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壓電式加速度傳感器，又稱(chēng)振動(dòng)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(huì)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(hào)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(chēng)為“壓電效應(yīng)"，具有“壓電效應(yīng)"的晶體稱(chēng)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(pán)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(lái)檢測(cè)拍攝時(shí)候的手部的振動(dòng)，并根據(jù)這些振動(dòng)，自動(dòng)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(chē)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(guó)Dytran的3225E是一款高溫型加速度傳感器/振動(dòng)傳感器，具有體積小、結(jié)構(gòu)堅(jiān)固，高密封、耐高溫等特點(diǎn)，靈敏度1.8pC/g，工作溫度高達(dá)177℃。
The Dytran 3225E is an ultra miniature teardrop low profile charge mode accelerometer with a sensitivity of 1.8 pC/g designed to mount in spaces inaccessible to other types of accelerometers. The sensor features a height of 0.15 inches (3.8 millimeters) and an overall weight of just 0.6 grams.
The sensors are designed to reliably operate in high temperatures up to +350°F (+177°C) and feature a ceramic shear sensing element in a lightweight laser welded titanium housing, with a three-foot integral cable terminating to a 10-32 jack.
The model 3225E is a member of the Dytran 3225E series of charge mode accelerometers. All units within the series have a sensitivity of 1.8 pC/g and adhesive mounting capabilities. They differ only in terms of their type of connector, environmental seal and electrical isolation.
特性
1. 1.8 pC/g sensitivity
2. 10,000 Hz upper frequency range (±10%)
3. Integral 3-foot cable assembly
4. Adhesive mount
5. 0.6 grams
6. Titanium
7. Ultra miniature teardrop design
8. +350°F (+177°C) operation
9. Charge mode
應(yīng)用
1. Environmental Stress Screening (ESS)
環(huán)境應(yīng)力篩選
2. Mechanical shock
機(jī)械沖擊
3. PC board vibration measurements
印刷電路板振動(dòng)測(cè)試
4. Product response testing
產(chǎn)品響應(yīng)測(cè)試
5. General purpose vibration measurements where space is at a premium
通用振動(dòng)測(cè)試
WEIGHT 0.6 GRAMS
SIZE (DIA x LENGTH HEX x HEIGHT) 0.25 x 0.36 x .150 INCHES
MOUNTING PROVISION FLAT MOUNTING SURFACE FOR ADHESIVE MOUNT
CONNECTOR, COAXIAL 10-32 JACK AT END OF FIXED 3 FT. CABLE
CASE MATERIAL TITANIUM
SENSING ELEMENT PLANAR SHEAR PIEZOCERAMIC
PERFORMANCE
SENSITIVITY, ±20% [2] [3] 2.0 pC/G
FREQUENCY RESPONSE, ± 10% [3] to 10,000 Hz
MOUNTED RESONANT FREQUENCY, NOM. 40 kHz
AMPLITUDE NON-LINEARITY (ZERO BASED BEST FIT ST.LINE METHOD) 2.0 % F.S., MAX.
TRANSVERSE SENSITIVITY, MAX. 5 PERCENT
STRAIN SENSITIVITY .0005 G's PER MICROSTRAIN @ 250/??
ENVIRONMENTAL
MAXIMUM VIBRATION 400 G's, RMS
MAXIMUM SHOCK 5000 G's, PEAK
TEMPERATURE RANGE -60 TO 350 oF
MAXIMUM SURVIVAL TEMPERATURE +400 oF
THERMAL COEFFICIENT OF SENSITIVITY SEE CHART BELOW
ENVIRONMENTAL SEAL EPOXY
ELECTRICAL
CAPACITANCE INCLUDING ATTACHED 3 FT CABLE 490 pF
INSULATION RESISTANCE @ R.T. 5 X 10 8 MIN. OHMS
OUTPUT SIGNAL POLARITY FOR ACCELERATION TOWARD TOP NEGATIVE GOING
CASE GROUNDING CASE IS GROUNDED
訂貨型號(hào)
3225E 高溫型
3225E1 高溫型
3225E2 高溫型
3225E3 高溫型
配件
1. Model 6298 small petro mounting wax, (1) model 6591A installation removal wrench, (1) model 6003A03 cable assembly
2. Model 4110C current source power unit, 4705M series in-line charge amplifier (10-32 jack to BNC jack), 4751B series in-line charge amplifier (10-32 jack to 10-32 jack)
3. 電纜6013A, 6019A
相關(guān)型號(hào)
3225M40 高溫型
3225M5 微型
3225M7 微型
3225M23T 微型TEDS
3225M24T 微型TEDS
3225M34T 微型TEDS
3225M36 微型
3224M37T 微型
3225M39 微型
3225F 微型
3225F1 微型
3225F2 微型
3225F3 微型
3225F4 微型
3225F5 微型
3225F6 微型
3225F7 微型
3225F1T 微型TEDS
3225F2T 微型TEDS
3225F3T 微型TEDS
3225F4T 微型TEDS
3225F5T 微型TEDS
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