Detecting probe liquid level detector and method

A liquid level detection and probe technology, which is applied in measuring devices, liquid level indicators, liquid/fluid solid measurement, etc., can solve the problems of large amount of reagents and samples, poor anti-interference ability, stepping motor control error, etc. , to achieve the effects of improving sensitivity and anti-interference, improving anti-interference, and avoiding sudden changes in slope

Active Publication Date: 2008-03-05
SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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Problems solved by technology

[0006] However, this liquid level detection scheme is purely implemented by analog circuits. As long as the voltage value of the current voltage signal is greater than the set threshold, the contact liquid level indication signal will be output immediately. This scheme has poor anti-interference ability and is prone to interference and false detection. As a result, errors occur in the control of the stepping motor. In order to increase the reliability of the detection, that is, the anti-interference ability, it can only be realized by increasing the comparison threshold of th

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  • Detecting probe liquid level detector and method
  • Detecting probe liquid level detector and method
  • Detecting probe liquid level detector and method

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[0041] The liquid level detection device of the present invention comprises: a liquid suction probe, a detection circuit and a needle tube motion control mechanism. The liquid-absorbing probe can be a double-layer liquid-absorbing probe or a single-tube needle, and the detection circuit includes a phase-locked loop integrated circuit, a band-pass filter circuit, an amplifier circuit, an A / D conversion, a CPU, etc.; The liquid probe is equivalent to a capacitor, including a conductive outer needle tube, a conductive inner needle tube and an intermediate insulating layer. The wire drawn from the conductive outer needle tube is grounded and connected to the ground of the detection circuit, and the wire drawn from the conductive inner needle tube is connected to the phase-locked loop integrated circuit. The voltage-controlled oscillator should be connected to the pin of the oscillating capacitor, and together with the oscillating capacitor of the VCO (voltage-controlled oscillator)...

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Abstract

The method comprises: receiving the capacitance value signal outputted from the imbibe probe; according to the variation of the capacitance, outputting the voltage signals corresponding to the capacitance; deciding if the voltage value of current voltage signal is less than a threshold value; if yes, then calculating the gradient of neighboring voltage signals; deciding if the gradient is more than a gradient threshold; if yes, adding 1 in the first fluid level blip counter; if not, subtracting 1 in the first fluid level blip counter; deciding if the first fluid level blip counter value is more than or equals a first preset value; if yes, then outputting the fluid surface touching indication signal.

Description

【Technical field】 [0001] The invention relates to a liquid level sensing device, in particular to a device and a method for detecting the liquid level of a sample in the sampling process of an automatic biochemical analyzer. 【Background technique】 [0002] The biochemical analyzer needs to take samples first when analyzing body fluids. The liquid suction probe is driven by the motor to go down in the test tube. When it touches the liquid surface, the motor must stop in order to prevent the needle tube from touching the bottom of the test tube and absorbing unnecessary body fluids. After absorbing the body fluid, the needle tube goes up and returns under the drive of the motor. Therefore, liquid level detection must be carried out during biochemical analysis. When the needle tube touches the liquid level, it is necessary to output a contact liquid level indication signal to the motor control unit, so as to control the motor to stop. Existing liquid level detection technologi...

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Application Information

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IPC IPC(8): G01F23/26G01N35/10
CPCG01N2035/1025G01F23/268G01F23/266G01F23/263
Inventor 李伟刘奇林朱星才
Owner SHENZHEN MINDRAY BIO MEDICAL ELECTRONICS CO LTD
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