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 Posted: Tue 14:44, 07 Dec 2010 Post subject: true religion jeans Based on information fusion te |
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Based on information fusion technology rolling furnace temperature compensated pressure measurement
, Readings from the screen. (5) spurious RF power: In addition to its emission bandwidth around the carrier at the modulation component, but in the discrete frequency or narrow band with a significant component of the RF components, including harmonics and spurious non-harmonic components and parasitic components. Spurious RF power indicator: When the carrier frequency power ≤ 25w, stray RF power does not exceed 2.5gw. When the carrier frequency power> 25W, spurious RF power should be lower than the carrier frequency power 70dB. Hand-made spurious RF power station does not exceed 8gw. ① Add modulated signal, according to [SPAN] is set to 80kHz; RBW is set to re-10kHz; press [AMPLITUDE], menu selection (REFLEVEL) signal placed near the top of the screen, record carrier power level Pa. ② Press [FREQUENCY], menu selection (STARTFREQ) 30MHz, (PFREQ) 2 times the carrier frequency (except for necessary bandwidth), record the maximum power level Pb. Pa-Pb for the spurious RF power. 3.3 Measurement Problems in the work of modern measuring equipment in the high radio frequency band, with high technological content, high precision, high value, high quality, full-function features. As we trust and rely on its height, could easily lead to careless or ignore some of the measurement process. (1) calibration of measuring equipment we usually only pay attention to the standard equipment, measuring equipment and regular inspection, verification, attention to the measurement device with a self-test function. However, in testing other devices in the accuracy of the measurement system is easily overlooked, such as attenuation attenuator, the test RF connectors (RF cable, RF connector) to choose whether appropriate attenuation accuracy, etc. In addition, when we before the next test will fail to effectively reset the measuring instruments, may lead to measurement errors. (2) use the spectrum analyzer dynamic range of factors should be noted that, depending on the background noise and the maximum allowable input level. Input signal level to the first mixer ldB compression point below, if the level is too high can interfere with test results, reduce the scope of the intermodulation. The spectrum analyzer input signal level should take about a 10dBm, the measurement instrument as intelligent testing methods used to ensure the test is true and accurate. References [1】 LIU Guo. Guan Yin West. Electronic measurement. Machine Press Du. 20O3. About the author: Wang Shaonan. Male, senior engineer. Company: Hefei, Anhui Province Information Industry Department of Radio Management. Address: 230OOO Hefei Huaihe Road 256, (6th Floor, City). Received Time: 2O05-03-23 (on the next page the first l2) furnace temperature sensitivity coefficient of the pressure sensor a = 5.78 × 10 ~ oC. Pressure sensitivity coefficient ap = 1.4 × 10 ~ / Pa. With and without fusion than before, an order of magnitude performance improvement,[link widoczny dla zalogowanych], the sensor output is affected by temperature greatly reduced, while the impact of temperature is also reduced by the pressure of an order of magnitude. Seen by the steel rolling heating furnace pressure sensor information fusion, the temperature compensation, which is in rolling heating furnace to eliminate the health of interference by other factors in the impact of very effective. 4 Conclusion (1) rolling through the furnace operating conditions in the monitoring of multiple parameters and using certain information fusion can be achieved to improve the accuracy of each parameter purpose; (2) the use of data fusion technology to reflect the health of rolling heating furnace pressure sensor in the pressure parameters carried out a second sensor information fusion,[link widoczny dla zalogowanych], the temperature compensation, which is a single or a single class to eliminate the uncertainty of sensor to improve the reliability of measurement, to gain a more accurate measurement of the object has a very clear understanding effect. References [1] Macui Hong,[link widoczny dla zalogowanych], Guo Wella. Heating furnace pressure control method and conditions can be achieved [J]. Hebei Metallurgy. 1997. (2) :47-50. [2] Wang Ziyan. Thermal Energy and Power Engineering Testing Technology [M]. Xi'an: Xi'an Jiaotong University Press. 1998:86-87. [3] Kang Yao-hong. Data fusion theory and application [M]. Xi'an: Xidian University Press. 1997, l1: l-l2. [4] LIU Tong-ming, Xia Zuxun, Xie Hong Song,[link widoczny dla zalogowanych], information fusion technology and application [M]. Beijing: National Defence Industry Press. 1998,9: l-l7. [5] Liu Junhua. Intelligent sensor system [M]. Xi'an: Xidian University Press, 200O: l98-202. Author: Tang Wenwu, shellfish, lecturer, Master of Central South University. Company: Hunan Metallurgical Professional Technology College; Central South University Institute of Energy and Power Engineering. Address: 412000,[link widoczny dla zalogowanych], Zhuzhou City, Hunan. Received Time :2005 -05-25
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