壓電式加速度傳感器，又稱振動傳感器，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，其內(nèi)部會產(chǎn)生極化現(xiàn)象，同時在它的兩個表面上產(chǎn)生符號相反的電荷；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，用來檢測拍攝時候的手部的振動，并根據(jù)這些振動，自動調(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3221C是一款高溫型加速度傳感器/振動傳感器，具有體積小、結(jié)構(gòu)堅固，高密封、耐高溫等特點，高頻率，工作溫度高達(dá)260℃。
The Dytran 3221C is a ring style high temperature piezoelectric charge mode accelerometer offering a high natural frequency and reliable operation in temperatures up to +500°F (+260°C).
Incorporating a unique single crystal piezoelectric sensing element operating in shear mode, the Dytran model 3221C is offered with a sensitivity of 10 pC/g. Units feature a radial 10-32 side connector, as well as a miniature thru hole design, allowing the sensor to be turned 360° prior to securing, aiding the user during sensor installation. The model 3221C is also hermetically sealed for use in demanding environments, and base isolated to avoid EMI/ground loop interference.
特性
1. 10 pC/g sensitivity
2. 10,000 Hz upper frequency range (±10%)
3. 10-32 side connector
4. ?.140 thru hole mount
5. 9.0 grams
6. Titanium
7. Hermetic
8. Base isolated
9. 360° cable orientation
10. +500°F (+260°C) operation
11. Charge mode
應(yīng)用
1. Aerospace and flight testing
航空航天與飛行試驗
2. High temperature vibration measurements on small structures and objects
小物體高溫振動測試
Weight, Max 0.32 oz 9.0 grams
Sensitivity, +/-20% [2] [3] 10 pC/g 1.02 pC / m/s2
Range F.S +/-500 g +/-4900 m/s2
Frequency Response, +/- 10% [5] to 10000 Hz [5] to 10000 Hz
Mounted Resonant Frequency kHz >kHz
Amplitude Non-Linearity 1 %F.S MAX 1 %F.S MAX
Transverse Sensitivity, Max 5 % 5 %
Strain Sensitivity @250/μσ 0.08 g/με 0.78 m/s2 /με
ENVIRONMENTAL
Maximum Vibration 700 g rms 6860 m/s2 rms
Maximum Shock 5000 g 49000 m/s2
Temperature Range -60 to +500 °F -51 to + 260 °C
Environmental Seal Hermetic Hermetic
ELECTRICAL
Output Signal Polarity Positive Positive
Case Grounding Case is grounded Case is grounded
Base Grounding Base is isolated Base is isolated
訂貨型號
3221C 高溫型
3221C2 高溫型
配件
Model 6297 mounting screw (6-32)
相關(guān)產(chǎn)品
3235C1
3255C
