CN201392335Y - Dangerous liquid detector - Google Patents

Abstract

The utility model discloses a dangerous liquid detector, which comprises a group of metal flaky inductance electrodes, a common grounding electrode, an active electrode, a group of measuring electronic signal processing circuits and a microprocessor, wherein the common grounding electrode forms a plurality of capacitors corresponding to the inductance electrodes. The active electrode is connected with an alternating current voltage source. The utility model aims to provide the dangerous liquid detector to resolve the technical problem of danger of non-contact type liquid detection. The dangerous liquid detector further resolves technical problems that a traditional liquid detector is slow in response speed, long in detection time, low in accuracy and the like.

Description

The dangerous liquid detector

Technical field

The utility model relates to a kind of dangerous liquid pick-up unit.

Background technology

Existing hand-held dangerous liquid detector is to adopt static electronics x-ray tomography camera technique, estimates the space ordering that to treat conductive materials in the liquid bulk, thereby distinguishes dangerous liquid and non-dangerous liquid.Problems such as described hand-held dangerous liquid detector exists the False Rate height, and reaction velocity is relatively slow.

Summary of the invention

The purpose of this utility model provides a kind of dangerous liquid detecting instrument, solve adopting the technical matters of the liquid hazardous property of non-contact detection, and has solved that traditional detection instrument reaction velocity is slow, detection time is long and technical matters such as accuracy rate is low.

The utility model realizes that the technical scheme that the foregoing invention purpose is adopted comprises:

Be positioned at the fill insulant outside, and fix one group of Metal Flake induction electrode of its side, described one group of induction electrode is spaced along same dextrad;

Be positioned at the fill insulant inboard, and fix a common ground electrode of its side, this common ground electrode and a plurality of capacitance structures of the corresponding formation of described induction electrode;

Be positioned at the fill insulant outside, and fix a positive electrode of its side, this positive electrode spread is in the end of one group of induction electrode, and is connected with alternating-current voltage source;

Measure the electronic signal process circuit for one group, this signal processing circuit comprises nuclear integrating circuit and the signal amplification circuit of being made up of jointly induction electrode, each signal processing circuit respectively with corresponding induction electrode connection;

Analyze the microprocessor of parameter that each induction electrode gathers and the relation of normal fluid parameter, each data of this microprocessor are gone into end and are connected successively with the signal amplification circuit output terminal of one group of measurement E-signal processor.

The utility model is compared with traditional hand-held dangerous liquid detector, has following advantage and good effect:

1, the character of non-contact detection liquid, the danger of judgement liquid;

2, be quick on the draw, detection time is short, the accuracy rate height;

3, outward appearance is small and exquisite, is easy to carry about with one, and method of operating is simple, and is practical.As long as the induction electrode of sensor contacted fully with the chamber wall that liquid is housed or adjoining, press test button, about about 3 seconds, with regard to testing result as can be known.

Description of drawings

Fig. 1 is a detection principle schematic of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

Embodiment of the present utility model is referring to accompanying drawing.Fig. 1 is the principle schematic that detects dangerous liquid, the 1st, and tested liquid; The 2nd, the contain fluid container and may exist the clearance; The 3rd, positive electrode is connected to alternating-current voltage source (V); The 4th, induction electrode is connected to measures electronics (D1-D4): induction electrode is the sheet metal of 7mm (length) X16mm (wide), is arranged on the inside of casing, contacts with the container of tested liquid by the casing sensor external; Measuring electronics (D1-D4) is the nuclear integrating circuit; The 5th, the common ground electrode: the effect of this electrode is a ground connection, constitutes a little electric capacity respectively with D1-D4; The 6th, the electric field line of free space connects transmitter and receiver and determines corresponding sensitizing range; The 7th, unit of account and index: calculate by a microprocessor in the instrument.

Tested liquid 1 is contained in the liquid container 2 in Fig. 1, and actively telegram 3 and four induction electrodes 4 vertically are spaced outside being positioned at the fill insulant (not shown) successively.These electrodes 3,4 adopt thin smooth copper sheet.Fill insulant inboard at corresponding these electrodes 3,4 is a common ground electrode 5, and this common ground electrode 5 forms four little electric capacity respectively with induction electrode 4.Described positive electrode 3 is connected with alternating-current voltage source.

The output terminal of the little electric capacity that induction electrode 4 constitutes has faint voltage signal, by nuclear integrating circuit and signal amplification circuit, above-mentioned signal is amplified (D1-D4 among the figure), by the AD part of microprocessor 7, obtain the voltage swing of U1-U4 again, afterwards by analyzing the relation of U1-U4, if the variance of U1-U4 is less than D (wherein D is obtained by the experimental data of reality to water), then think water, if the variance of U1-U4 greater than D, is then thought alcohol.

We know that several liquid are arranged: water, alcohol and kerosene etc.Wherein, water is the good conductor of knowing, and alcohol and kerosene are not electrolyte, and its resistance of poor conductor is very big.

The design of circuit is the key of this product, under alternating voltage,

U＝ZI，(1)

Wherein, U is a voltage, and I is an electric current, and Z is imitated resistance by the time.Under the situation of resistance and electric capacity polyphone,

$Z=\sqrt{{\left(\frac{1}{\mathrm{\ωC}}\right)}^2+R^2}$

Wherein be the frequency of ω time variant voltage, C is an electric capacity, and R is the resistance of liquid.

If water, R1=R2=R3=R4=0, so the voltage at the electric capacity two ends is identical, if we suppose C1=C2=C3=C4, then the electric current of process is identical, so will measure 1: 1: 1: 1 electric weight ratio.

If alcohol or kerosene, we suppose that R is enough big, make in (2) formula,

Item can be ignored, and the size of resistance and their length are direct ratios, so R1: R2: R3: R4=1: 2: 3: 4, identical down at voltage, the electric weight that passes through just in time was inverse ratio Q1: Q2: Q3: Q4=4: 3: 2: 1

The utility model uses common No. 5 batteries of 2 joints, weight: 160 grams (not comprising battery), size: 132 * 67 * 22 (mm), Measuring Time: within 3 seconds.

In Fig. 2, sensor is that common ground electrode 5 forms four little electric capacity respectively with induction electrode 4, the nuclear integrating circuit is to measure electronics (D1-D4), amplifying circuit is for carrying out the circuit of processing and amplifying to faint voltage signal, central processing unit is the parameter of each induction electrode collection of analysis and the circuit of normal fluid parameters relationship, alarm is the analysis according to central processing unit, when dangerous liquid exists, sends the cue circuit of warning.

Claims (1)

1, a kind of dangerous liquid detector is characterized in that it comprises:

Be positioned at the fill insulant outside, and fix one group of Metal Flake induction electrode of its side, described one group of induction electrode is spaced along same dextrad;

Be positioned at the fill insulant inboard, and fix a common ground electrode of its side, this common ground electrode and a plurality of capacitance structures of the corresponding formation of described induction electrode;

Be positioned at the fill insulant outside, and fix a positive electrode of its side, this positive electrode spread is in the end of one group of induction electrode, and is connected with alternating-current voltage source;

Measure the electronic signal process circuit for one group, this signal processing circuit comprises nuclear integrating circuit and the signal amplification circuit of being made up of jointly induction electrode, each signal processing circuit respectively with corresponding induction electrode connection;

Analyze the microprocessor of parameter that each induction electrode gathers and the relation of normal fluid parameter, each data of this microprocessor are gone into end and are connected successively with the signal amplification circuit output terminal of one group of measurement E-signal processor.

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