Title:
LIQUID-SURFACE DETECTION DEVICE AND DETECTION METHOD, AND FULLY AUTOMATED SAMPLING DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/166215
Kind Code:
A1
Abstract:
Provided is a liquid-surface detection device, comprising: a probe (210), used for taking in a test liquid and outputting its own capacitance; a detection circuit (220), used for providing a voltage or current to excite the probe (210) and an LC resonant circuit (221) to resonate and produce a resonance signal; a shaping circuit (223) connected to the LC resonant circuit (221) and used for converting the resonance signal to a digital signal and outputting the digital signal; a frequency-measurement circuit (224) connected to the shaping circuit (223) and used for measuring the digital signal and outputting the resonance frequency of the resonance signal or the change of the resonance frequency; a processing circuit (230) connected to the output of the detection circuit (220) and used for outputting, according to the resonance frequency or change of the resonance frequency outputted by the frequency-measurement circuit (224), an indication signal characterizing whether the probe (210) has come into contact with the test liquid. The liquid-surface detection method and fully automated sampling device have a simplified circuit structure, improving the interference resistance of the circuit.
Inventors:
CHEN YUEPING (CN)
HUANG YONG (CN)
ZHU XINGCAI (CN)
HUANG YONG (CN)
ZHU XINGCAI (CN)
Application Number:
PCT/CN2016/078160
Publication Date:
October 05, 2017
Filing Date:
March 31, 2016
Export Citation:
Assignee:
SHENZHEN MINDRAY BIO-MEDICAL ELECTRONICS CO LTD (CN)
International Classes:
G01F23/26; G01Q60/24; G01Q60/38
Domestic Patent References:
| WO2007088395A1 | 2007-08-09 |
Foreign References:
| CN102159930A | 2011-08-17 | |||
| CN2525487Y | 2002-12-11 | |||
| CN1482609A | 2004-03-17 | |||
| CN1928488A | 2007-03-14 | |||
| US20050223812A1 | 2005-10-13 |
Attorney, Agent or Firm:
GUANGZHOU SCIHEAD PATENT AGENT CO., LTD. (CN)
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