Weak signal detection device with strong anti-interference performance

A weak signal detection, anti-interference technology, applied in the direction of instruments, computer control, simulators, etc., can solve the problem of weak signal detection, etc.

Pending Publication Date: 2020-04-17
中国电波传播研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because the measured signal is weak, the background noise of the sensor, the inherent noise of the amplifier circuit and the measuring instrument, and the external interference noise are often much larger than the amplitude of the useful signal. Th...

Method used

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  • Weak signal detection device with strong anti-interference performance
  • Weak signal detection device with strong anti-interference performance
  • Weak signal detection device with strong anti-interference performance

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0026] Example 1, such as figure 2 As shown, in the detection device disclosed in this embodiment, the received signal converted by the converter is firstly amplified by the first-stage low-pass filter circuit and then amplified by the pre-low noise amplifier circuit, and then the amplified signal is amplified by the lock-in amplifier. Chopping modulation, modulation to a certain frequency (this frequency is determined by the square wave generating circuit) and then high-pass filtering, at this time, the DC voltage bias can be removed again, and then the signal is restored by the demodulator, and then passed through the multi-channel amplification circuit , the signal is amplified by different times, and then enters the AD acquisition circuit after passing through the low-pass filter circuit. Filtering, finally adopts CAN communication protocol, transmits to the upper computer software through the CAN box, and displays the curves of each channel in real time. The host comput...

Embodiment 2

[0027] Example 2, such as image 3 As shown, once the amplification circuit multiple in embodiment 1 is determined, it can only be changed by changing the circuit resistance. Embodiment 2 is to replace the amplification circuit in Embodiment 1 with a program-controlled amplification circuit, which is convenient to change the amplification factor in real time by sending commands from the host computer.

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PUM

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Abstract

The invention discloses a weak signal detection device with strong anti-interference performance, the weak signal detection device comprises a filter circuit, a pre-amplification circuit, a lock-in amplifier, a multi-channel amplification circuit, a multi-channel AD acquisition circuit, a DSP, a CAN box and an upper computer which are electrically connected together in sequence, the filter circuitreceives signals, and the lock-in amplifier comprises a modulation module. The device disclosed by the invention is used for a direct current signal or a slow change signal with smaller amplitude; inorder to prevent adverse effects of 1/f noise and direct current drifting (such as temperature drifting of input offset voltage of an operational amplifier) of direct current amplification, a modulator or a chopper is generally used for converting the direct current drifting into an alternating current signal, then the alternating current signal is amplified and processed, and then demodulation and low-pass filtering are carried out to obtain an amplified detected signal. The weak signal detection device designed based on the lock-in amplifier shows excellent performance in the aspect of weaksignal detection.

Description

technical field [0001] The invention belongs to the field of oil field logging, in particular to a weak signal detection device with strong anti-interference performance. Background technique [0002] In oil and gas evaluation, weak signal not only means that the amplitude of the signal is small, but also mainly refers to the signal submerged by noise. For various weak signals to be measured, such as weak light, weak magnetism, micro pressure, micro vibration, micro temperature difference, etc., they are generally converted into micro current or low voltage by corresponding sensors, and then amplified by amplifiers to achieve Indicates the size being measured. However, because the measured signal is weak, the background noise of the sensor, the inherent noise of the amplifier circuit and the measuring instrument, and the external interference noise are often much larger than the amplitude of the useful signal. The process of amplifying the measured signal also amplifies the...

Claims

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Application Information

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IPC IPC(8): G05B19/042
CPCG05B19/0423G05B2219/21137
Inventor 张庆乐李智强林鹏李凡贡
Owner 中国电波传播研究所
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