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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3309A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250℃。
The Dytran 3309A is a ring style high temperature piezoelectric charge mode accelerometer offering a high natural frequency and reliable operation in temperatures up to +482°F (+250°C).
Incorporating a unique single crystal piezoelectric sensing element operating in shear mode, the Dytran model 3309A is offered with a sensitivity of 5 pC/g. Units feature a radial 3-pin “Mighty Mouse™” 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 3309A is also hermetically sealed for use in demanding environments, and case isolated to avoid EMI/ground loop interference.
特性
1. 5 pC/g sensitivity
2. 5,000 Hz upper frequency range (±5%)
3. 3-pin "Mighty Mouse™" radial connector
4. Ø.17 thru hole mount
5. 25.5 grams
6. Stainless steel
7. Hermetic
8. Case isolated
9. 360° cable orientation
10. +482°F (+250°C) operation
11. Charge mode
应用
1. Commercial and military aircraft vibration monitoring
商用和军用飞机振动监测
2. Engine vibration monitoring
发动机振动监测
3. High performance engine analysis
高性能引擎分析
Weight 0.893 oz 25.5 grams
Mounting Provision Ø.16 Thru Hole Ø4.1 Thru Hole
Material 304L 304L
Sensitivity +/- 5%
Frequency Range, ± 3dB [2] - 15,000 [2] - 15,000
Frequency Range, ± 10% [2]-10,000 [2]-10,000 -60 -5
Frequency Range, ± 5% [2]-5,000 Hz
Linearity [3] ± 1 %F.S ± 1 %F.S 150 2.5
Transverse Sensitivity, Max. 5% 5% 300 5
Maximum Vibration 5,000 ±gpk 49000 ± m/s2 pk
Maximum Shock 10,000 ±gpk 98000 ± m/s2 pk
Temperature Range (Operational) ‐60 to +482 °F ‐55 to +250 °C
Coefficient Of Thermal Sensitivity 0.016 %/°F 0.032 %/°C
Base Strain Sensitivity 0.008 g/με 0.0784 m/s2 / με
Base Isolation (1000VDC, 1 minute, 20 sec. ramp)[4] >1 GΩ >10 GΩ
Capacitance, NOM at 75°F 280 pF 280 pF
Insulation Resistance, (across element) 75°F 1.00E+15 Ω 1.00E+15 Ω
订货型号
3309A
配件
Model 6238A2 mounting screw (8-32)
