常用的微弱信号检测方法都基于信号具有周期性、相关性,而噪声具有随机非相

常用的微弱信号检测方法都基于信号具有周期性、相关性,而噪声具有随机非相关性, 所以可采用相关检测技术把信号和噪声区分出来。若采用模拟技术实现,则先将信号经过放大,再利用锁定放大器与参考通道信号完成相关运算。锁定放大器的使用范围很广, 适于对淹没于噪声背景中的正弦信号的检测,因此锁定放大器在微弱信号检测领域有着极其重要的应用,其核心部分是相敏检测器。相敏检测器本质上是一种利用乘法器和积分器实现互相关检测的仪器,不但可以鉴幅,还可实现鉴相功能。

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结果 (英语) 1: [复制]

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The commonly used weak signal detection methods are based on the periodicity and correlation of the signal, and the random non-correlation of the noise, so the correlation detection technology can be used to distinguish the signal from the noise. If the analog technology is used, the signal is amplified first, and then the lock-in amplifier is used to complete the correlation operation with the reference channel signal. The lock-in amplifier has a wide range of applications and is suitable for the detection of sinusoidal signals submerged in the noise background. Therefore, the lock-in amplifier has an extremely important application in the field of weak signal detection, and its core part is a phase-sensitive detector. The phase sensitive detector is essentially an instrument that uses multipliers and integrators to realize cross-correlation detection, which can not only detect amplitude, but also realize the function of phase detection.

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结果 (英语) 2:[复制]

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The commonly used weak signal detection methods are based on the periodicity and correlation of the signal, while the noise has random non correlation, so the correlation detection technology can be used to distinguish the signal from the noise. If the analog technology is adopted, the signal is amplified first, and then the lock-in amplifier and the reference channel signal are used to complete the relevant operation. Lock-in amplifier has a wide range of applications and is suitable for the detection of sinusoidal signals submerged in noise background. Therefore, lock-in amplifier has an extremely important application in the field of weak signal detection, and its core part is phase sensitive detector. Phase sensitive detector is essentially an instrument that uses multiplier and integrator to realize cross-correlation detection. It can not only distinguish amplitude, but also realize phase discrimination.

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结果 (英语) 3:[复制]

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Commonly used weak signal detection methods are based on the periodicity and correlation of signals and random non-correlation of noise, so correlation detection technology can be used to distinguish signals from noise. If the analog technology is used, the signal is amplified first, and then the lock-in amplifier and the reference channel signal are used to complete the correlation operation. Lock-in amplifier is widely used, which is suitable for detecting sinusoidal signals submerged in noise background. Therefore, lock-in amplifier has extremely important application in weak signal detection field, and its core part is phase-sensitive detector. Phase-sensitive detector is essentially an instrument that uses multiplier and integrator to realize cross-correlation detection, which can not only identify amplitude, but also realize phase discrimination.

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