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壓電式加速度傳感器，又稱振動傳感器，是基于壓電晶體的壓電效應工作的。某些晶體在一定方向上受力變形時，其內部會產生極化現象，同時在它的兩個表面上產生符號相反的電荷；當外力去除后，又重新恢復到不帶電狀態，這種現象稱為“壓電效應"，具有“壓電效應"的晶體稱為壓電晶體。常用的壓電晶體有石英、壓電陶瓷等，在現代生產生活中被應用于許許多多的方面，如手提電腦的硬盤抗摔保護，目前用的數碼相機和攝像機里，也有加速度傳感器，用來檢測拍攝時候的手部的振動，并根據這些振動，自動調節相機的聚焦。壓電加速度傳感器還應用于汽車安全氣囊、防抱死系統、牽引控制系統等安全性能方面。
美國Dytran的3045A4是一款微型加速度傳感器/振動傳感器，可連續在低至零下196攝氏度環境下正常工作，滿足低溫振動試驗要求。
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
應用
1. Cryogenic pump vibration measurements
低溫泵振動測量
2. Cryogenic industrial monitoring
低溫工業監測
3. Rocket engine vibration test stands
火箭發動機振動試驗臺
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
訂貨型號
3045A
配件
Recommended Accessories: model 4110C current source power unit
相關型號
3010M14
3306A1
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