Analog multi-channel acquisition and amplification device and system with adjustable magnification

Abstract

The invention provides an analog multi-channel acquisition and amplification device and system with adjustable magnification. The device comprises a coarse-tuning amplifier, whose input is connected to an external detector; a fine-tuning amplifier, whose input is connected to an output of the coarse-tuning amplifier; a shaper, whose input is connected to an output of the fine-tuning amplifier, for The signal output by the fine-tuning amplifier is shaped into a positive trapezoidal wave signal; the input terminal of the analog-to-digital converter is connected to the output terminal of the shaper; the controller is connected to the first magnification control unit and the control terminal of the first magnification control unit , the controller transmits the data collected by the analog-to-digital converter to an external computer, and adjusts the magnifications of the first magnification control unit and the second magnification control unit according to the signal strength change instructions sent by the computer, so that the standard calibration samples correspond to The actual peak position of the peak coincides with the standard reference position. The invention can calibrate the spectral peak position in a wide range and ensure the test accuracy of samples.

Description

technical field [0001] The invention relates to the field of signal acquisition, in particular to an analog multi-channel acquisition and amplification device and system with adjustable magnification. Background technique [0002] In the prior art, the adjustment of the signal amplification relies on the adjustment of the analog potentiometer, so that with the change of the ambient temperature, the large-scale spectral peak shift caused by the aging of the components is inconvenient to adjust again, especially after the instrument has been assembled and shipped. In addition, the calibration of the small-amplitude spectral peak shift relies on pure software to shift the entire spectral shape left and right, which cannot truly reflect the change of signal intensity, which affects the test accuracy of the sample. Finally, the working voltage is too high, resulting in excessive heat generation of components, which cannot be integrated on a large scale, increasing the density of ...

AI Technical Summary

Problems solved by technology

[0002] In the existing technology, the adjustment of the signal amplification factor depends on the adjustment of the analog potentiometer, so as the ambient temperature changes, the large-scale spectral peak drift caused by the aging of components is inconvenient to adjust again, especially after the instrument has been assembled and shipped

In addition, the calibration of the small-amplitude spectral peak drift relies on pure software to translate the entire spectral shape left and right, which cannot truly reflect changes in signal strength and affect the accuracy of sample testing.

Finally, the working voltage is too high, resulting in excessive heat generation of components, which cannot be integrated on a large scale, increasing the density of board-level parts and reducing the size of the board-level

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