電子信息工程外文資料翻譯---壓電式加速度傳感器及其應(yīng)用-電子信息-文庫(kù)吧
2025-04-16 20:51 本頁(yè)面
【正文】 ructure, shear can make it very small, high resonance frequency accelerometer, the ring of quality stuck to pack in the center of the ring on the pillar piezoelectric element. Due to the binder will increased with temperature bee soft, so the highest working temperature is limited. Three, the piezoelectric acceleration sensor amplitude frequency characteristics The use of accelerometer ceiling depends on the amplitude frequency curve frequency resonant frequency map (figure ). General small damping (z = ) of the accelerometer, upper limit for the resonant frequency if the frequency of a third, can guarantee amplitude error is less than 1 dB (12%)。 If take for 1/5 of the resonant frequency are guaranteed amplitude error is less than dB (6%), and phase shift less than 30. But the resonant frequency and accelerometer fixed condition, accelerometer related factory the amplitude frequency curve is given in the rigid connection get fixed. Of the actual use of the fixed method is often difficult to reach, and rigid connection resonance frequency and use frequency will cap fell. The accelerometer and specimen of fixed method is shown in figure . Figure a of the steel bolt, is to make the resonant frequency can achieve the best way out of the resonant frequency. Bolt may not all shake screw holes into the base, lest cause base deformation, the influence of the accelerometer outputs. In the installation of layer of the tu yi on silicon grease can increase the uneven surface of the installation of the connection reliability. Need can be used when insulation insulation bolts and mica washer to fixed accelerometer (figure b), but the gasket should try to book. With a layer of book the wax accelerometer glued to the specimen surface smooth (figure c), also can be used in low temperature (40 ℃ below) occasion. Handheld probe measurement vibration methods (figure d) on a multipoint test very convenient use, but the measurement error is bigger, repeatability, use frequency generally poor cap is not higher than 1000 Hz ac. Use special permanent mags fixed accelerometer (figure e), easy to use, many in the low frequency measurement in use. This method also can make the accelerometer specimens and insulation. With rigid adhesive bolts (figure f) or adhesive (figure g) fixed method also long use. Some typical accelerometer with the above the resonant frequency of fixed method respectively for: steel bolts about law 31 kHz, mica gaskets 28 kHz, besmear book 29 kHz, the layer of wax with law 2 kHz, permanent mags fixed law 7 kHz. Four, the piezoelectric acceleration sensor sensitivity The piezoelectric accelerometer, the sensitivity of piezoelectric accelerometer is power type, can see it as a sensor voltage source or charge source, the sensitivity and charge voltage sensitivity has two said method. The sensitivity The former is the accel
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