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(yīng)工作的。某些晶體在一定方向上受力變形時(shí)，其內(nèi)部會產(chǎn)生極化現(xiàn)象，同時(shí)在它的兩個(gè)表面上產(chǎn)生符號相反的電荷；當(dāng)外力去除后，又重新恢復(fù)到不帶電狀態(tài)，這種現(xiàn)象稱為“壓電效應(yīng)”，具有“壓電效應(yīng)”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(xiàn)代生產(chǎn)生活中被應(yīng)用于許許多多的方面，如手提電腦的硬盤抗摔保護(hù)，目前用的數(shù)碼相機(jī)和攝像機(jī)里，也有加速度傳感器，用來檢測拍攝時(shí)候的手部的振動，并根據(jù)這些振動，自動調(diào)節(jié)相機(jī)的聚焦。壓電加速度傳感器還應(yīng)用于汽車安全氣囊、防抱死系統(tǒng)、牽引控制系統(tǒng)等安全性能方面。
美國Dytran的5334是一個(gè)混合振動監(jiān)測系統(tǒng)，由加速度傳感器，放大器和2線（IEPE）電源單元組成，工作溫度高達(dá)482℃。
The Dytran 5334 is a high temperature hybrid vibration monitoring system, consisting of a charge mode accelerometer and in-line miniature differential charge amplifier operating from a constant current 2-wire (IEPE) power unit, permanently joined together as a single unit with an interconnecting integral hardline cable.
The unique configuration of the Dytran model 5334 is known as a hybrid system because it combines both IEPE and charge mode piezoelectric technologies into a single operating unit. The accelerometer is connected to the input of the charge amplifier via an 18-inch long hardline cable (SiO2 insulated) which is unaffected by high temperatures at the point of measurement.
The model 5334 features a case isolated design to avoid EMI/ground loop interference, with hermetic sealing for reliable operation in high humidity and dirty environments. Units offer an industry standard tri-bolt mount, stainless steel construction, and incorporate the use of ultra high temperature piezoelectric crystals in compression mode for extremely stable operation at temperatures up to +900°F (+482°C).
特性
1. 10 mV/g sensitivity
2. 500g range
3. 4.8 to 660 frequency range (±5%)
4. 18-inch integral hardline cable assembly
5. Tri-bolt mount
6. 150 grams
7. Stainless steel
8. Hermetic
9. Case isolated
10. Integrated differential amplifier
11. Uniquely combines IEPE and charge output technology, seamlessly operating as a single unit
12. +900°F (+482°C) operation
13. IEPE
應(yīng)用
1. High temperature industrial vibration monitoring
高溫工業(yè)振動監(jiān)測
2. High temperature turbine vibration measurements
高溫渦輪振動測試
3. General purpose high temperature monitoring
通用高溫監(jiān)測
WEIGHT, including cables, accel and amplifier 150 grams
MOUNTING PROVISION Three-hole flange for #8 SCREWS
CABLE FROM ACCEL. TO CHG. AMP., (18 in LENGTH) 2-conductor shielded hardline cable
CONNECTOR FROM CHARGE AMPLIFIER D38999/25YA98PA
MATERIAL, ACCELEROMETER 304L CRES
PERFORMANCE (SYSTEM)
SENSITIVITY, ±5% [1] 10 mV/g
RANGE F.S. FOR ± 5 VOLTS OUTPUT ± 500 g
FREQUENCY RANGE, ± 5% 4.8 to 660 Hz
FREQUENCY RANGE, -3db 1.6 to 2000 Hz
RESONANT FREQUENCY, NOM. 35 kHz
EQUIVALENT ELECTRICAL NOISE FLOOR .01 grms
LINEARITY [2] ± 2% % F.S.
TRANSVERSE SENSITIVITY, MAX. 5 %
STRAIN SENSITIVITY @ 250 με .012 g/με
ENVIRONMENTAL
MAXIMUM VIBRATION ±600 gpk
MAXIMUM SHOCK ±2000 gpk
TEMPERATURE RANGE (ACCELEROMETER) -65 to +900 °F
TEMPERATURE RANGE (CHARGE AMPLIFIER) -50 TO +185 °F
SEAL, (ACCELEROMETER & CHG. AMP) HERMETIC Ceramic-to-metal and laser welded
COEFFICIENT OF THERMAL SENSITIVITY .02 %/oC
ELECTRICAL
SUPPLY CURRENT RANGE [3] 4 to 20 mA
COMPLIANCE VOLTAGE RANGE 15 to 30 Volts
OUTPUT IMPEDANCE, TYP. 100 Ohms
BIAS VOLTAGE, +8 VOLTS NOM. +7 to +9 VDC
DISCHARGE TIME CONSTANT, NOM. 0.1 Sec
OUTPUT SIGNAL POLARITY FOR ACCELERATION TOWARD TOP Positive
ELECTRICAL ISOLATION, GROUND WIRE TO CASE 10 Megohms, min.
訂貨型號
5443 振動監(jiān)測系統(tǒng)
配件
Model 6535 mounting screws (8-32)
相關(guān)型號
5334
5335
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