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压电式加速度传感器，又称振动传感器，是基于压电晶体的压电效应工作的。某些晶体在一定方向上受力变形时，其内部会产生极化现象，同时在它的两个表面上产生符号相反的电荷；当外力去除后，又重新恢复到不带电状态，这种现象称为“压电效应”，具有“压电效应”的晶体称为压电晶体。常用的压电晶体有石英、压电陶瓷等，在现代生产生活中被应用于许许多多的方面，如手提电脑的硬盘抗摔保护，目前用的数码相机和摄像机里，也有加速度传感器，用来检测拍摄时候的手部的振动，并根据这些振动，自动调节相机的聚焦。压电加速度传感器还应用于汽车安全气囊、防抱死系统、牵引控制系统等安全性能方面。
美国Dytran的3221C是一款高温型加速度传感器/振动传感器，具有体积小、结构坚固，高密封、耐高温等特点，高频率，最大工作温度高达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. Ø.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
应用
1. Aerospace and flight testing
航空航天与飞行试验
2. High temperature vibration measurements on small structures and objects
小物体高温振动测试
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
订货型号
3221C 高温型
3221C2 高温型
配件
Model 6297 mounting screw (6-32)
