基于多测点环境下的增益可调ICP调理电路设计

Designing of Adjustable Gain Circuit for ICP Based on Multi-point Environment

冲击波超压随弹药当量和测试半径大小变化显著,近距离与远距离测点的超压峰值可达数倍之差。为准确获取超压值,需在不同测试半径布置测点,且爆炸冲击波具有初值高、衰减快、上升时间短的特点,常用ICP压电式压力传感器来测试冲击波参数。针对现有ICP传感器的单一增益调理电路难以满足多测点的实验要求、在不同测试半径存在测试误差和灵活性差等问题,提出一种基于多测点环境的增益可调的ICP调理电路,实现了8档可调增益,增益精度均在1%以内。电路可靠性、灵活性在多测点冲击波测试中得到了验证,有效减少了由测试半径不同引起的测试误差。

Shockwave overpressure changed significantly with ammunition and equivalent radius, overpressure peak between close distance point and remote distance point can be up to several times difference. To accurately obtain overpressure, measuring points can be arranged in different radius. Shockwave has the characteristic of high initial, high attenuation and fast rise time. ICP piezoelectric pressure sensor was used to test the shock wave parameters commonly. Gain for a single existing ICP sensor conditioning circuit was difficult to meet the test requirements of multi-point, some problems such as test error and poor flexibility exist in different testing radius, a programmable gain increasing ICP sensor conditioning circuit was proposed, which has the 8-speed adjustable gain and the gain accuracy is less than 1%.Circuit reliability and flexibility were verified in a multi-point shock test, thus reducing the testing error caused by the test of different radius.