Liquid level detection device and liquid level detection method

Abstract

The invention discloses a liquid level detection device and a liquid level detection method. The liquid level detection device comprises a signal generation circuit, a signal processing circuit and asignal processing circuit, wherein the reference circuit and the sampling circuit respectively receive signals with preset frequency and preset waveform and output corresponding first signals and second signals, and the sampling circuit is connected with the liquid level detection needle; the comparison circuit is connected with the reference circuit and the sampling circuit so as to receive the first signal and the second signal and generate a corresponding comparison result signal; the processing circuit is connected with the comparison circuit to receive the comparison result signal, and when the processing circuit determines that the difference value between the output voltage corresponding to the comparison result signal and the threshold voltage is larger than or equal to the set voltage, a liquid level confirmation signal is generated to determine that the liquid level detection needle makes contact with the liquid level, wherein the threshold voltage is determined according toa comparison result signal received by the processing circuit when the liquid level detection needle is not in contact with the liquid level. In this way, the liquid level detection precision can be improved, and the response time can be shortened.

Description

technical field [0001] The present application relates to the technical field of medical testing instruments, in particular to a liquid level detection device and a liquid level detection method. Background technique [0002] At present, automatic medical testing instruments (such as automatic biochemical analyzers, automatic blood coagulation analyzers, automatic specific protein analyzers, automatic immune analyzers, etc.) are attracting more and more attention due to their advantages of high efficiency and speed. [0003] Among them, liquid level detection is an indispensable function in automatic medical testing instruments. Its main function is to control the depth of the sampling needle inserted into the sample / reagent, so as to minimize the crossover caused by the sample / reagent attached to the outer surface of the sampling needle. pollute. [0004] The inventors of the present application have discovered in the course of long-term research that current liquid level ...

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Problems solved by technology

[0004] The inventors of the present application have discovered in the course of long-term research that the devices currently on the market for liquid level detection (for example, capacitive detection switch chips, etc.) have the disadvantages of low detection accuracy and long response time

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