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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3045A4是一款微型加速度传感器/振动传感器，可连续在低至零下196摄氏度环境下正常工作，满足低温振动试验要求。
The Dytran 3045A is an IEPE accelerometer with continuous operation to -320°F (-196°C), expressly designed to support cryogenic vibration testing requirements.
Offered with a 5 mV/g sensitivity, the design of model 3045A incorporates a two-pole low-pass filter, which aids in eliminating spurious high frequency data, and a rugged stainless steel construction, along with a 1/4-28 integral mounting stud and a 10-32 axial connector. Even at extreme temperatures, the model 3045A displays an extremely stable and continuous signal output. Units are hermetically sealed for reliable operation in high humidity and dirty environments. The accelerometer is also electrically isolated via use of an internal Faraday shield for noise immunity.
特性
1. 5 mV/g sensitivity
2. 1,000g range
3. 4.8 to 1,800 Hz frequency range (±5%)
4. 10-32 axial connector
5. 1/4-28 stud mount
6. 20 grams
7. Stainless steel
8. Hermetic
9. Case isolated
10. -320°F (-196°C) operation
11. Two-pole low pass filter
12. Stable Mosfet amplifier technology
13. IEPE
应用
1. Cryogenic pump vibration measurements
低温泵振动测量
2. Cryogenic industrial monitoring
低温工业监测
3. Rocket engine vibration test stands
火箭发动机振动试验台
Weight 0.70 oz 20 grams Notes:
Connector, Coaxial 10-32 10-32
Mounting Provision : Integral Stud 1/4 - 28 UNF-2A 1/4 - 28 UNF-2A
Material : Base, Cap, and Connector 300 Series S.S. 300 Series S.S. amplifier.
Element Material, Style Quartz, Shear Quartz, Shear
Sensitivity, ±5% [1] 5 mV/g 0.51 mV/m/s2
Range F.S for ± 5 Volts Output ±1000 g ± 9810 m/s2
Frequency Range ±3db 1.6 to 2500 Hz 1.6 to 2500 Hz
Filter Rolloff Rate 12 db/octave 12 db/octave
Filter Corner Frequency 2,500 Hz 2,500 Hz
Resonant Frequency >35 kHz >35 kHz
Noise floor 0.007 Grms 0.069 m/s2 rms
Linearity [2] ± 1% % F.S. ± 1% % F.S.
Maximum Transverse sensitivity 5 % 5 %
Strain Sensitivity 0.002 g/μσ 0.02 m/s2
Maximum Vibration ±1000 G's,peak ±9810 m/s2 peak
Maximum Shock ±2000 G's,peak ±19620 m/s2 peak
Temperature Range -320 to+300 °F -195 to +149 °C
Seal Hermetic Hermetic
Coeffiecient of Thermal Sensitivity .03 %/°F 0.05 %/°C
ELECTRICAL
Supply Current Range [3] 2 to 4 mA 2 to 4 mA
Compliance Voltage Range + 28 Volts + 28 Volts
Output Impedence,Typ 100 Ω 100 Ω
Bias Voltage +7.5 to +9.5 VDC +7.5 to +9.5 VDC
Discharge Time Constant 0.1 to 1.0 Sec 0.1 to 1.0 Sec
Output Signal Polarity for Acceleration Towards Top Positive Positive
Electrical Isolation, Ground (Pin B) to case( pin A) 10 GΩ,min 10 GΩ,min
订货型号
3045A
配件
Recommended Accessories: model 4110C current source power unit
