Apparatus for detecting weak signal based on time-frequency transformation

A technology of weak signal detection and time-frequency conversion, applied in the direction of using electric/magnetic devices to transfer sensing components, spectrum analysis/Fourier analysis, etc., can solve problems such as system hardware complexity, and achieve high measurement sensitivity and hardware circuit structure Simple, the effect of improving the signal-to-noise ratio

Inactive Publication Date: 2008-08-27
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] Although the device for detecting weak signals using digital phase-locking detection method and analog phase-locking detection method can realize the detection of weak signals, the system hardware is relatively complicated. No matter the analog phase-locking method or the digital phase-locking method, not only the processing of the signal channel is required , it is also necessary to generate a specific reference signal through some methods

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  • Apparatus for detecting weak signal based on time-frequency transformation
  • Apparatus for detecting weak signal based on time-frequency transformation
  • Apparatus for detecting weak signal based on time-frequency transformation

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Embodiment Construction

[0035] The present invention as figure 1 As shown, it includes a signal channel unit 1 , an analog-to-digital conversion unit 2 and a processor 3 . The signal channel unit 1 includes an amplifying circuit 11 , a gain control circuit 12 and an anti-aliasing filter 13 ; wherein the amplifying circuit 11 includes a preamplifier 111 and a secondary amplifier 112 . The pre-amplifier 111 is a weak-signal pre-stage operational amplifier, using a high-precision, low-noise instrumentation amplifier INA118; the secondary amplifier 112 is an OP07 amplifier. The gain control circuit 12 adopts a programmable gain controller, and its model is AD8321. Anti-aliasing filter 13 uses an operational amplifier (OP07) to implement active low-pass filtering. The analog-to-digital conversion unit 2 adopts a bipolar AD converter, the model of which is AD676. The analog-to-digital conversion unit 2 can also use a unipolar Σ-Δ type analog-to-digital converter, the model of which is ADS1255. When the...

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Abstract

The invention relates to a weak signal detection device based on time frequency conversion, which comprises a signal channel unit, an analog-digital conversion unit and a processor. A modulated signal to be tested is inputted into the signal channel unit for amplification and filtering by the signal channel unit; the analog-digital conversion unit outputs a quantized signal after sampling the analog signal outputted by the signal channel unit; the processor receives the quantized signal outputted by the analog-digital conversion unit and converts the quantized signal into a frequency domain signal for power spectral analysis, thereby obtaining the measuring results. The small signal detection device adopts the processor which converts the time domain signal into the frequency domain signal to detect the weak signal in the frequency domain and obtain the measuring results without a device producing a specific reference signal, thereby bringing about simple hardware structure and low cost.

Description

Technical field: [0001] The invention relates to a weak signal detection device, in particular to a weak signal detection device based on time-frequency transformation. Background technique: [0002] Weak signal detection is a cutting-edge field in measurement technology. Generally, sensors are used for power conversion to convert the detection object into power. When the useful signal is covered by a large amount of noise, the measurement is greatly limited. The main means of weak signal detection is to improve the signal-to-noise ratio of the signal. At present, the method of weak signal detection technology is through the lock-in amplification method, and the lock-in amplification method is divided into a digital lock-in detection method and an analog phase-lock detection method. The device for detecting weak signals by using the analog phase-locking detection method is mainly composed of a signal channel unit, a reference unit, a phase-sensitive detection unit, an anal...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/12G01R23/16
Inventor 叶新杨东军弓成虎王玉鹏方伟
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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