光电倍增管

A backscatter fiber is used to expand the width of laser pulse. A locking filter is added to dual F-P etalon. Photo Multiplier Tube is used to detect the intensity of light and a frequency tracking circuitry is designed.

使用散射光纤对激光脉宽进行扩展，在双通道标准具的基础上增加专用于频率跟踪的通道，使用光电倍增管检测光强，设计制作了基于采样的频率跟踪电路。

The hardware included helicon wave antenna and focusing system.

其中硬件系统主要包括：螺旋波天线和辉光聚焦系统的设计；PCL-818HG数据采集卡输出的+5V稳定信号，经过分压电阻和三极管后，作为数控器的外部启动/停止信号，控制步进电机带动光谱仪转动；另外，为了减小光电倍增管的噪声，单独为其提供了稳定的高压直流电源。

It is testified that the noise of image intensifier can be tested accurately and intuitively by this method.

在此基础上提出了采用光电倍增管来测试像增强器信噪比的方法。

Every light-proof detector consists of a plastic scintillator, a wavelength shifter and a photomultiplier tube.

每件探测器是由一块塑胶闪烁器、一条波长变换器和一个光电倍增管组成，并加以密封。

The tube consists of a light-sensitive cathode that emits electrons in proportion to the photons striking it.

光电倍增管有一个对光敏感的阴极，它发射的电子数目与撞击到其上面的光子数量成正比。

At the same time, the fluorescence lifetime of Eu3+ chelates was studied by using PMT and oscillograph.

同时，利用光电倍增管和示波器，研究了铕离子及其螯合物的荧光寿命。

The measurement results of the avalanche photodiode and the photomultiplier tube are compared, the similar accuracy was obtained.

同时比较了雪崩二极管和光电倍增管的测量结果，两者的测量精度相当。

This spectrophotometer can detect a weakreflectance signal as a photomultiplier tube substitutes for a photoelectric cell as the detector.

以高灵敏度的光电倍增管替代光电管作为检测器，这样对微弱的反射光信号能够实施有效的检测。

Precise testing method of faint optical signal comes into being while multiplier phototube appears with low noise and high gain.

随着低噪声、高增益的光电倍增管的出现，比较精确地测量微弱光信号成为可能。

Image intensifier ; multiplier phototube ; testing of noise.

像增强器；光电倍增管；噪声检测

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。