CN101750273A - Three-dimensional oil contamination degree detector - Google Patents
Three-dimensional oil contamination degree detector Download PDFInfo
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- CN101750273A CN101750273A CN200810180597A CN200810180597A CN101750273A CN 101750273 A CN101750273 A CN 101750273A CN 200810180597 A CN200810180597 A CN 200810180597A CN 200810180597 A CN200810180597 A CN 200810180597A CN 101750273 A CN101750273 A CN 101750273A
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Abstract
The invention relates to a three-dimensional oil contamination degree detector for counting particles in various oil. The detector is based on a photoelectric principle; to-be-detected oil passes through a avoid between transparent thin plates; the light of a light-emitting diode adopts parallel light beams after passing through a convex lens; the parallel light beams are radiated onto a receiving head of the receiving light-emitting diode after passing through the transparent thin plates of the through oil; and current signals can be generated at two ends of the receiving light-emitting diode are generate at the moment. Because a signal level is in proportion to the dimension of each particle, the number of the particles contained in the oil can be determined according to the number of impulses, and the dimension of each particle can be determined according to an impulse level. After the level signal is detected and classified by a processing circuit, the contamination degree of the oil can be judged. The invention has the advantages of high measurement accuracy, high stability and convenient use.
Description
Technical field
The design's invention belongs to a kind of testing circuit, relates generally to the photoelectric switching circuit and the counting output circuit of grain count in the various fluid.
Background technology
Fluid is the actuating medium of hydraulic system, and the control information of hydraulic system and the transmission of operation power all will be finished by fluid, and be all closely related with the performance of hydraulic oil as the working condition and the serviceable life of elements such as hydraulic pump, oil motor, various valves.In recent years, for monitoring fluid is to guarantee the hydraulic system trouble free service in real time, a lot of research departments are to cause this factor of transmitted light decay to design multiple method of testing to pollutant solid particle in the fluid according to the solid particle in the fluid.But present test circuit adopts earlier more detection signal is amplified, and data is handled according to the corresponding tables of international pollution degree of hydraulic oil grade code and granule density by software processes test monitoring signal then, shows the grade of hydraulic oil.Existing in the market light blockage method granularity instrument all is that single session is measured, if distribution of particles is inhomogeneous or the overlapping of particle occur and will directly influence the accuracy of measurement result in the measured zone.For fear of the generation of this situation, we adopt three optical channels to come that fluid is detected and pass through data processing and obtain stablizing real result.Circuit of the present invention is directly to detection signal classification processing according to hardware design.Simplify the processing of software, improve testing precision.
Summary of the invention
The purpose of this invention is to provide a kind of contamination level of oil liquid and detect photoelectric switching circuit, it is simple to make it have light path design, characteristics such as wide, the simple to operate and measuring accuracy height of measurement range.
The present invention utilizes light blockage method to measure fluid particle contamination degree.Its principle is as follows:
After the light beam process convex lens refraction that semiconductor laser diode sends, become parallel beam, directional light is the optical glass window of A by sectional area, shine on the photoelectric receiving tube, when not having particle in the tested fluid, circuit output be a fixed voltage E, in fluid, have projected area be the particle of a by the test light hole, stopped parallel beam, make the transmitted light decay, this moment, output amplitude was E
0Pulse, E
0=(a/A) E;
If particle is spherical, or can equivalence be the sphere of d, then for diameter
E
0＝(πd
2E)/(4A)
The projected area and the pulse voltage amplitude that are particle are linear.Can judge the size of particle thus according to pulse height.The voltage signal of sensor is transferred to analog comparator, compares with the threshold voltage that each passage pre-sets, and relatively the output signal after connects the counter circuit of back, the number of coming count pulse (particle) with counter.Counter is provided with 6 comparator circuits (or passage).The setting value of each passage threshold voltage is linear with the grain size of passage, can be by divider resistance being set and this threshold voltage being set easily.When the voltage magnitude of single passage during greater than threshold voltage, comparer output high level, diode current flow, the rolling counters forward of this passage.By each passage is added up the granule number of just knowing the various sizes scope greater than the umber of pulse of this passage threshold voltage.But when particle is flowed through light-sensitive surface with different attitudes, also different to " blocking " effect of light, if pipe is tested this particle, get the size that maximum projection reflects particle, high many of the accuracy rate when testing with a single tube with three.The actual size that so just can reflect particle really.The design's design concept figure as shown in Figure 1.
Circuit photoelectric switching circuit of the present invention as shown in Figure 2, photoelectric switching circuit mainly comprises semiconductor laser light emitting diode and semiconductor laser reception diode, the requirement that luminous and sensitivity reception diode will touch the mark.Between luminotron and receiving tube, to add convex lens and a planar lens.Convex lens are used for parallel being radiated on the receiving tube of light that luminotron is sent.
Circuit photoelectric switching circuit of the present invention as shown in Figure 3, A1, A2 are operational amplifier OP27, T1 is a semiconductor laser diode, T2 is a light receiving tube.The T1 positive pole joins the direct ground connection of negative pole by resistance R 3 and+14V direct supply.Light receiving tube triode T2 collector links to each other with the input end 2 of operational amplifier A 1, and emitter links to each other with the input end 3 of operational amplifier A 1.Resistance R 1 two ends link to each other with output terminal 6 with the input end 2 of operational amplifier A 1 respectively, and resistance R 4 is connected the output terminal 6 of operational amplifier A 1 and the input end 3 of operational amplifier A 2.Resistance R 2 one ends link to each other with circuit publicly, one end links to each other with the input end 2 of operational amplifier A 2, link to each other with output terminal 6 with the input end 2 of operational amplifier A 2 respectively after capacitor C 1 and the potentiometer R5 parallel connection, the output terminal 6 of resistance R 6 concatenation operation amplifier A2 and the base stage of triode T3, the collector of triode T3 connects+direct supply of 14V, launch very being input in the passage of signal.
The light signal that sends when light emitting diode, become parallel beam after the planoconvex lens refraction, shine again on the photoresistance T2 after passing the test oil passage, photoelectric tube T2 conducting, flow through the current signal of T2 through the I-V of operational amplifier A 1 conversion becoming voltage signal, pass through amplification again, finally pass through the level conversion of T3, become processed signal by A2.In the circuit, for C1 as miller compensation, be mainly used in to eliminate and differ.
The circuit diagram of signal processing circuit (only illustrates with a passage) as shown in Figure 4:
In treatment circuit, treatment circuit is divided into two-way, each has different effects.Following a road as threshold adjustment circuit, and the direct current signal according to input carries out certain conversion process, exports six tunnel DC level (only drawing three tunnel), as the comparative voltage of the operational amplifier in six channels of entire circuit output.A road of top is the major part of entire circuit, is input as AC signal.Behind the amplitude limit and isolation through operational amplifier A 3, electric signal is delivered in the passage of six outputs, each passage all has different threshold voltages, and this threshold voltage is provided by following DC channel.After relatively, the output pulse square wave is exported testing result to the counter of each passage correspondence.In Fig. 3, U1 is the AC signal isolated amplifier of the signal of sensor output, and U2 is the direct current signal isolated amplifier of the signal of sensor output, and U4 is the amplitude limit unit of AC signal, and U5, U6, U7 are comparator circuit (being 3 in 6 passages).The setting value of its threshold value is by the dividing potential drop gained of DC level on slide rheostat of lower part, and threshold value can be by setting the adjustment of slide rheostat resistance.
In theory, particle is big more, and signal voltage is also big more, and when particle was wandered about as a refugee windowing along with fluid, signal just disappeared.So the number according to pulse can be determined quantity particles contained in the oil, can determine the size of particle according to the level of pulse.
Purpose of the present invention can adopt following technical scheme to realize: it comprises photosignal change-over circuit and electric signal classification treatment circuit two parts (only with a group pipe being described).
Described photoelectric commutator is a light activated element, can be complementary with LASER Light Source well by the size of adjusting integral time, and it is operated in the range of linearity, improves the accuracy of measurement of system.
Description of drawings
Accompanying drawing 1 is a schematic diagram of the present invention.
As can be seen from Figure 1: the present invention includes four main component units, they are relatively impulse output circuit sum counter circuit of photoelectric switching circuit, amplifying circuit, signal.
Accompanying drawing 2 is structural representations of the present invention.
Among the figure: from a left side to oil, be followed successively by semiconductor laser, lens, measuring sonde, light glass window, particle, I-V switching device.
Accompanying drawing 3 is signals collecting of the present invention and amplifying circuit.
Among the figure: the function of amplifier A1 is that the current signal that photoelectric tube produces is converted to voltage signal, and the function of amplifier A2 is that the faint voltage signal that A1 changes is amplified, so that the processing of subsequent conditioning circuit.
Accompanying drawing 4 is signal analysis and processing circuit of the present invention.
Among the figure: U1 is the amplification channel of AC signal, U2 is the amplification sampling passage of direct current signal, AC signal by U1 is through the threshold value comparer of the back of flowing through after amplifying, and the threshold value setting of comparer is obtained through the slide rheostat dividing potential drop by the output signal of U2 amplifier.The threshold value that each size particles is corresponding different, the intervention resistance of the slide rheostat by each road is set just can very easily voltage threshold be set to the corresponding representative value of each particle diameter on.U3 is the secondary circuit of the upper limit of AC signal output, in order to prevent the amplification to undesired signal, establishes the measuring accuracy that this amplitude limiter circuit can be improved circuit, reduces error., U5, U6, U7 are comparator circuit (being 3 in 6 passages).The setting value of its threshold value is by the dividing potential drop gained of DC level on slide rheostat of lower part, and threshold value can be by setting the adjustment of slide rheostat resistance.
Embodiment
In conjunction with the accompanying drawings, specify specific embodiments of the invention.
As shown in Figure 2: the present invention includes housing, semiconductor laser, measuring sonde, photoelectric switching circuit, I-V change-over circuit, comparator circuit sum counter counting circuit.Be provided with measuring sonde in housing, the measuring sonde two side is provided with optical glass window.One group of lens is set between measuring sonde and semiconductor laser, and the measuring sonde right side wall is provided with the corresponding side of optical glass window and is provided with photoelectric commutator, and the quantity of the lens of present embodiment is three, is oppositely arranged on the measuring sonde left side.The photoelectric commutator of present embodiment adopts light activated element, and light activated element is connected with comparator circuit sum counter counting circuit by the I-V change-over circuit.
As shown in Figure 2: the semiconductor laser planoconvex lens that gives off laser beam reflects into parallel beam, the optical glass window of the measuring sonde left side wall by tested sample, we allow fluid flow through the very little passage in transversal section, the passage left side wall is equipped with optical glass window, directional light shines fluid passage in the measuring sonde, through measuring sonde right side wall optical glass window, by the light beam behind the photoextinction of fluid passage particle, through the photoelectric commutator that light activated element is formed, after the rolling counters forward circuit count, export pulse number by producing six road pulse signals behind six road comparator circuits.
Claims (4)
1. three-dimensional oil contamination degree detector, it comprises that housing, semiconductor laser, measuring sonde, photoelectric switching circuit are with signal processing circuit.It is characterized in that: in housing, be provided with measuring sonde, one group of lens is set between measuring sonde and semiconductor laser, the measuring sonde right side wall is provided with the corresponding side of optical glass window and is provided with photoelectric commutator, and the signal processing circuit of photoelectric commutator output is handled.
2. three-dimensional oil contamination degree detector according to claim 1 is characterized in that: the measuring sonde two side is provided with optical glass window.
3. three-dimensional oil contamination degree detector according to claim 1 is characterized in that: described photoelectric commutator is a light activated element.
4. three-dimensional oil contamination degree detector according to claim 1 is characterized in that: lens numbers is three, is oppositely arranged between measuring sonde left side and the semiconductor laser.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810180597A CN101750273A (en) | 2008-12-03 | 2008-12-03 | Three-dimensional oil contamination degree detector |
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|---|---|---|---|
| CN200810180597A CN101750273A (en) | 2008-12-03 | 2008-12-03 | Three-dimensional oil contamination degree detector |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104067106A (en) * | 2014-06-30 | 2014-09-24 | 深圳华盛昌机械实业有限公司 | Particulate matter (PM) 2.5 concentration detection device and detection method, and air quality detector |
| CN104535480A (en) * | 2014-11-26 | 2015-04-22 | 四川凯乐检测技术有限公司 | Oil pollution degree detection sensor provided with fluorine-containing epoxy resin coating layer |
| CN105509116A (en) * | 2016-01-15 | 2016-04-20 | 广东万家乐燃气具有限公司 | Range hood with oil stain detection function |
| CN106153102A (en) * | 2015-04-09 | 2016-11-23 | 北京中联电科技术有限公司 | A kind of multiparameter integration fluid sensor based on iraser technology |
| CN106226211A (en) * | 2016-08-23 | 2016-12-14 | 上海杰视医疗科技有限公司 | The method of particulate matter content detection in the purposes of fluorine-containing alkane and silicone oil and/or weight silicone oil |
| CN106932317A (en) * | 2017-03-14 | 2017-07-07 | 中国人民解放军空军勤务学院 | A kind of non-dissolving water content on-line measuring device and detection method of jet fuel |
| CN107466364A (en) * | 2015-04-02 | 2017-12-12 | 奥里巴Abx股份有限公司 | The equipment counted to particle |
| CN107941664A (en) * | 2017-12-20 | 2018-04-20 | 天津博宜特科技有限公司 | Liquid particle detector |
| CN113161253A (en) * | 2021-01-25 | 2021-07-23 | 上海磬采电力科技开发有限公司 | Wafer surface impurity pollution degree detection system |
-
2008
- 2008-12-03 CN CN200810180597A patent/CN101750273A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104067106A (en) * | 2014-06-30 | 2014-09-24 | 深圳华盛昌机械实业有限公司 | Particulate matter (PM) 2.5 concentration detection device and detection method, and air quality detector |
| CN104067106B (en) * | 2014-06-30 | 2016-05-18 | 深圳华盛昌机械实业有限公司 | A kind of PM2.5 concentration detection apparatus, detection method and air quality detector |
| CN104535480A (en) * | 2014-11-26 | 2015-04-22 | 四川凯乐检测技术有限公司 | Oil pollution degree detection sensor provided with fluorine-containing epoxy resin coating layer |
| CN107466364A (en) * | 2015-04-02 | 2017-12-12 | 奥里巴Abx股份有限公司 | The equipment counted to particle |
| US10641697B2 (en) | 2015-04-02 | 2020-05-05 | Horiba Abx Sas | Device for counting particles |
| CN106153102A (en) * | 2015-04-09 | 2016-11-23 | 北京中联电科技术有限公司 | A kind of multiparameter integration fluid sensor based on iraser technology |
| CN106153102B (en) * | 2015-04-09 | 2019-05-03 | 北京中联电科技术有限公司 | A kind of multi-parameter integration oil liquid sensor based on infrared laser technology |
| CN105509116A (en) * | 2016-01-15 | 2016-04-20 | 广东万家乐燃气具有限公司 | Range hood with oil stain detection function |
| CN106226211A (en) * | 2016-08-23 | 2016-12-14 | 上海杰视医疗科技有限公司 | The method of particulate matter content detection in the purposes of fluorine-containing alkane and silicone oil and/or weight silicone oil |
| CN106932317A (en) * | 2017-03-14 | 2017-07-07 | 中国人民解放军空军勤务学院 | A kind of non-dissolving water content on-line measuring device and detection method of jet fuel |
| CN107941664A (en) * | 2017-12-20 | 2018-04-20 | 天津博宜特科技有限公司 | Liquid particle detector |
| CN113161253A (en) * | 2021-01-25 | 2021-07-23 | 上海磬采电力科技开发有限公司 | Wafer surface impurity pollution degree detection system |
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Open date: 20100623 |