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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3326A1是一款低噪微型加速度传感器/振动传感器，飞行试验应用的不二之选，能兼容 +20 到 +32 VDC范围的供电。
The Dytran 3326A1 is a low noise accelerometer, ideally suited for use in flight testing applications, and is compatible with standard on-board power supplies (+20 to +32 VDC). Sensors are part of Dytran’s line of VDC powered instrumentation, and as such, may be compatible with existing installations of other manufacturer’s which use similar principles.
Available with a sensitivity of 10 mV/g, the Dytran model 3326A1 features a ceramic sensing element operating in shear mode, packaged in a rugged titanium housing. Design of the 3326A1 incorporates a 1/4-28 4-pin radial connector and miniature thru hole mounting, which allows for the sensor to be turned 360° prior to securing, aiding the user during sensor installation. The Dytran model 3326A1 weighs 10 grams, is hermetically sealed for reliable operation in high humidity and dirty environments, and case isolated to avoid EMI/ground loop interference.
特性
1. 10 mV/g sensitivity
2. 500g range
3. 4 to 2,000 Hz frequency range (±5%)
4. 1/4-28 4-pin radial connector
5. Ø.14 thru hole mount
6. 10 grams
7. Titanium
8. Hermetically sealed
9. Case isolated
10. 360° cable orientation
11. Compatible with standard aircraft on-board power supplies (+20 to +32 VDC)
应用
1. Flight testing
飞行试验
2. Commercial and military aircraft vibration monitoring
商用和军用飞行器振动监测
Weight, Max 0.35 oz 10 grams
Sensitivity +/- 10% [1] 10 mV/g 1.02 mV/ m/s2
Range F.S. For ± 5 Volts Output ± 500 g pk ± 4905 m/s2
Frequency Range, ± 5% 4 to 2000 Hz 4 to 2000 Hz specifications without notice.
Resonant Frequency > 31 kHz > 31 kHz
Equivalent Electrical Noise Floor 0.0004 g rms 0.05 m/s2 rms
Linearity [2] ± 1% %F.S ± 1% %F.S
Transverse Sensitivity, Max. 5% 5%
Strain Sensitivity @250με 0.011 g/με 0.11 m/s2με
ENVIRONMENTAL
Maximum Vibration 500 ±gpk 4905 ± m/s2 pk
Maximum Shock 4000 ±gpk 39240 ± m/s2 pk
Temperature Range -60 to +225 °F -51 to 107 °C
Seal Hermetic Hermetic
Coefficient Of Thermal Sensitivity 0.033 %/°F 0.059 %/°C
Magnetic Sensitivity @ 100 Gauss (0,01 Tesla) 0.000012 g/Gauss 1.18 m/s2 /T
ELECTRICAL
Supply Current [3] <6 mA <6 mA
Compliance Voltage Range +20 to +32 V +20 to +32 V
Output Impedance TYP 100 Ω 100 Ω
Bias Voltage +11 to +13 VDC +11 to +13 VDC
Discharge Time Constant 0.1 to 1.0 sec 0.1 to 1.0 sec
Output Signal Polarity [4] positive positive
Electrical Isolation [5] 10 GΩ 10 GΩ
订货型号
3326A1机载型加速度传感器
3326A2机载型加速度传感器
配件
(1) model 6247 mounting screw (6-32)
Compatible Cables: 6937A
