal. The light source detector only receives the surface reflection light number 2, does not contain the temperature signal, that is, the sign signal ij n, the electrical signal caused by the light signal reflected from the temperature sensor of the gallium arsenide crystal semiconductor is returned by the identification element. The electrical signal 7 caused by the temperature-independent optical signal is checked by the microcomputer and the corresponding software to obtain the corresponding measurement point temperature. Transmit coefficient; Your detector response is considered to be constant within the spectral range of the light source used; 0, The incident light to the crystal surface is related to the characteristic parameters of the instrument itself, depending on the temperature and the temperature. Therefore, according to this temperature calibration and measurement is 1.4 detection circuit if embedded in the turbine rotor and the surface of the circumference of a semiconductor temperature sensor and a marker element Hugh then by the photodetector to obtain the analog signal waveform 8 midpoint waveform The turbine rotor rotates at high speed. Among them, the temperature signal of the pulse detector 3 is pulsed. Obviously, in order to correctly obtain the ratio relationship between the electrical signal and the marker signal of each measuring point, it is necessary to be able to maintain and measure the peak value of the electrical signal and the mark 1 of each measurement point. Acquire the output waveform of the analog circuit. On the other hand, the analog circuit itself should have a logic doubler which can provide 8 or 8 microcontroller 0 converters. As well as preventing false peak detection and keeping the threshold level adjustment function, the signal acquisition shuttle circuit function block box The complete waveform and timing logic 8. Child 5, respectively, the waveform of the corresponding point in 9. 2 Experimental research In order to study the performance of the temperature measurement system, a simulation device was designed. It is used to simulate the rotor and condition of the generator and the rotation gauge. In the simulation device, the performance test of the temperature measurement system was performed on a single probe point. 2.1 Dynamic temperature rise and fall process The system temperature measurement experiment uses the heating device to increase the temperature and cool down the crystal. Simulate the temperature rise and cool down process of the generator rotor. The temperature measurement system measures the temperature of the crystal surface in real time and records the temperature value of the conventional temperature instrument. In the actual two sets of temperature rise and fall curves, the ordinate system measured values, the abscissa temperature gauges, the middle, the heating process measurement curves, and the 6 cooling process measurement curves, the two sets of measurement data are performed under the same conditions. Photovoltaic shed amplifiers adopt fixed-controller comparators, split-circuit comparators 1 and non-sampling helium-soldiers, and integrated monolithic trigger thermometers have a finger error within 4 and at 140, with an error of 2; As the temperature rises, the value of the temperature measurement system and the temperature meter tends to increase. The reason for this phenomenon is that the central wavelength of the luminescence spectrum of the infrared luminescence tube is biased towards the high side. 2.2 System Temperature Measurement Repeated Experiments The repeated parts of the temperature measurement system represent an important aspect of system performance. For this purpose, we have performed group temperature-raising experiments at different times. The obtained temperature measurement curves are experimentally determined, and in the high temperature region, the curves are Reproducibility is good, but there are many factors that influence the repeatability of the degree meter C. There are mainly the following factors: the temperature within the device rises, the temperature of the emission spectrum of the emitter tube drifts, and the center wavelength shifts to the long wave direction. Effect of vibration and noise 3 The temperature difference between the GaAs crystal of the thermo-sensitive component and the analog rotor is not good and there is a temperature difference; there is a calibration error, the sensor of the measurement system has nonlinearity, and the sensitivity in the low temperature stage is low, ie, the value of the temperature meter r signal noise Relatively low. So at 70, the following repeatability is slightly different. 2.3 Temperature measurement system response performance test Temperature measurement system's actual response speed is very fast, including the explicit delay time, the group temperature data measurement only needs 48 or so, truly real measurement system. In order to further investigate the temperature measurement system temperature, a temperature test was performed on this process. Heater voltage change process, that is the actual temperature measurement result 13, the curve is the temperature instrument refers to the curve, and curve 5 is the temperature measurement system measurement curve. The dynamic process reflected by the curve includes the thermal inertia of the entire probe head! . The difference between the curve and curve 5 in the cooling phase is mainly due to the contact temperature difference between the temperature sensing head and the simulated rotor during rapid cooling. Therefore, this tells us that in the actual measurement, we should try to make the temperature sensor and the generator rotor measuring point in close contact, so as to facilitate the response speed setting of the temperature system. The heating voltage changes over the system has the following characteristics: 1 The system structure is easy to install, and it can be non-contact in real time Conclusion 8 Chen, Liu Xianbin. Stochastic finite element method and its engineering application, Chengdu Southwest Jiaotong University Press, 1993. Iiq Zhang Wenzheng, Liu Lingyao, Chen Zuyu, et al. Tieshan Earth Dam Stress Deformation Values ​​and Observations Analysis The China Civil Engineering Society The 1st Soil Mechanics and Foundation Engineering Conference Proceedings Beijing China Building Engineers Topics on page 63 The system has good stability and repetitive anti-jamming and response characteristics. Compared with the traditional temperature measurement method, multi-point monitoring can be completed. After proper improvement, the temperature of the rotor can be tested for circulation. l Huang Ronghua. Discussion on the Method of Temperature Measurement for Rotor of Turbogenerator. Motor 2 Chen Zunrong, Huang Yaoqun, and Wang Bin. Non-contact temperature measurement of synchronous motor rotor. Oriental Motor, 199524751.
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