壓電式加速度傳感器，又稱振動(dòng)傳感器，是基于壓電晶體的壓電效應(yīng)工作的

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更新時(shí)間：2024-06-26

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壓電式加速度傳感器，又稱振動(dòng)傳感器，是基于壓電晶體的壓電效應(yīng)工作的。某些晶體在一定方向上受力變形時(shí)，其內(nèi)部會(huì)產(chǎn)生極化現(xiàn)象，同時(shí)在它的兩個(gè)表面上產(chǎn)生符號(hào)相反的電荷；當(dāng)外力去除后，又重新恢復(fù)到不帶電狀態(tài)，這種現(xiàn)象稱為“壓電效應(yīng)"，具有“壓電效應(yīng)"的晶體稱為壓電晶體。常用的壓電晶體有石英、壓電陶瓷等，在現(xiàn)代生產(chǎn)生活中被應(yīng)用于許許多多的方面，如手提電腦的硬盤抗摔保護(hù)，目前用的數(shù)碼相機(jī)和攝像機(jī)里，也有加速度傳感器，用來檢測(cè)拍攝時(shí)候的手部的振動(dòng)，并根據(jù)這些振動(dòng)，自動(dòng)調(diào)節(jié)相機(jī)的聚焦。壓電加速度傳感器還應(yīng)用于汽車安全氣囊、防抱死系統(tǒng)、牽引控制系統(tǒng)等安全性能方面。

美國Dytran的5334是一個(gè)混合振動(dòng)監(jiān)測(cè)系統(tǒng)，由加速度傳感器，放大器和2線（IEPE）電源單元組成，工作溫度高達(dá)482℃。

The Dytran 5334 is a high temperature hybrid vibration monitoring system, consisting of a charge mode accelerometer and in-line miniature differential charge amplifier operating from a constant current 2-wire (IEPE) power unit, permanently joined together as a single unit with an interconnecting integral hardline cable.

The unique configuration of the Dytran model 5334 is known as a hybrid system because it combines both IEPE and charge mode piezoelectric technologies into a single operating unit. The accelerometer is connected to the input of the charge amplifier via an 18-inch long hardline cable (SiO2 insulated) which is unaffected by high temperatures at the point of measurement.

The model 5334 features a case isolated design to avoid EMI/ground loop interference, with hermetic sealing for reliable operation in high humidity and dirty environments. Units offer an industry standard tri-bolt mount, stainless steel construction, and incorporate the use of ultra high temperature piezoelectric crystals in compression mode for extremely stable operation at temperatures up to +900°F (+482°C).

特性

1. 10 mV/g sensitivity

2. 500g range

3. 4.8 to 660 frequency range (±5%)

4. 18-inch integral hardline cable assembly

5. Tri-bolt mount

6. 150 grams

7. Stainless steel

8. Hermetic

9. Case isolated

10. Integrated differential amplifier

11. Uniquely combines IEPE and charge output technology, seamlessly operating as a single unit