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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(xiàn)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(tài)，這種現(xiàn)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(xiàn)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(shù)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(jù)這些振動，自動調節(jié)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(tǒng)、牽引控制系統(tǒng)等安全性能方面。
美國Dytran的3054B是一款微型兩軸加速度傳感器/振動傳感器，專為傳熱管橫向加速度測量二設計。
The Dytran 3054B is a unique, miniature biaxial accelerometer designed to be inserted up to 40 feet into 0.319 inches-diameter heat transfer tubes for the purpose of measuring transverse acceleration of the tube. The Dytran model 3054B uses 8 beryllium copper springs attached to the outside of the sensor body, to guide the unit into the tube and allow for slight variations in tube inside diameter and for some buildup of foreign materials inside the tube. Biaxial in design, model 3054B incorporates two quartz sensing elements operating in shear mode. Units are internally isolated from the sensor case and are enclosed by a faraday shield for electrostatic noise immunity. Alternate spring sizes available (up to .935 inches) to accomodate larger tube diameters; contact Dytran for details.
特性
1. 25 mV/g sensitivity
2. 200g range
3. 2 to 500 Hz frequency range (±10%)
4. 40-foot integral cable to flying leads
5. Mounts inside a single tubular housing
6. 7.2 grams
7. Stainless steel
8. Hermetic
9. Case isolated
10. Biaxial
11. IEPE
應用
1. Chillers in nuclear plants
核電站冷卻裝置
2. Cooling towers
冷卻塔
3. Large energy stations
大型能量站
4. Measures vibration in two axes while inserted in a tube
兩軸振動測量
5. Vibration measurements in heat transfer tubes in HVAC units
空調傳熱管的振動測量
WEIGHT 7.2 GRAMS
SIZE (DIA x LENGTH) ? 0.275 X 1.5 INCHES
MOUNTING [1] UNIT SLIDES INTO ?.319 MIN. I.D. TUBE ON SPRINGS
ELECTRICAL CONNECTION PROVISION 3-WIRE 40 FT. LONG CABLE W/FLYING LEADS
MATERIAL, HOUSING/CONNECTOR 304L STAINLESS STEEL
PERFORMANCE
SENSITIVITY, ± 10% [1] 25.0 mV/G
RANGE, F.S. (each axis) ± 200 G
FREQUENCY RESPONSE, ± 10% [2] 2 to 500 Hz
ELEMENT NATURAL FREQUENCY >30 kHz
EQUIVALENT ELECTRICAL NOISE .003 G, RMS
LINEARITY [3] 1 %F.S.
SIGNAL POLARITY SENSITIVE AXES ARE ORTHOGONAL AND TRANSVERSE
ENVIRONMENTAL
MAXIMUM VIBRATION +/- 600 G
MAXIMUM SHOCK 1000 G
TEMPERATURE RANGE -60 to +250 oF
ENVIRONMENTAL SEAL HERMETIC WITH BOOTED CABLE
COEFFICIENT OF THERMAL SENSITIVITY .03 %/oF
ENVIRONMENTAL
SUPPLY CURRENT RANGE, (each axis) [4] 2-to 20 mA
COMPLIANCE (SUPPLY) VOLTAGE RANGE (each axis) +18 to +30 VDC
OUTPUT IMPEDANCE, TYP. 100 OHMS
OUTPUT BIAS VOLTAGE +7 TO +9 VDC
DISCHARGE TIME CONSTANT 0.2 TO 1.0 SEC
GROUND ISOLATION [5] 10 MEGOHMS (MIN.)
訂貨型號
3054B
配件
Supplied Accessories: (1) model 6565A insertion rod adaptor (6-inches long), (1) model 6565A1 insertion rod extender (48-inches long)
相關型號
3211M1
3243A
3