美国DT 7700A1高精度微型加速度传感器
Available with a 5g range, the Dytran model 7700A1 incorporates a MEMS capacitive sensing element and an advanced ASIC to simulate piezoresistive bridge operation, as well as an integrated VC accelerometer chip with high drive, low impedance buffering. Units respond to both DC and DC acceleration. On-board regulation minimizes supply voltage variation effects, making them relatively insensitive to temperature changes and thermal gradients. Sensors are hermetically sealed for reliable operation in high humidity and dirty environments, and feature a custom integrated circuit amplifier and differential output stages, with a 4-pin M4.5 x 0.35 radial connector and 10-32 stud mounting capabilities.
美国DT 7700A1高精度微型加速度传感器
The Dytran model 7700A1 accelerometer uses the same power supply as piezoresistive and strain gage sensors, allowing them to operate as stand-alone differential output accelerometers or in place of piezoresistive bridge-type accelerometers.
压电式加速度传感器又称压电加速度计。它也属于惯性式传感器。压电式加速度传感器的原理是利用压电陶瓷或石英晶体的压电效应,在加速度计受振时,质量块加在压电元件上的力也随之变化。当被测振动频率远低于加速度计的固有频率时,则力的变化与被测加速度成正比。
特性
1. 100 mV/g sensitivity
2. 5g range
3. 0 to 600 Hz frequency range (3dB)
4. 4-pin M4.5 x 0.35 radial connector
5. 10-32 tapped hole
6. 8 grams
7. Titanium
8. Hermetic
9. Differential output
10. MEMS technology
11. Same power supply requirements as strain gage sensors
12. DC response
基于的MEMS硅微加工技术,压阻式加速度传感器具有体积小、低功耗等特点,易于集成在各种模拟和数字电路中,广泛应用于汽车碰撞实验、测试仪器、设备振动监测等领域。
应用
1. Airbag testing
2. Crash testing
3. Flight testing
4. Ride quality
5. Seismic monitoring
电容式加速度传感器是基于电容原理的极距变化型的电容传感器。电容式加速度传感器/电容式加速度计是对比较通用的加速度传感器。在某些领域无可替代,如安全气囊,移动设备等。电容式加速度传感器/电容式加速度计采用了微机电系统(MEMS)工艺,在大量生产时变得经济,从而保证了较低的成本。
美国DT 7700A1高精度微型加速度传感器
参数
Weight, Max 0.28 oz 8.0 grams
Mounting Tapped Hole 10-32 UNF-2B 10-32 UNF-2B
Material Ti-6AI-4V Ti-6AI-4V Notes:
Input Range ±5 g ±49 m/s2
Sensitivity Differential, ±5% [1] 100 mV/g 10.2 mV/m/s2
Non-Linearity, Max [2] 0.5 % F.S 0.5 % F.S
Sensitivity Change with Excitation Voltage (6-22 Volts) 0.3 % 0.3 %
Cross Axis Sensitivity < 3 % < 3 %
Maximum Mechanical Shock (0.1 ms) ±2000 gpk ±19620 m/s2 peak
Bias Temperature Shift ,Max [3] 111 (ppm of span)/°F 200 (ppm of span)/°C
Sensitivity Temperature Shift -139 to +139 ppm/°F -250 to +250 ppm/°C
Operating Temperature Range -40 to +176 °F -40 to +80 °C
Seal Hermetic Hermetic
Output Common Mode Voltage ± VDC [4] [4]
Output Impedence,Nom 1225 Ω 1225 Ω
Operating Voltage ±3 to ±11 VDC ±3 to ±11 VDC
Operating Current, Max 13 mA Dc 13 mA Dc
Change in Operating Current to Excitation Voltage 0.25 mA/V 0.25 mA/V
伺服式加速度传感器是一种闭环测试系统,具有动态性 能好、动态范围大和线性度好等特点。其工作原理,传感器的振动系统由 "m-k”系统组成,与一般加速度计相同,但质量m上还接着一个电磁线圈,当基座上有 加速度输入时,质量块偏离平衡位置,该位移大小由位移传感器检测出来,经伺服放大器 放大后转换为电流输出,该电流流过电磁线圈,在磁铁的磁场中产生电磁恢复力,力图使质量块保持在仪表壳体中原来的平衡位置上,所以伺服加速度传感器在闭环状态下工作。由于有反馈作用,增强了抗干扰的能力,提高测量精度,扩大了测量范围,伺服加速度 测量技术广泛地应用于惯性导航和惯性制导系统中,在高精度的振动测量和标定中也有应用。