Detection circuit of vehicle body spray humidity detector, and its application
A detection circuit and humidity detection technology, applied in the direction of detecting the appearance of fluid at the leakage point, using liquid/vacuum degree for liquid tightness measurement, instruments, etc., to achieve the effect of convenient adjustment, great practical value, and advanced technology
Inactive Publication Date: 2013-02-13
SHANGHAI UNIV OF ENG SCI
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Problems solved by technology
This kind of humidity detector is mainly used for the detection of environmental humidity, and it is not suitable for the detection of spray humidity of automobile body.
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[0020] like figure 1 , figure 2 As shown, a detection circuit of a vehicle body spray humidity detector, the detection circuit includes a probe, transistor Q1, transistor Q2, resistor R1, resistor R2, resistor R3, capacitor C1, capacitor C2, comparator U1B, comparator U1A and alarm. The probes include a first probe and a second probe. The triode has a base, a collector, and an emitter. The base of the transistor Q1 is connected to the first probe, the collector of the transistor Q1 is connected to the second probe, and the emitter of the transistor Q1 is grounded through the resistor R2. Capacitor C1 is connected in parallel with both ends of resistor R2. The collector of the transistor Q2 is connected to the collector of the transistor Q1, and the emitter of the transistor Q2 is grounded through the resistor R3. One end of the resistor R1 is connected to the base of the transistor Q2, and the other end is respectively connected to the collector of the transistor Q2 and ...
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The invention relates to a detection unit of a vehicle body spray humidity detector, and its application. A current flowing through the base electrode of a triode Q1 increases when the resistance between two probe heads of a probe decreases, meanwhile the increase of a current flowing through the triode Q1 and a resistor R2 makes the voltage applied to the resistor R2 increases, the voltage applied to the resistor R2 is output to the positive input terminal of a comparator U1A, an unchanged current flowing through a triode Q2 and a resistor R3 makes the voltage applied to the resistor R3 be unchanged, the voltage applied to the resistor R3 is output to the negative input terminal of the comparator U1A through a follower composed of a comparator U1B, and the voltage applied to the positive input terminal of the comparator U1A and the voltage applied to the negative input terminal of the comparator U1A are unbalanced, so the output terminal of the comparator U1A has an output signal, thereby an alarm is driven to alarm. Compared with circuits in the prior art, the detection circuit provided by the invention has the advantages of simple circuit structure, strong anti-interference capability, realization of adjustment and calibration according to the specific environment, and the like.
Description
technical field [0001] The invention relates to a vehicle body spray humidity detector, in particular to a detection circuit of the vehicle body spray humidity detector and its application. Background technique [0002] According to the Ministry of Communications industry standard JT / T198-95 "Automotive Technology Grade Evaluation Standard", the detection of rainproof sealing is one of the 15 key items. Automobile assembly manufacturers will conduct body spray tests on automobiles after the assembly of the entire automobile to check the sealing of the automobile body. Automobile manufacturers in Europe check whether the body is leaking after the car has been sprayed, and use corresponding instruments to detect the inside of the car body to judge the leakage of the car. In our country, the basis for judging whether there is leakage is often to rely on manual observation with the naked eye. Only a small number of automobile manufacturing companies use foreign complete sets o...
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IPC IPC(8): G01N27/06G01N27/60G01M3/16
Inventor 杨洋王才峄庄德渊
Owner SHANGHAI UNIV OF ENG SCI