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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5334是一个混合振动监测系统，由加速度传感器，放大器和2线（IEPE）电源单元组成，最大工作温度高达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
应用
1. High temperature industrial vibration monitoring
高温工业振动监测
2. High temperature turbine vibration measurements
高温涡轮振动测试
3. General purpose high temperature monitoring
通用高温监测
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.
订货型号
5443 振动监测系统
配件
Model 6535 mounting screws (8-32)
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