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针对固体发动机羽烟透过率面阵测量系统的测试要求,设计开发了两种不同的峰值保持电路。其中激光和红外光通道采用峰值保持芯片PKD01代替由比较器和取样保持器组成的峰值保持电路,降低了由于比较器转换状态延迟和保持电压下降所导致的误差。对于可见光通道,由于经光电转换后的电压信号为窄脉冲小信号,为了降低峰值保持电路中二极管对小信号的非线性误差,先对信号进行了前置放大;为了保证低电压下降率,采用了前置峰值保持电路与PKD01相结合;为了保证高压摆率,选用肖特基二极管和聚酯薄膜电容组成前置峰值保持电路。测量结果表明,经过改进的峰值保持电路可以稳定、快速、准确地保持面阵烟雾透过率测量系统中各路的电压信号。
According to the testing requirements of solid-engine plume penetration measurement system, two different peak-hold circuits were designed and developed. One of the laser and infrared channels using peak hold chip PKD01 instead of the comparator and sample and hold circuit to maintain the peak hold circuit, reducing the state transition due to the comparator delay and hold voltage drop caused by the error. For the visible channel, the voltage signal after the photoelectric conversion is a narrow-pulse small signal. In order to reduce the nonlinear error of the small-signal diode in the peak-hold circuit, the signal is pre-amplified first. In order to ensure the low voltage drop rate, Pre-peak hold circuit and PKD01 combination; in order to ensure high slew rate, the choice of Schottky diodes and polyester film capacitors form the front peak hold circuit. The measurement results show that the improved peak hold circuit can stably, quickly and accurately maintain the area array of smoke transmittance measurement system of the voltage signal.