CN108020524A - Lubricating oil moisture content detection device - Google Patents
Lubricating oil moisture content detection device Download PDFInfo
- Publication number
- CN108020524A CN108020524A CN201610951347.3A CN201610951347A CN108020524A CN 108020524 A CN108020524 A CN 108020524A CN 201610951347 A CN201610951347 A CN 201610951347A CN 108020524 A CN108020524 A CN 108020524A
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- China
- Prior art keywords
- infrared
- sample cell
- light source
- lubricating oil
- led drive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 238000001514 detection method Methods 0.000 title claims abstract description 29
- 239000010687 lubricating oil Substances 0.000 title claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 13
- 238000002835 absorbance Methods 0.000 claims abstract description 12
- 230000003321 amplification Effects 0.000 claims abstract description 12
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 6
- 230000002459 sustained effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 6
- 239000003921 oil Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000003760 hair shine Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The present invention relates to a kind of lubricating oil moisture content detection device, including LED drive system, absorbance detection system and data handling system, absorbance detection system includes middle infrared LED light source, sample cell and infrared detector, middle infrared LED light source is arranged on above sample cell, infrared detector is arranged on below sample cell, sample cell includes two infrared window pieces overlapped and the quoit being arranged between two infrared window pieces, LED drive system is used for infrared LED light source luminescent in driving, data handling system includes signal amplification circuit and data processing unit, infrared detector connects signal amplification circuit, signal amplification circuit connects data processing unit.The present invention is driven LED light source using constant-current drive circuit, detects absorbance of the LED light source through sample cell by infrared detector, realizes the detection to Moisture in Lube Oil ＆ content；With the characteristics of easy to operate, cost is low, required sample size is few, and accuracy of detection is high, the Site Detection to lubricating oil is applicable to.
Description
Technical field
The present invention relates to LED light source applied technical field, more particularly to a kind of lubricating oil water content detection based on LED light source
Device.
Background technology
Due to the use of the difference of environment, moisture is easily accessible in the lubricating oil of engine system under certain operating conditions,
Lubricating oil is subject to moisture contamination and is destroyed lubricating oil film, cause abrasion, the corrosion of metal parts occur between part, and its with
Lube oil additive, which reacts, makes additives function fail, and accelerates lubricants performance to deteriorate, and changes the viscosity of fluid.With
The development of Oil Monitoring Technique, has formd the standard method of moisture in a variety of common measurement fluid, every kind of method at present
All there is respective and deficiency.As way of distillation cost is low, precision of measurement is very high, but needs sample size more, take compared with
It is long；Karl_Fischer method high certainty of measurement, speed are fast, applied widely, but instrument is more expensive, it is necessary to which coordinating with precision balance makes
With being only suitable for using in laboratory, and need to use harmful Cattell reagent；Gravimetric method is easy to operate, instrument is set
Standby expense is relatively low, and the requirement to operating personnel is relatively low, when shortcoming is that moisture is high in sample, in measurement process
It can splash, influence measurement accuracy, in addition, there are can make measurement result bigger than normal during low-boiling point material in sample；Fourier becomes
It is fast to change infrared spectroscopy measuring speed, does not destroy and consume sample, non-environmental-pollution, but needs to use Fourier transformation
Infrared spectrometer, equipment is complicated and operating personnel is required high.
The content of the invention
It is an object of the invention to solve above-mentioned technical problem existing for existing measuring device and method, there is provided one kind operation
Simply, sample size needed for detection is few, suitable for the lubricating oil moisture content detection device of Site Detection.
In order to solve the above technical problems, present invention employs following technical scheme：
Lubricating oil moisture content detection device, including LED drive system, absorbance detection system and data handling system, it is described
Absorbance detection system includes middle infrared LED light source, sample cell and infrared detector, and middle infrared LED light source is arranged on sample cell
Top, infrared detector are arranged on below sample cell, and the sample cell includes two infrared window pieces overlapped and setting
Quoit between two infrared window pieces, the LED drive system are used for infrared LED light source luminescent in driving, the number
Include signal amplification circuit and data processing unit according to processing system, the infrared detector connects signal amplification circuit, signal
Amplifying circuit connects data processing unit.
In above-mentioned technical proposal, further, the LED drive system includes regulated power supply, oscillating circuit and LED drivings
Circuit, is connected between the oscillating circuit and LED drive circuit by voltage comparator, and regulated power supply, oscillating circuit and LED drive
Dynamic circuit connects regulated power supply respectively.
In above-mentioned technical proposal, further, the LED drive circuit includes driving chip, capacitance C2, resistance R5, hair
Optical diode D1, sustained diode 2 and ballast inductance L1, the capacitance C2 are connected to the VIN ends and GND ends of driving chip
Between, between the VIN ends and CSN ends of the resistance R5 connections driving chip, the light emitting diode D1, ballast inductance L1 are successively
Be connected between the CSN ends of driving chip and SW ends, the sustained diode 2 be connected to the VIN ends of driving chip and SW ends it
Between, the DIM ends of the driving chip are connected with LTH35 voltage comparator output terminals.
In above-mentioned technical proposal, further, the quoit be a diameter of 90~120 μm groups of metal filaments into metal
Ring structure.
The present invention is driven LED light source using constant-current drive circuit, ensures that LED light source has the luminous strong of stabilization
Degree；Absorbance of the LED light source through sample cell is detected by infrared detector, realizes the detection to Moisture in Lube Oil ＆ content；
With the characteristics of easy to operate, installation cost is low, and required sample size is few, and accuracy of detection is high, the scene to lubricating oil is applicable to
Detection.
Brief description of the drawings
Fig. 1 is structure diagram of the present invention.
Fig. 2 is absorbance detection system structure diagram of the present invention.
Fig. 3 is LED drive circuit figure of the present invention.
In figure：1st, middle infrared LED light source, 2, infrared window piece, 3, quoit, 4, infrared detector.
Embodiment
The present invention is further illustrated with specific embodiment below in conjunction with the accompanying drawings.
Such as Fig. 1, lubricating oil moisture content detection device in the present embodiment, including LED drive system, absorbance detection system sum number
According to processing system, absorbance detection system includes middle infrared LED light source, sample cell and infrared detector, and middle infrared LED light source is set
Put above sample cell, infrared detector is arranged on below sample cell, and sample cell includes two infrared window pieces overlapped
And the quoit being arranged between two infrared window pieces, LED drive system are used for infrared LED light source luminescent in driving, data
Processing system includes signal amplification circuit and data processing unit, infrared detector connection signal amplification circuit, signal amplification electricity
Road connects data processing unit, and data processing unit uses microcontroller.
Regulated power supply output size is the DC voltage of 5V, is modulated into 1kHz square-wave signals through oscillating circuit, then pass through perseverance
Infrared LED shines in stream drive circuit excitation, and constant current driving can ensure that the luminous intensity of LED is stablized relatively.Infrared LED is sent
Infrared light sample cell, part energy reflected by infrared window piece, and a part is absorbed by oil sample, it is remaining reach it is infrared
The light intensity signal received is converted to analog electrical signal by detector, infrared detector；The signal through AC amplifier one to
Digital signal is converted to by A/D converter after three-stage amplifier amplification, and is transmitted to C8051F350 microcontrollers, final transmission
To host computer, the water content in fluid is obtained.
LED drive system includes regulated power supply, oscillating circuit and LED drive circuit, the oscillating circuit and LED driving electricity
Connected between road by voltage comparator, regulated power supply, oscillating circuit and LED drive circuit connect regulated power supply respectively.Vibration
Circuit uses NE555 timers, and the outer connecting resistance of NE555 timers, capacitance form adjustable pulse width multivibrator.Utilize NE555
Timer produces sawtooth waveforms, then produces PWM ripples by LTH35 voltage comparators, effectively prevent start transient state and causes LED to damage
It is bad, extend LED life.
As shown in figure 3, the constant current driver circuit for LED of the present embodiment include PT4115 driving chips, capacitance C2, resistance R5,
Light emitting diode D1, sustained diode 2 and ballast inductance L1；Capacitance C2 be connected to the VIN ends of PT4115 type driving chips with
Between GND ends；Resistance R5 is connected between the VIN ends of PT4115 driving chips and CSN ends；Light emitting diode D1, ballast inductance
L1 is connected in turn between the CSN ends of PT4115 driving chips and SW ends；Between resistance R5 and ballast inductance L1 it is in parallel several
Light emitting diode D1, sustained diode 2 are connected between the VIN ends of PT4115 driving chips and SW ends；PT4115 driving chips
DIM ends be connected with 5 output terminal of LTH35 voltage comparators.PT4115 driving chips are a continuous inductive current conduction modes
Decompression constant current source chip, DC voltage can be directly changed into stable constant current output, its use 6~30V Width funtions input,
Output current is up to 1.2A, and transfer efficiency is up to 97%, and output current precision reaches ± 5%.The LED drive circuit has circuit letter
The features such as list, reliability are high, degree of regulation is high, low in energy consumption, cost is low.
In the present embodiment, such as Fig. 2, absorbance detection system includes middle infrared LED light source 1, sample cell and infrared detector
4.Middle infrared LED light source of the peak emission wavelength for 2840nm is used, the characteristics of it is good with monochromaticjty, and transmission power is big.Institute
State sample cell to form using two infrared window pieces 2 and quoit 3, quoit 3 is arranged between two infrared window pieces 2.Two
Infrared window piece uses CaF2Diaphragm, CaF2Diaphragm is not easy deliquescence, and through a length of 120~9000nm of light wave, transmitance is more than
90%；Quoit be using metal ring structure made of a diameter of 100 μm of wires, quoit be arranged on two infrared window pieces it
Between contacted between two infrared window pieces for line, it is ensured that the precision of oil film thickness in sample cell, so as to ensure.Middle infrared LED
Light source is arranged on above sample cell, and infrared detector is arranged on below sample cell, in receiving after oil film in sample cell absorbs
Infrared light.The light intensity signal received is converted to voltage signal by infrared detector.
The present invention specification and drawings be considered as it is illustrative and not restrictive, on the basis of the present invention, ability
Field technique personnel are according to disclosed technology contents, it is not necessary to which performing creative labour can make some of technical characteristics
Some are replaced and deformation, within the scope of the present invention.
Claims (4)
1. lubricating oil moisture content detection device, it is characterised in that：Including LED drive system, absorbance detection system and data processing
System, the absorbance detection system include middle infrared LED light source, sample cell and infrared detector, and middle infrared LED light source is set
Above sample cell, infrared detector is arranged on below sample cell, and the sample cell includes two infrared windows overlapped
Piece and the quoit being arranged between two infrared window pieces, the LED drive system are used for infrared LED light source in driving and send out
Light, the data handling system include signal amplification circuit and data processing unit, the infrared detector connection signal amplification
Circuit, signal amplification circuit connection data processing unit.
2. lubricating oil moisture content detection device according to claim 1, it is characterised in that：The LED drive system includes steady
Voltage source, oscillating circuit and LED drive circuit, are connected between the oscillating circuit and LED drive circuit by voltage comparator,
Regulated power supply, oscillating circuit and LED drive circuit connect regulated power supply respectively.
3. lubricating oil moisture content detection device according to claim 2, it is characterised in that：The LED drive circuit includes driving
Dynamic chip, capacitance C2, resistance R5, light emitting diode D1, sustained diode 2 and ballast inductance L1, the capacitance C2 are connected to
It is described to shine between the VIN ends and CSN ends of the resistance R5 connections driving chip between the VIN ends and GND ends of driving chip
Diode D1, ballast inductance L1 are connected in turn between the CSN ends of driving chip and SW ends, and the sustained diode 2 is connected to
Between the VIN ends and SW ends of driving chip, the DIM ends of the driving chip are connected with LTH35 voltage comparator output terminals.
4. lubricating oil moisture content detection device according to claim 1, it is characterised in that：The quoit for a diameter of 90~
120 μm of groups of metal filaments into metal ring structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610951347.3A CN108020524A (en) | 2016-11-02 | 2016-11-02 | Lubricating oil moisture content detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610951347.3A CN108020524A (en) | 2016-11-02 | 2016-11-02 | Lubricating oil moisture content detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108020524A true CN108020524A (en) | 2018-05-11 |
Family
ID=62070073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610951347.3A Pending CN108020524A (en) | 2016-11-02 | 2016-11-02 | Lubricating oil moisture content detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108020524A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109406448A (en) * | 2018-10-25 | 2019-03-01 | 四川长虹电器股份有限公司 | Infrared spectrometer |
| EP3907982A4 (en) * | 2019-05-08 | 2022-06-22 | Hangzhou Hikvision Digital Technology Co., Ltd. | Camera |
-
2016
- 2016-11-02 CN CN201610951347.3A patent/CN108020524A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109406448A (en) * | 2018-10-25 | 2019-03-01 | 四川长虹电器股份有限公司 | Infrared spectrometer |
| EP3907982A4 (en) * | 2019-05-08 | 2022-06-22 | Hangzhou Hikvision Digital Technology Co., Ltd. | Camera |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180511 |
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| WD01 | Invention patent application deemed withdrawn after publication |