CN201434836Y - Optical and digital integrated dual-mode intelligent methane detector - Google Patents

Abstract

The utility model belongs to the technical field of the hazardous gas detection device, and in particular relates to an optical and digital integrated dual-mode intelligent methane detector, which solves the problems of cumbersome measurement methods, serious human errors, no data storage capacity and the like in the prior art. In the technical scheme, the optical and digital integrated dual-modeintelligent methane detector comprises a light source, a condensing lens, a reflection plane, parallel glass, an air chamber, a refraction prism, a reflection prism and a spectrum display component, wherein the light source adopts a light-emitting diode with high brightness, the parallel position of the reflection prism is provided with a beam splitting prism, and an optical and digital conversionand display system is arranged below the beam splitting prism. The utility model has the advantages of high degree of integration, high degree of intelligentization and easy carrying. Moreover, the utility model not only can be used for visual measurement, but also can be directly used for digital display, data storage and automatic alarming.

Description

Light is counted the double mode intelligent methane detector of one

Technical field

The utility model belongs to harmful gas checkout equipment technical field, is specifically related to the double mode intelligent methane detector device of a kind of optics and digital one.

Background technology

Methane is harmful gas main under the coal mine, is directly threatening mine safety production and miner's life security.It mainly is to detect the aerial volumetric concentration of methane that methane detects, and to grasp down-hole methane concentration situation, prevents the generation of methane accident.

At present, the instrument of China's detection methane mainly contains: (1) thermocatalysis type methane detection alarming instrument.When certain working current during by black element (making) with scribbling the thermocatalyst platinum filament, its surface promptly is heated to uniform temperature, when filling in the reaction chamber when containing the air of methane, methane touches black element surface, promptly is smokeless combustion in reaction chamber, emits heating power, the temperature of black element (platinum filament) is raise, cause the resistance value of platinum filament obviously to increase, so electric bridge with regard to out of trim, is exported certain voltage.Be lower than at methane concentration under 4% the situation, voltage and the methane concentration of electric bridge output are in linear relation basically, so can calculate the numerical value of methane concentration according to the size of measuring bridge output voltage.Its domestic representative products is the hot effect formula of the AQP-1 type methane analyzer that Fushun coal fail safe instrument factory produces.(2) thermal conductance type methane detector.The ultimate principle of thermal conductance type methane detector and structure are similar to the thermocatalysis type substantially, and its main difference is: the response element of thermal conductance type methane detector is thermal sensing element such as thermistor, platinum filament, tungsten filament etc.When filling in the reaction chamber when containing the air of methane, because methane is bigger 1.296 times than the thermal conductivity of air, thereby can reduce the temperature of thermal sensing element, and cause its resistance to change, thereby destroy the balance of electric bridge.The heat-conducted methane analyzer of KDD-1 type that representative products has Fenghua, Zhejiang electronics Watch Factory to produce, the heat-conducted methane analyzer of LRD-1 type that red flag instrucment and meter plant in Changzhou produces.(3) gas sensory formula methane detector.Gas sensory is being heated under the situation of steady state (SS), and when gas absorption, absorbing molecules at first freely spreads on the surface.A part of therebetween molecule evaporation, a part of molecule just is fixed on absorption place.If the work function of material is less than the electron affinity of absorbing molecules at this moment, then absorbing molecules will be captured electronics and become negative ion absorption from material; If the material work function is greater than the dissociation energy of absorbing molecules, absorbing molecules will discharge electronics and become positive ion absorption to material.NOx (nitrogen type oxide) tends to negative ion absorption, is called oxidized form gas.HZ, CO, hydrocarbon and drinks tend to positive ion absorption, are called reduced form gas.The oxidized form gas absorption will make charge carrier reduce to N-type semiconductor, thereby the resistivity of material is increased.The reduced form gas absorption will make charge carrier increase to N-type semiconductor, and resistivity of material descends.According to this characteristic, just can learn the kind and the concentration of adsorbed gas from the situation of change in resistance.Home products has TONS-GOAA gas alarm instrument, GM3 gas detecting instrument etc.(4) methane detector of infrared absorption principle.The infrared absorption type methane detector is to utilize gas with various that infrared radiation is had different absorption spectrums, and the absorption intensity rule relevant with gas concentration detects methane concentration.Infrared absorption type gas analysis detector is measured the gas specimen chamber generally by infrared origin (incandescent lamp or infrared LED), wavelength selection system (optical filter), and infrared detection device (as pyroelectric detector, thermobattery) is formed.If gas absorption spectrum line is in the incident light spectrum scope, after infrared radiation sees through tested gas so, the decay of energy will take place at corresponding spectral line place, and unabsorbed radiation is measured by probe, learns tested gas concentration by the damping capacity of measuring this spectral line place energy.The advantage of infrared gas detector is that measurement range is wide, selectivity good, explosion-proof is good, especially when tested gas concentration is too high, can intoxicating phenomenon not take place the image carrier catalysis element like that.(5) optics methane detector.The light interference type methane detector is a kind of portable instrument of measuring methane concentration that generally use the China's coal-mine down-hole.Because light is relevant with the density of gas by the refractive index of gas medium, if the striped that produces when all charging into fresh air with density with air plenum and methanic chamber is benchmark (to zero), when methanic chamber charges into the air that contains methane (mensuration of bleeding), because the density of the methane-containing gas in the fresh air in the air plenum and the methanic chamber is different, cause change of refractive, light path also just changes thereupon, so interference fringe produces displacement (moving), can see the distance of moving interference fringes from eyepiece.Because the displacement and the methane concentration relation in direct ratio of interference fringe, so just can record the concentration of methane according to the displacement of interference fringe, can observe residing methane concentration scale value after the moving interference fringes from eyepiece, so just can record methane concentration.Domestic early production is based on the AQG-1 type.

Above-mentioned thermocatalysis type methane detector be except that interference of light methane detector at the more general portable methane detector of mine down-hole application, but thermocatalysis type methane detector exist the adjustment cycle short, easily poison, defective that serviceable life is short etc. can't overcome.Interference of light methane detector becomes China's coal-mine and uses the most general portable methane detector device because its stable performance, long service life, measurement are accurate.Yet, existing range estimation type interference of light methane detector mainly adopts the method for artificial reading, exist that automaticity is low, measuring method is loaded down with trivial details, reading is directly perceived, personal error is big, can not store data etc. self weakness, that is: when (1) uses range estimation type interference of light methane detector to detect, by reading certain close integer scale after the black baseline shift in the eyepiece, rotate tangent screw again, make black baseline fall back on this integer scale, read decimal place from little reading dial.Theoretical precision reaches 0.01%, but because committed step " makes black baseline fall back on this integer scale " for range estimation, so the actual measurement precision is well below 0.01%.(2) measuring method is loaded down with trivial details.Range estimation type interference of light methane detector is according to the methane refractive index, and the scale value of under 20 ℃ of temperature and standard atmosphere condition, demarcating, when temperature, air pressure change are big, do corresponding correction.In addition, before the inspection, must in the air intake lane close, pinch and put air-breathing ball cleaning methanic chamber with place to be measured temperature.The school zero then, prevents to occur the zero point drift phenomenon when measuring because excessive temperature differentials causes.(3) manual read fetches data, and is inconvenient to form down-hole record and storage data automatically.

Summary of the invention

The purpose of this utility model is the deficiency that exists at present technology, on tradition range estimation formula interference of light methane detector basis, by integrated high precision Amici prism, integrate optical measurement and digital measurement two parts, make the instrument dual-use, light-electricity complementary, provide a kind of light count one double mode, highly integrated, be easy to carry, can estimate, again can direct digital display, the storage data, report to the police automatically be suitable for the on-the-spot portable methane concentration detector that uses under the coal mine.

The utility model is to realize above-mentioned purpose by the following technical solutions: this light is counted the double mode intelligent methane detector of one, comprises light source, condenser, the plane of reflection, parallel glass, air chamber, refractive prism, reflecting prism and spectrum display unit.Described light source adopts highlighted light emitting diode; Be provided with an Amici prism at the parallel place of reflecting prism, below Amici prism, be provided with light number conversion and display system.

Described smooth number conversion and display system comprise photoelectric sensor, and the VT of photoelectric sensor links to each other with the amplification filtering circuit, and the amplification filtering circuit links to each other with single-chip microcomputer by binarization circuit; Single-chip microcomputer links to each other with photoelectric sensor by the photoelectric sensor driving circuit; Single-chip microcomputer also respectively with LCDs, warning circuit, and data-carrier store link to each other; Single-chip microcomputer is provided with temperature sensor and communication interface.

The utility model has adopted White LED in the light path of former interference of light methane detector be highlighted light emitting diode, and increasing high precision Amici prism and CCD is high sensitivity photosensors; Part interference light directly arrives eyepiece behind Amici prism, another part interference light is after the Amici prism beam split, under the driving of single-chip microcomputer, impinge upon on the high-sensitive CCD photoelectric sensor and change into video signal, calculating by amplification filtering and binaryzation and single-chip microcomputer then, the methane concentration of correspondence is presented on the LCDs, at this moment, methane concentration by spectrum observation is consistent with the methane concentration on the LCDs, single-chip microcomputer is remembered minute and methane concentration value simultaneously, if methane concentration transfinites, single-chip microcomputer will drive warning circuit.The utility model has realized that light counts the double mode intelligent methane of one and detect, and can detect the methane concentration in operation place at any time, and numeral and spectrum show the methane concentration value simultaneously, save historical data to download for inquiry and host computer highly intellectuality.

Description of drawings

Fig. 1 is a structure principle chart of the present utility model.

Embodiment

Below in conjunction with drawings and Examples the utility model is described in further detail.

Referring to Fig. 1, range estimation formula interference of light methane of the present utility model test section comprises light source 1, condenser 2, the plane of reflection 3, parallel glass 4, air chamber 5, refractive prism 6, reflecting prism 7 and spectrum display unit, wherein, light source 1 employing White LED is highlighted light emitting diode.As can be seen from FIG., also be provided with a semi-transparent semi-reflecting Amici prism 8, below Amici prism 8, be provided with light number conversion and display system 9 at the parallel place of reflecting prism 7.

The course of work of the present utility model is as follows: light source 1 is luminous, by entering the plane of reflection 3 behind condenser 2 optically focused, light reflects laggard air inlet chamber 5, arrive refractive prism 6 reflections then and arrive the plane of reflection 3 through air chamber 5, reflex to reflecting prism 7 then, increase Amici prism 8 and carry out beam split after the light path after reflecting prism 7 reflections, a part of light directly enters the eyepiece display light interference fringe of interference of light methane detector; Another part light enters light number conversion and display system 9 through Amici prism 8, from the theory diagram of light number conversion and display system 9, can see, light source becomes vision signal after by the number conversion of CCD light under single-chip microcomputer and CCD drive, then after amplification filtering and binaryzation, enter single-chip microcomputer, by the Single-chip Controlling liquid crystal display, sound and light alarm and data storage started when methane transfinited.Single-chip microcomputer is provided with temperature sensor and communication interface, is used for measurement update and is connected with host computer.

Principle of work of the present utility model is: the light that is sent by light source 1 is behind condenser 2, arrive level crossing 3, through its former and later two surface reflections, part light beam passes the air plenum of air chamber 5 downsides, by refractive prism 6 it is turned back, get back to level crossing 3, (plating reflectance coating) reflection after passing the air plenum of upside in its rear surface, near " 0 " point, pass level crossing and advance, behind deviation, enter telescopic system to reflecting prism 7.Another part refraction of optical beam enters level crossing, in surface reflection thereafter, pass the middle methanic chamber of air chamber then, get back to methanic chamber again through the refractive prism reflection, propagate into level crossing 3, near " 0 " point, together enter telescopic system through flat mirror reflects and above-mentioned segment beam.This two-beam can produce interference fringe on the focal plane of object lens.Human eye can be observed this interference fringe by eyepiece, when methanic chamber all was full of identical gas with air plenum, did not move the position of interference fringe, but after methane gas is rushed in methanic chamber, because the result of optical path difference, interference fringe can move a segment distance with respect to original position.Measure this displacement, just the aerial content of methane as can be known.

This gas detecting instrument is according to the gas of variety classes and variable concentrations different design of refractive index to light.As long as predict the refractive index of certain gas, just can learn the concentration of tested gas sample according to the distance of moving interference fringes.If the length of air chamber is long, then light beam is also long through the distance of gas, and the deviation sensitivity of interference of light striped is just high, otherwise then low.So, can utilize the different length that changes air chamber to measure the gas sample of variable concentrations.

When the utility model adopts semi-transparent semi-reflecting Amici prism to make interference pattern enter the range estimation system, another road is radiated at optoelectronic sensor CCD surface, CCD detects by the moving interference fringes amount, enter single-chip microcomputer after amplification and filtering, single-chip microcomputer is finished functions such as demonstration, storage, sound and light alarm after the moving interference fringes amount is changed, analyzes, calculates, handled.

Claims (2)

1, a kind of light is counted the double mode intelligent methane detector of one, comprises light source, condenser, the plane of reflection, parallel glass, air chamber, refractive prism, reflecting prism and spectrum display unit; It is characterized in that: described light source adopts highlighted light emitting diode; Be provided with an Amici prism at the parallel place of reflecting prism, below Amici prism, be provided with light number conversion and display system.

2, light according to claim 1 is counted the double mode intelligent methane detector of one, it is characterized in that: described smooth number conversion and display system comprise photoelectric sensor, the VT of photoelectric sensor links to each other with the amplification filtering circuit, and the amplification filtering circuit links to each other with single-chip microcomputer by binarization circuit; Single-chip microcomputer links to each other with photoelectric sensor by the photoelectric sensor driving circuit; Single-chip microcomputer also respectively with LCDs, warning circuit, and data-carrier store link to each other; Single-chip microcomputer is provided with temperature sensor and communication interface.