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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3218C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，用于广，可靠性好，最大工作温度高达482℃。
The Dytran 3218C is a high temperature piezoelectric differential output accelerometer offering extreme measurement stability and reliable surface vibration measurement capabilities over a wide temperature range of up to +900°F (+482°C).
The highly rugged design of the Dytran model 3218C incorporates the use of ultra stable quartz material within its self-generating seismic element. Sensing elements are housed in a hermetically sealed, case isolated, stainless steel construction, and are packaged with an integral two-foot hardline cable assembly with glass-to-metal sealed connector.
Industry standard tri-bolt mounting is achieved via use of three factory supplied 8-32 x 1.5-inch long socket head cap screws.
特性
1. 1.6 pC/g sensitivity
2. 10,000 Hz upper frequency range (±10%)
3. Integral 2-foot hardline cable assembly to D38999 output connector
4. Tri-bolt mount
5. 157 grams
6. Stainless steel
7. Hermetic
8. Case isolated
9. +900°F (+482°C)
10. Differential output
11. Charge mode
应用
1. Turbine vibration monitoring
涡轮发动机振动监测
2. General purpose high temperature vibration monitoring
高温振动监测
Weight Accelerometer 5.5 oz 157 grams
Accelerometer and cable 6.83 oz 195 grams
Size, (Mounting dia x Height x Length) Height 0.77 inches 19.43 mm
Mounting dia Ø1.19 inches Ø30.20 mm
Length 18.10 - 18.60 inches 459.70 - 472.40 mm
Connector [1] Material 304 L 304 L
Type 3 Pin 3 Pin
Housing Material 304 L 304 L
Isolation Pins to Housing 10GΩ MIN 10GΩ MIN
Sensing Element Material LGT LGT
Sensitivity [2] 1.6 pC/g 0.16 pC/m/s
Acceleration Range [3] g peak [3] m/s2 peak
Frequency Range, ±10% [4] -10,000 Hz [4] -10,000 Hz
Resonance Frequency > 35 kHz > 35 kHz
TYPICAL TEMPERATURE RESPONSE
Transverse Sensitivity 5 % 5 %
Insulation Resistance (75F) 10 GΩ 10 GΩ
Insulation Resistance (400F) 10 GΩ 10 GΩ
Insulation Resistance (700F) 3.5 MΩ 3.5 MΩ
Insulation Resistance (900F) 485 kΩ 485 kΩ
Operating Temperature -60 to 900 °F -51 to 482 °С
Capacitance, pin to pin 80 pF 80 pF
Unbalance between pins <2 pF <2 pF
Linearity 1 % 1 %
ENVIRONMENTAL
Maximum Vibration 1000 Gpeak 9810 m/s2 peak
Maximum Shock 2000 Gpeak 19620 m/s2 peak
Seal Hermetic Hermetic
Magnetic Sensitivity at 100 Gauss 0.00007 g/Gauss 0.00069 m/s2 Gauss
Base Strain Sensitivity 0.05 g/μ 0.4905 m/s2/μ
订货型号
3218C
配件
Model 6535 mounting screws (8-32)
