噪声等效功率

本文介绍了利用工作于Bragg衍射的Ge晶体声光调制器作为外差系统中的频移器来测量外差系统的噪声等效功率（NEP）的方法。

In this paper , the noise equivalant power ( NEP ) of optical heterodyne system has been measured with a method based on acousto - optici germanium ' crystal modulator working at Bragg diffraction mode as a frequency shifting device in heterodyne system .

着重叙述了高温超导检测器的噪声等效功率（NEP）灵敏度理论计算、检测器用超导结的技术设计（给指标确定）、高Tc台阶结的制备与结特性测试。

Then , this paper gives the theory calculation of sensitivity of detector which is determined by the noise equivalent power ( NEP ) 、 technical design of detector with high temperature superconductive junction and fabrication and measurement of junction characterization of HTSC step - edge junction .

光外差系统噪声等效功率的一种测量方法

Measurement of noise equivalent power of optical heterodyne system

横向热导限制的热释电探测器的噪声等效功率

Lateral heat conduction limited NEP of pyroelectric detectors

计算其灵敏度为2700pF/W、噪声等效功率为8.4×10-8W/Hz1/2和响应时间为0.5ms。

The device sensitivity is 2 700 pF / W , noise equivalent power is 8.4 × 10-8W / Hz1 / 2 and response time is 0.5 ms.

用辐射分布函数，求解热电晶体的温度分布；计算了热释电探测器的响应率和噪声等效功率，并把计算结果与实验结果进行比较。

Using the radiation distribution function , the temperature distribution in the pyroelectric crystal is equivalent power of pyroelectric detectors are computed and the result of the calculation is compared with the experiment .

当信号很强时，光子噪声占主导地位，信噪比（SNR）与信号水平不成正比，此时由信噪比导出噪声等效功率（NEP）和D时应格外小心。

When the signal is very strong , the photon noise predominates , signal to noise ratio is not directly proportional to signal level , and care must be exercised in deriving NEP and D from signal to noise ratio .