CN201974383U - Pulse optical source fibre oxygen detector - Google Patents
Pulse optical source fibre oxygen detector Download PDFInfo
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- CN201974383U CN201974383U CN2011200164145U CN201120016414U CN201974383U CN 201974383 U CN201974383 U CN 201974383U CN 2011200164145 U CN2011200164145 U CN 2011200164145U CN 201120016414 U CN201120016414 U CN 201120016414U CN 201974383 U CN201974383 U CN 201974383U
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Abstract
The utility model discloses a pulse optical source fibre oxygen detector, which is characterized in that the pulse optical source fibre oxygen detector comprises a Y-type 2-input 1-output optical path component (3); one inlet port of the Y-type 2-input 1-output optical path component (3) is connected with a light emitting device; the other inlet port of the Y-type 2-input 1-output optical path component (3) is connected with a probe (8); a fluorescent coating (4) capable of exciting red light is coated on the probe (8); an oxygen permeable polymer membrane is arranged on the fluorescent coating (4); one outlet port of the Y-type 2-input 1-output optical path component (3) is connected with a current induction device capable of converting fluorescent excitation volume into current; the light emitting device consists of a pulse optical source (1) capable of emitting blue light, and a narrow band pass filter (2); and the current induction device consists of a long pass filter (5), a focusing lens (6), and a photoelectric detector (7). The pulse optical source fibre oxygen detector has simple structure, good stability and long service life.
Description
Technical field
The utility model relates to a kind of surveying instrument, the device of field test solutions such as especially a kind of chemical industry, medicine, environment, water oxygen level, specifically a kind of light-pulse generator optical fiber oxygen analyser.
Background technology
Dissolved oxygen DO is called for short dissolved oxygen, is meant the content that is dissolved in solution or water oxygen gas.Dissolved oxygen sensor or title dissolved oxygen meter are widely used in the measurement of the dissolved oxygen content under the various occasions, the flow process that is used for can influencing oxygen content reaction velocity, flow path efficiency or environment is monitored, especially culture water, photosynthesis and respiration and in-site measurement, environmental testing (lake, small stream, ocean), water treatment, wastewater treatment, Production of Wine etc.When the ability of stream and the survival of lake water biological support is assessed, carry out biochemical oxygen demand test (BOD); When consuming containing of oxygen organic sample aqueous solution becomes rotten, it is measured and definite oxyty and sample aqueous solution temperature between relation.
At present, what known dissolved oxygen assay adopted is electrochemical method, even with the electrochemistry oxygen sensor or be septum electrode [Clark, L. C., Electrochemical devices for chemical analysis, US patent, 1959, No. 2 913 386.], convert oxygen concentration (or partial pressure of oxygen) to electric signal, through amplifying, adjusting (comprising salinity, temperature compensation), show after the analog to digital conversion again.The septum electrode that dissolved oxygen meter uses has two types: polarogram type (Polarography) and galvanic cell type (Galvanic Cell).In the polarogram type electrode, make negative electrode by gold or platinum, silver is made anode, and electrolytic solution is Klorvess Liquid, and cathode outer surface covers one deck oxygen flow film.Film can adopt gas permeable materials such as teflon, Polyvinylchloride, tygon, silicon rubber.Add 0.5～1.5 volt of bias voltage between negative and positive two electrodes, electrode is polarized; After the electrode polarization, the electrode current of generation is linear with the amount of oxygen that is diffused into electrode surface, promptly is directly proportional with oxyty.The similar polarogram type of galvanic cell type, but anode is made up of lead or zinc, and electrolytic solution is potassium hydroxide solution; Because lead anode corroded by potassium hydroxide solution, generate plumbous potassium hydrogen phthalate, simultaneously to external circuit output electronics, so the voltage of primary element formula is spontaneous generation and need not extraneous providing.Connect external circuit (load) afterwards, just have marking current to pass through, its value is directly proportional with oxyty.Though the galvanochemistry oximetry is subjected to widespread use, but it still has limitation, mainly be because electrochemical method is oxygen consumption on principle, electric signal is relevant with oxygen is delivered to electrode surface from surrounding medium mass transport process and mass transfer rate, so the flowing velocity of solution, stirring, viscosity change the stability and the accuracy that all can influence the electrochemistry oxygen sensor.Moreover, the electrochemistry oxygen sensor can't be measured high sample of viscosity such as the dissolved oxygen amount in blood plasma, the gel etc.
For remedying the deficiency of electrochemistry oxygen sensor, relatively more novel optics oximetry methods is studied [Bergmann, I., Nature, 1968 gradually, 218,396. Lubbeers, D. W., Opitz, N., Z. Naturforsch. Teil C, 1975,30,532].The oxygen analyser of employing optical sensor advances one by light source, photodetector, two and goes out trident optical fiber, and fibre-optical probe is formed.Light source is generally laser, light emitting diode or bulb, and the blue light that sends (420 – 490nm) advances an end that outes optical fiber by two and enters, and shines on the fluorescence chemical material (being generally metallo-chelate) that is embedded in the fibre-optical probe; Fluorescence chemical material stimulated luminescence irradiation back is from the ground state transition to excited state.Excited state is short-life, is easy to turn back to ground state, emits unnecessary energy simultaneously.The approach of this fluorescent material excited state deactivation is a radiation transistion, promptly sends red fluorescence (550 – 700nm).Red fluorescence advances an other end that outes optical fiber by two and is received by photodetector.Fluorescence intensity is relevant with the oxygen content in the fibre-optical probe surrounding medium, and reason is that fluorescent material excited state can be got back to ground state by radiationless transition by oxygen cancellation on every side.This cancellation process is a dynamic reversible, and promptly fluorescence intensity changes with oxygen content on every side.Oxygen concentration relation in fluorescence intensity and the surrounding medium meets the Stern-Volmer equation, just can accurately record the content of oxygen after therefore instrument being proofreaied and correct in the medium of known dissolved oxygen content.This shows that the optical oxygen sensing device is oxygen consumed not,, and can measure dissolved oxygen content in the high viscosity samples exactly so measured signal is not subjected to the interference of flow of solution state.
At present known optical oxygen sensing device or optical fiber oxygen analyser all adopt continuous light source [4-8] to measure fluorescence intensity, and promptly exciting light is to be radiated at constantly on the fibre-optical probe fluorescent material.Its advantage is that because of excitation source is in the continuous firing state, signal is relatively stable at short notice.But shortcoming is, because light source is continuous, fluorescent material under the incident light prolonged exposure light degradation deactivation can take place slowly, thus the long-time stability variation, and showing is exactly that drift phenomenon is serious.
Summary of the invention
The purpose of this utility model is poor at the long-time stability of existing optical fiber oxygen analyser, and signal is the problem of drift easily, designs a kind of good stability, the light-pulse generator optical fiber oxygen analyser that power consumption is little.
The technical solution of the utility model is:
A kind of light-pulse generator optical fiber oxygen analyser, it is characterized in that it comprises that a triadius type two advances one and goes out optical path component 3, triadius type two advances an entrance point that outes optical path component 3 and links to each other with light-emitting device, triadius type two advances another entrance point that outes optical path component 3 and is connected with probe 8, be coated with the fluoresent coating 4 that can inspire ruddiness on the probe 8, fluoresent coating 4 is provided with the oxygen flow polymeric membrane, and triadius type two advances an endpiece that outes optical path component 3 and is connected with the current sensing means that the fluorescence excitation amount can be converted to electric current; Described light-emitting device is made up of the light-pulse generator 1 that can send blue light and narrow band pass filter 2, blue light that light-pulse generator 1 is sent enters triadius type two through narrow band pass filter 2 and advances one and go out in the entrance point of optical path component 3, described current sensing means is made up of long pass filter 5, condenser lens 6 and photodetector 7, triadius type two advance one go out optical module 3 endpiece reflected light through long pass filter 5 filter and condenser lens 6 focusing after be radiated on the photodetector 7 and produce induction current.
Described triadius type two advances one and goes out optical path component 3 and be diameter two advancing and go out trident optical fiber or two advanced and go out structure by what optical element was formed by pure between the 10-1000 micron.
The opening time of described light-pulse generator 1, the shut-in time was between 1 millisecond to 10 minutes between 0.1 millisecond to 10 seconds.
Described light-pulse generator 1 is laser, LED, tungsten lamp, xenon lamp or deuterium lamp, effectively shines light wavelength between 420 – 490nm, and the center of described narrow band pass filter 2 is between 420 – 490nm.
The red fluorescence wavelength that sends after the fluorescent material that applies on the described probe 8 is stimulated is between 550 – 700nm.
Described photodetector 7 is photodiode, photomultiplier or CCD; The cutoff wavelength of described long pass filter 6 is between 550-700nm.
Described light-pulse generator optical fiber oxygen analyser also comprises a temperature sensor.
Described temperature sensor is the built-in structure that is built in the probe.
Described probe 8 is a stainless-steel tube, one end of stainless-steel tube is provided with respectively with triadius type two and advances an optical cable interface 9 that entrance point links to each other with an endpiece that outes optical module 3, be coated with fluorescent material 4 on the other end of stainless-steel tube, be covered with the oxygen flow macromolecule membrane on the fluorescent material 4, the oxygen flow macromolecule membrane is provided with the black polymeric coating layer that stops interference of stray light outward.
An end that is coated with fluorescent material 4 of described stainless-steel tube probe 8 is the tip-angled shape structure so that the puncture sample, and the angle of wedge angle is between the 30-60 degree.
Essence of the present utility model is to use a pulse excitation light source, makes incident light intermittently shine fluorescent material, and fluorescent material is actual in same usage time interval shortened greatly by the time of illumination thereby make.The typical light-pulse generator opening time, the shut-in time can be between 1 millisecond to 10 minutes between 0.1 millisecond to 10 seconds.Show speed (being that per test in 1 second shows 1 time) and use 10 milliseconds of light pulses to be example that with 1 hertz sampling light-pulse generator is opened 10 milliseconds, closes 990 milliseconds, begins next circulation then; That is to say in 1 second, to have only 1% time light source to open, therefore shortened the illuminated time of fluorescent material greatly.Show that with 0.1 hertz sampling speed (per test in 10 seconds shows 1 time) be example again, 10 milliseconds of light-pulse generator unlatchings are closed 9990 milliseconds, begin next circulation then, promptly in 10 seconds, have only millesimal time light source to open.Adopt the optical fiber oxygen analyser long-time stability of this new technology to improve greatly, tangible fluorescent material light degradation deactivation phenomenon does not take place in the continuous working several months.Because excitation source only opens very short time, electrical source consumption reduces greatly, and electrical source consumption has only 1/10th of the same quasi-instrument that uses continuous light source usually.
The beneficial effects of the utility model:
The utility model is the power consumption of lowering apparatus obviously, makes open-air optical fiber oxygen analyser mission life longer, so be applicable to long-term online detection, monitoring and file record dissolved oxygen data.Fibre-optical probe has oxygen consumption not and is not subjected to the characteristics of flow of solution state disturbing effect, makes the utility model can be applied to the Continuous Contact monitoring of oxygen in high viscosity solution and the sample.The utility model can be operated by computer software control and under the environment that computing machine Window supports, the very convenient user of software design, user can easily rectify an instrument, gather and show data neatly, change parameter and deal with data.Correction can adopt one point method (at the water of 100% saturation of the air, or in the air) or two-point method to proofread and correct (water of 100% and 0% saturation of the air, or in air and nitrogen) simply.
Oxygen determination and temperature probe all adopt 316 stainless steel materials to make, and can be applicable to coenocorrelation, available EtO (ethylene oxide), hydrogen peroxide ， Gao Green acid sodium and the aseptic sterilization of Gamma ray.Probe must not keep wetting, makes it both can detect dissolved oxygen, can detect gox yet.The additional simultaneously accurate temp sensing function of lambda sensor; When using the Fiber Optic Oxygen probe, only need an external stainless steel temp probe.
With prior art relatively, the utlity model has following outstanding advantage: 1) eliminate fluorescent material Stimulated Light degraded deactivation phenomenon, prolong the serviceable life of optic probe; 2) greatly improve the long-time stability of optics dissolved oxygen sensor; 3) power consumption of obvious lowering apparatus prolongs open-air optical fiber dissolved oxygen meter work limitation; 4) sensor stability and favorable reproducibility reach 0.02ppm (being mg/L); 5) dynamic range is wide, between 0-480 mmHg or 0-25ppm or 0%-300% air saturation; 6) response time fast, T90 is 10 seconds; 7) anti-interference is good, and the change and the dirt of electric field, magnetic field, different chemical product and gaseous environment, pH value, salinity, ionic strength all had immunity; 8) owing on detecting head surface fluorescent material film, plate one deck black macromolecular material diaphragm again, do not influence so there is interference of stray light; 9) use simply, it is very convenient to proofread and correct, and simply one point method is proofreaied and correct (in the water of 100% saturation of the air or in the air); 10) the low maintenance need not be changed electrolytic film, filling electrolyte and carry out time-consuming polarization; 11) oxygen consumption not, no flow interfering makes it can detect high viscosity samples.
The utility model can be widely used in Measurement for Biochemistry (as cellular incubation, fermentation, and biological sample), medical research, colleges and universities and scientific experiment chamber, biological oxygen demand (BOD) (BOD), Food ﹠ Drink production industry fields such as (as packaging for foodstuff and soft drink bottlings).
Description of drawings
Fig. 1 is a structural principle synoptic diagram of the present utility model.
Fig. 2 is the sectional structure synoptic diagram of stainless steel probe of the present utility model.
Fig. 3 is an electrical principle synoptic diagram of the present utility model.
Fig. 4 is a light-pulse generator working timing figure of the present utility model.
Fig. 5 is that the output signal of optical fiber oxygen analyser of the present utility model is that fluorescence intensity weakens with the increase of oxygen percentage concentration.Fluorescence intensity changes the working curve that obtains with oxygen concentration and is used to rectify an instrument.
Fig. 6 is the responsive operation curve of optical fiber oxygen analyser of the present utility model when alternately being exposed in nitrogen (0% oxygen) and the air (20.9% oxygen).Response time (T90) is 10 seconds.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
Shown in Fig. 1-6.
A kind of light-pulse generator optical fiber oxygen analyser, it comprises that a triadius type two advances one and goes out optical path component 3, triadius type two advances an entrance point that outes optical path component 3 and links to each other with light-emitting device, triadius type two advances another entrance point that outes optical path component 3 and is connected with probe 8, be coated with the fluoresent coating 4 that can inspire ruddiness on the probe 8, fluoresent coating 4 is provided with the oxygen flow polymeric membrane, and triadius type two advances an endpiece that outes optical path component 3 and is connected with the current sensing means that the fluorescence excitation amount can be converted to electric current; Described light-emitting device is made up of the light-pulse generator 1 that can send blue light and narrow band pass filter 2, blue light that light-pulse generator 1 is sent enters triadius type two through narrow band pass filter 2 and advances one and go out in the entrance point of optical path component 3, described current sensing means is made up of long pass filter 5, condenser lens 6 and photodetector 7, triadius type two advance one go out optical module 3 endpiece reflected light through long pass filter 5 filter and condenser lens 6 focusing after be radiated on the photodetector 7 and produce induction current.As shown in Figure 1.Wherein light-pulse generator 1 is sent blue light, after narrow band pass filter 2 optical filterings, enter two and advance an end that outes trident optical fiber 3, by the optical fiber common port, shine on the phosphor layer 4 that is plated in optical fiber connector, fluorescent material is subjected to send red fluorescence (550-700nm) after the optical excitation, and this red fluorescence is launched back the other end of trident optical fiber, after long pass filter 5 optical filterings, lens 6 focusing, received by photodetector 7.By the photocurrent size measurement fluorescence intensity of detection photodetector generation, thereby record oxygen concentration.
Fig. 2 is the structural representation of stainless steel probe 8 of the present invention.Probe 8 is an external diameter 3.18mm, and 316 stainless-steel tubes of length 6.4cm, an end have a stainless steel optical cable interface 9(model and can be SMA905), the silica fibre core line diameter is 1000 μ m.Fluorescent material is plated in detecting head surface with the oxygen flow polymer matrix membrane and forms fluorescence coating 4, and one deck black macromolecular material is to stop the disturbing effect of parasitic light. and probe tip is worn into miter angle (also can be between the 30-60 degree arbitrarily angled) so that puncture sample thin film and some soft sample.In addition, also can prepare the temperature sensor of an accurate thermometric when specifically implementing so that carry out the adjustment and the setting of correlation parameter according to temperature variation, temperature sensor can add also and can integrate with the stainless steel probe.
Optical fiber oxygen analyser electrical principle as shown in Figure 3, computing machine 10 is connected with data acquisition control plate 11 by USB interface, data acquisition control plate 11 connects little Current Regulation and amplifies and light source control wiring board 12, electric current amplifies and control circuit board 12 is inner at instrument casing and the optics of optical fiber oxygen sensor and hardware system 13 connections, thereby the control light source is by pulse sequence switch and the synchronous acquisition fluorescence intensity data set.+ 5V direct supply 14 is for data acquisition control plate 11 and electric current amplifies and control circuit board 12 provides power supply.Control circuit shown in Figure 3 all can adopt the textbook circuit common to be realized.
Fig. 4 is an optical fiber oxygen analyser pulse excitation light source works sequential chart of the present invention.Horizontal ordinate is the time among Fig. 4, and ordinate is the intensity of light source.The typical light-pulse generator opening time, the shut-in time can be between 1 millisecond to 10 minutes between 0.1 millisecond to 10 seconds.Adopting the sampling of 0.2Hz to show speed (per test in 5 seconds shows 1 time) and 10 milliseconds of light-pulse generators during actual tests, also is that light source starts 10 milliseconds, closes 4990 milliseconds, begins next circulation then.The output signal of the actual optical fiber oxygen sensor that records, i.e. fluorescence intensity, the working curve that changes with oxygen concentration is as shown in Figure 5.Fig. 5 shows that fluorescence intensity increases with the oxygen percentage concentration and weakens.Fluorescence intensity changes the working curve that obtains with oxygen concentration and is used to rectify an instrument.The calibrated back of optical fiber dissolved oxygen meter directly shows the oxygen concentration of testing medium and shows with six kinds of different units, comprising: oxygen bias voltage (mmHg, mm Hg), oxygen bias voltage (mbar, millibar), air saturation (%Air), Oxygen saturation (%O
2), mg/litre (mg/L, i.e. ppm) and mM(mM), and be presented at 6 virtual strip chart recorders and show the determination data trend on the computer screen continuously.The optical fiber dissolved oxygen meter can also compensate pressure, temperature, relative humidity and salinity.
Responsive operation curve when Fig. 6 alternately is exposed in nitrogen (0% oxygen) and the air (20.9% oxygen) for the optical fiber oxygen analyser.Test result shows, instrument has very high sensitivity (0.02ppm), superior long-time stability (0.01ppm/24 hour) and response time (T90=10 second) fast.Because plating one deck black macromolecular material outside on detecting head surface fluorescent material film is not so there is the interference of stray light influence.Optical fiber dissolved oxygen meter of the present invention is to operate by computer software control and under the environment that computing machine Window supports, the very convenient user of software design, user can easily rectify an instrument, gather and show data neatly, change parameter and deal with data.
During concrete enforcement, triadius type two advances one and goes out optical path component 3 and can directly adopt diameter two advancing and go out trident optical fiber and realized between the 10-1000 micron, also can adopt by pure two to be advanced one and go out structure by what optical element was formed.For optical designers, adopt optical element to set up the optical path component 3 that satisfies the utility model requirement and be easy to realize, also be equivalence design of the present utility model.
For light-pulse generator 1 and the side, its opening time can be controlled between 0.1 millisecond to 10 seconds, and the shut-in time can be controlled between 1 millisecond to 10 minutes, can realize easily regulating by suitable panel adjusting or computor-keyboard and software operation.
Light-pulse generator 1 can adopt a kind of in laser, LED, tungsten lamp, xenon lamp or the deuterium lamp during concrete enforcement, effective irradiation light wavelength of light source should be controlled between the 420 – 490nm, and the center of corresponding narrow band pass filter 2 also should be controlled between 420 – 490nm.
The red fluorescence wavelength that sends after the fluorescent material that applies on the probe 8 during concrete enforcement is stimulated can be selected the fluoresent coating between the 550 – 700nm for use.
The utility model does not relate to the part prior art that maybe can adopt all same as the prior art to be realized.
Claims (10)
1. light-pulse generator optical fiber oxygen analyser, it is characterized in that it comprises that a triadius type two advances one and goes out optical path component (3), triadius type two advances an entrance point that outes optical path component (3) and links to each other with light-emitting device, triadius type two advances another entrance point that outes optical path component (3) and is connected with probe (8), be coated with the fluoresent coating (4) that can inspire ruddiness on the probe (8), fluoresent coating (4) is provided with the oxygen flow polymeric membrane, and triadius type two advances an endpiece that outes optical path component (3) and is connected with the current sensing means that the fluorescence excitation amount can be converted to electric current; Described light-emitting device is made up of the light-pulse generator that can send blue light (1) and narrow band pass filter (2), blue light that light-pulse generator (1) is sent enters triadius type two through narrow band pass filter (2) and advances one and go out in the entrance point of optical path component (3), described current sensing means is made up of long pass filter (5), condenser lens (6) and photodetector (7), and triadius type two advances a reflected light that outes the endpiece of optical module (3) and be radiated at upward generation induction current of photodetector (7) after long pass filter (5) optical filtering and condenser lens (6) focusing.
2. light-pulse generator optical fiber oxygen analyser according to claim 1 is characterized in that described triadius type two advances one and goes out optical path component (3) and be diameter two advancing and go out trident optical fiber or two advanced and go out structure by what optical element was formed by pure between the 10-1000 micron.
3. light-pulse generator optical fiber oxygen analyser according to claim 1, the opening time that it is characterized in that described light-pulse generator (1), the shut-in time was between 1 millisecond to 10 minutes between 0.1 millisecond to 10 seconds.
4. light-pulse generator optical fiber oxygen analyser according to claim 1, it is characterized in that described light-pulse generator (1) is laser, LED, tungsten lamp, xenon lamp or deuterium lamp, effectively the irradiation light wavelength is between 420 – 490nm, and the center of described narrow band pass filter (2) is between 420 – 490nm.
5. light-pulse generator optical fiber oxygen analyser according to claim 1, the red fluorescence wavelength that it is characterized in that sending after the last fluorescent material that applies of described probe (8) is stimulated is between 550 – 700nm.
6. light-pulse generator optical fiber oxygen analyser according to claim 1 is characterized in that described photodetector (7) is photodiode, photomultiplier or CCD; The cutoff wavelength of described long pass filter (6) is between 550-700nm.
7. light-pulse generator optical fiber oxygen analyser according to claim 1 is characterized in that it also comprises a temperature sensor.
8. light-pulse generator optical fiber oxygen analyser according to claim 7 is characterized in that described temperature sensor is the built-in structure that is built in the probe.
9. light-pulse generator optical fiber oxygen analyser according to claim 1, it is characterized in that described probe (8) is a stainless-steel tube, one end of stainless-steel tube is provided with respectively and advances the optical cable interface (9) that an entrance point that outes optical module (3) links to each other with an endpiece with triadius type two, be coated with fluorescent material (4) on the other end of stainless-steel tube, fluorescent material is covered with the oxygen flow macromolecule membrane on (4), and the oxygen flow macromolecule membrane is provided with the black polymeric coating layer that stops interference of stray light outward.
10. light-pulse generator optical fiber oxygen analyser according to claim 9, an end that is coated with fluorescent material (4) that it is characterized in that described stainless-steel tube probe (8) is the tip-angled shape structure so that the puncture sample, and the angle of wedge angle is between the 30-60 degree.
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| GB2509716A (en) * | 2013-01-09 | 2014-07-16 | Internat Moisture Analysers Ltd | Optical chemical analyser and liquid depth sensor |
| CN104251847A (en) * | 2013-06-28 | 2014-12-31 | 天津奇谱光电技术有限公司 | Fluorescence method optical fiber sensing system |
| CN107923599A (en) * | 2015-08-24 | 2018-04-17 | 亮锐控股有限公司 | Lighting apparatus for headlight for vehicle |
| CN112697762A (en) * | 2021-01-07 | 2021-04-23 | 中山复旦联合创新中心 | High-precision dissolved oxygen meter system and special SoC |
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2011
- 2011-01-19 CN CN2011200164145U patent/CN201974383U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2509716A (en) * | 2013-01-09 | 2014-07-16 | Internat Moisture Analysers Ltd | Optical chemical analyser and liquid depth sensor |
| GB2509716B (en) * | 2013-01-09 | 2018-07-04 | International Moisture Analysers Ltd | Spatial Interference Fourier Transform Raman chemical analyser |
| US10041880B2 (en) | 2013-01-09 | 2018-08-07 | International Moisture Analysers Limited | Optical chemical analyser and liquid depth sensor |
| US10508989B2 (en) | 2013-01-09 | 2019-12-17 | International Moisture Analysers Limited | Optical chemical analyser and liquid depth sensor |
| CN104251847A (en) * | 2013-06-28 | 2014-12-31 | 天津奇谱光电技术有限公司 | Fluorescence method optical fiber sensing system |
| CN107923599A (en) * | 2015-08-24 | 2018-04-17 | 亮锐控股有限公司 | Lighting apparatus for headlight for vehicle |
| US10551019B2 (en) | 2015-08-24 | 2020-02-04 | Lumileds Holding B.V. | Illumination device for a vehicle headlight |
| CN107923599B (en) * | 2015-08-24 | 2021-03-12 | 亮锐有限责任公司 | Lighting device for a vehicle headlight |
| CN112697762A (en) * | 2021-01-07 | 2021-04-23 | 中山复旦联合创新中心 | High-precision dissolved oxygen meter system and special SoC |
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