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Active scanning orthogonal vector digital phase-locked amplifier

A quadrature vector, active scanning technology, applied in parametric amplifiers, amplifiers, amplifier types, etc., can solve the problems of phase amplifier frequency jitter, phase drift, drift, etc., to eliminate frequency nonlinearity, eliminate phase drift, and high performance indicators. Effect

Inactive Publication Date: 2015-07-29
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0011] The purpose of the present invention is to overcome the defects of existing lock-in amplifiers, solve the problem of miniaturized lock-in amplifiers that need to be used in wavelength modulation absorption spectroscopy technology, and meet the fast response requirements of online measuring instruments, and solve the problem of existing commercial lock-in amplifiers. The jitter or drift of the amplifier frequency causes the problem of phase drift

Method used

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  • Active scanning orthogonal vector digital phase-locked amplifier
  • Active scanning orthogonal vector digital phase-locked amplifier
  • Active scanning orthogonal vector digital phase-locked amplifier

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Embodiment Construction

[0042] Such as figure 1and figure 2 Shown, a kind of active scanning type orthogonal vector digital lock-in amplifier comprises the signal conditioning module connected successively, signal acquisition module, data processing and modulating signal and scanning signal module, communication module, liquid crystal display module, it is characterized in that: all The signal modulation module described above includes a current-voltage conversion circuit, a wave trap, a low-pass filter, and a single-ended to differential circuit connected in sequence. The input end of the current-voltage conversion circuit is connected with a detector to detect the signal to be tested, and the signal The acquisition module is a high-speed high-bit AD acquisition card, and the data processing and modulation signal and scanning signal modules are modules based on FPGA chips, with built-in buffer FIFO, on-chip ROM / RAM storage area, orthogonal vector algorithm module, and sampling controller And data ...

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Abstract

The invention discloses an active scanning orthogonal vector digital phase-locked amplifier. The active scanning orthogonal vector digital phase-locked amplifier comprises a signal conditioning module, a signal acquisition module, a data processing and modulating signal / scanning signal module, a communication module and a liquid crystal display module. The signal conditioning module is used for performing preprocessing such as pre-amplifying, notching and anti-aliasing filtering, and the preprocessed signal is cached in a caching and input signal processing module FPGA chip after A / D high-speed data acquisition, and then stored in an external memory. Two synchronous frequency-doubling reference signals are generated inside the FPGA and then put into an orthogonal vector digital demodulation (DILA) processing unit with a signal to be tested, and a harmonic signal is output after DILA operation. The harmonic signal data are communicated with an upper computer by virtue of network transmission or a serial manner, or output by virtue of a USB. The modulating and scanning signal module inside the FPGA chip generates modulating and scanning signals.

Description

Technical field: [0001] The invention relates to a lock-in amplifier, in particular to an active scanning orthogonal vector digital lock-in amplifier for extracting primary and second harmonic signals in TDLAS wavelength modulation. technical background: [0002] The combination of wavelength modulation technology and TDLAS technology uses a digital lock-in amplifier to extract the first and second harmonic mass flow measurement method, which has non-contact measurement, high spatial resolution, fast dynamic response, high measurement accuracy, large measurement range, and no need to add Tracer particles, easy miniaturization and other characteristics are currently the best technical means for the measurement of Chaoran ramjet. The detection of the oxygen mass flow rate of the intake port, the improved control of the variable geometry of the engine, the mixed compression intake port, and the design of the intake port mass flow sensor that can meet the flight needs provide th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F7/00H03L7/00
Inventor 刘文清贾良权阚瑞峰刘建国姚路阮俊许振宇魏敏张光乐
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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