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，其內(nèi)部會產(chǎn)生極化現(xiàn)象，同時在它的兩個表面上產(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5335是一個混合振動監(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 5335 is a high temperature hybrid vibration monitoring system, consisting of a paired differential charge mode accelerometer and in-line miniature differential charge amplifier, operating from a constant current 2-wire (IEPE) power unit, and permanently joined together as a single unit with interconnecting hardline cable.
The unique configuration of the Dytran model 5335 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 then connects to a soft-line Teflon™ insulated cable assembly. The hardline cable assembly is unaffected by high temperatures at the point of measurement.
The model 5335 features a case isolated design to avoid EMI/ground loop interference, with hermetic sealing for reliable operation in high humidity and dirty environments. It has an industry standard tri-bolt mount, stainless steel construction, and utilizes ultra high temperature piezoelectric crystals in compression mode for extremely stable operation in temperatures up to +900°F (+482°C).
特性
1. 10 mV/g sensitivity
2. 500g range
3. 18-inch integral hardline cable assembly
4. Tri-bolt mount
5. 400 grams
6. Stainless steel
7. Hermetic
8. Case isolated
9. Integrated differential amplifier
10. Uniquely combines IEPE and charge output technology, seamlessly operating as a single unit
11. +900°F (+482°C) operation
12. IEPE
應(yīng)用
1. Aircraft turbine measurements
飛行器渦輪測試
2. High temperature turbine vibration measurements
高溫渦輪機(jī)振動測試
3. Ultra high temperature industrial monitoring
超高溫工業(yè)監(jiān)測
4. General purpose ultra high temperature vibration monitoring
高溫振動監(jiān)測
Weight, including cables,accel and amplifier 14 oz 400 grams
Size Acclerrometer Case Length 1.2 Inches 30 mm
Case Width 1.3 Inches 34 mm
Case Height 0.8 Inches 19 mm IC charge amplifier.
Charge Amplifier Case length 4.4 Inches 113 mm
Diameter ? 0.63 Inches ? 16 mm
Cable from accel. To chg.amp., Length 52.4 Inches 1331 mm
Mounting provision, Three -hole flange for 8-32 UNC-2A Screws 8-32 UNC-2A Screws
Connector from charge amplifier D38999/25YA98PA D38999/25YA98PA
Housing Material 304L 304L
Sensitivity, ±5% [1] 10 mV/g 1.02 mV/m/s2
Range F.S for ± 5 Volts Output ±500 g
Frequency Range, ±5% 4.8 to 1400 Hz 4.8 to 1400 Hz
Frequency Range, -3db 1.6 to 4200 Hz 1.6 to 4200 Hz
Resonant Frequency, Nominal 35 kHz 35 kHz
Equivalent Electrical Noise Floor 0.015 Grms 0.147 m/s2 rms
Linearity [2] ± 2% % F.S. ± 2% % F.S.
Maximum Transverse sensitivity 5 % 5 %
Strain Sensitivity @ 250 με 0.012 g/με 0.117 m/s2/με
ENVIRONMENTAL
Maximum Vibration ±600 g's,peak ±5886 m/s2 peak
Maximum Shock ±2000 g's,peak ±19620 m/s2 peak
Temperature Range (Acclerometer) -65 to 900 °F -54 to 482 °C
Temperature Range (Charge Apmlifier) -50 to 185 °F -45 to 85 °C
Seal, (Acclerometer & chg.amp) Hermetic Hermetic
Coefficient of Thermal Sensitivity 0.02 %/°F 0.02 %/°C
Electrical
Supply Current Rnge [3] 4 to 20 mA 4 to 20 mA
Complaince Voltage Range 15 to 30 Volts 15 to 30 Volts
Output Impedence,Typ 100 Ω 100 Ω
Bias Voltage +7 to +9 VDC +7 to +9 VDC
Discharge Tme Constant, Nom 0.1 Sec 0.1 Sec
Output Signal Polarity for Accleration Towards Top Positive Positive
Electrical Isolation,Ground Wire to Case 10 GΩ,min 10 GΩ,min
訂貨型號
5355 高溫加速度傳感器
配件
Model 6535 mounting screws (8-32)
相關(guān)型號
5334 高溫加速度傳感器
