WO2021131616A1 - 尿素濃度センサおよびアンモニア濃度センサ - Google Patents

尿素濃度センサおよびアンモニア濃度センサ Download PDF

Info

Publication number
WO2021131616A1
WO2021131616A1 PCT/JP2020/045263 JP2020045263W WO2021131616A1 WO 2021131616 A1 WO2021131616 A1 WO 2021131616A1 JP 2020045263 W JP2020045263 W JP 2020045263W WO 2021131616 A1 WO2021131616 A1 WO 2021131616A1
Authority
WO
WIPO (PCT)
Prior art keywords
urea
light
concentration
concentration sensor
urea water
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.)
Ceased
Application number
PCT/JP2020/045263
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
森本　進
大地 前野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kubota Corp
Original Assignee
Kubota Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kubota Corp filed Critical Kubota Corp
Priority to US17/785,361 priority Critical patent/US20220381685A1/en
Priority to JP2021567157A priority patent/JPWO2021131616A1/ja
Priority to EP20904535.0A priority patent/EP4083609A4/en
Publication of WO2021131616A1 publication Critical patent/WO2021131616A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

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
    • G01N21/17—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
    • G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
    • 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
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/85—Investigating moving fluids or granular solids
    • G01N21/8507—Probe photometers, i.e. with optical measuring part dipped into fluid sample
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
    • G01N33/0054—Ammonia
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/148—Arrangement of sensors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
    • F01N2900/1806—Properties of reducing agent or dosing system
    • F01N2900/1818—Concentration of the reducing agent
    • 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
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/85—Investigating moving fluids or granular solids
    • G01N21/8507—Probe photometers, i.e. with optical measuring part dipped into fluid sample
    • G01N2021/8528—Immerged light conductor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/08—Optical fibres; light guides
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/12—Circuits of general importance; Signal processing
    • G01N2201/121—Correction signals
    • G01N2201/1211—Correction signals for temperature
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/12—Circuits of general importance; Signal processing
    • G01N2201/129—Using chemometrical methods
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a urea concentration sensor and an ammonia concentration sensor.
  • Patent Document 1 includes a selective reduction catalyst having a property of selectively reacting NOx (nitrogen oxide) with a reducing agent in the middle of an exhaust pipe through which exhaust gas flows in a diesel engine even in the presence of oxygen. Is disclosed. Further, urea water acting as a required amount of reducing agent is added to the upstream side of the selective reduction catalyst to cause the urea water to undergo a reduction reaction with NOx in the exhaust gas on the selective reduction catalyst, whereby the NOx emission concentration is increased. Is disclosed so as to be able to reduce.
  • NOx nitrogen oxide
  • Urea water is stored in the urea water tank mounted on the vehicle.
  • toxic ammonia and CO vaporized gas are generated by the gradual decomposition of urea in the urea water. Therefore, these vaporized gases increase in concentration in the tank as the operating period of the vehicle becomes longer. Therefore, in the invention according to Patent Document 1, the concentration of urea water is measured, and the vaporized gas generated in the tank is discharged to the outside of the tank as needed.
  • Patent Document 2 as a technique for measuring the concentration of urea water, the output value corresponding to the thermal conductivity of the liquid to be measured is measured and the output value corresponding to the kinematic viscosity is measured to correspond to the output value corresponding to the thermal conductivity and the kinematic viscosity.
  • a method of measuring the thermal conductivity formula for measuring the concentration of urea water from the calibration curve data showing the relationship between the output values is disclosed.
  • One aspect of the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a urea concentration sensor or the like capable of accurately measuring the concentration of urea water.
  • the urea concentration sensor uses a light source that emits measurement light including near-infrared light to a measurement target and transmitted light or reflected light from the measurement target. It includes a light receiving unit that receives light, and an analysis unit that analyzes the concentration of urea contained in the measurement target based on the spectrum of light received by the light receiving unit.
  • the urea concentration sensor irradiates the measurement target with the measurement light, and the analysis unit analyzes the urea concentration based on the transmitted light or the reflected light received by the light receiving unit. Therefore, the urea concentration sensor can reduce the influence of heat diffusion caused by the movement of the measurement target due to vibration, so that the concentration of urea contained in the measurement target can be measured accurately.
  • the wavelength of the measurement light is preferably less than 1100 nm.
  • the urea concentration sensor irradiates the measurement target with measurement light having a wavelength of less than 1100 nm, and the analysis unit analyzes the urea concentration based on the transmitted light or reflected light received by the light receiving unit.
  • Light having a wavelength of less than 1100 nm is less absorbed by water than light having a wavelength of 1100 nm or more. Therefore, by using light having a wavelength of less than 1100 nm as the measurement light, it is possible to measure the measurement target in a wider range when the measurement target includes water.
  • the light receiving unit receives the transmitted light transmitted through the measurement target by a predetermined distance.
  • the absorbance and the concentration of urea contained in the measurement target are in a proportional relationship, so that the concentration of urea water can be analyzed in a stable manner.
  • the predetermined distance is preferably 5 mm or more and 50 mm or less.
  • the urea concentration sensor according to one aspect of the present invention further includes a transmission path for transmitting light between the light source and the light receiving portion.
  • the light path between the light source and the light receiving portion can be arbitrarily designed.
  • the transmission line guides the light emitted by the light source to the measurement target and the light transmitted through the measurement target to the light receiving portion. It is preferable to include a second optical fiber.
  • a container and a lid for storing the measurement target are further provided, and only the transmission line is fixed in the container.
  • the urea concentration sensor it is preferable that at least one of the light source, the light receiving unit and the analysis unit is fixed to the lid.
  • the urea concentration sensor of the present invention at least one of the light source, the light receiving unit and the analysis unit can be fixed at a position higher than the measurement target without using other members. Therefore, even if the measurement target leaks from the container, the possibility that the urea concentration sensor is deteriorated by the leaked measurement target can be reduced.
  • the urea concentration sensor further includes a temperature sensor for measuring the temperature of the measurement target, and the analysis unit is based on the spectrum corrected based on the temperature measured by the temperature sensor. It is preferable to analyze the concentration of the urea.
  • the analysis unit further analyzes the concentration of ammonia contained in the measurement target based on the spectrum.
  • the concentration of ammonia produced by hydrolysis of urea water can be taken into consideration, so that the concentration of urea water can be analyzed more appropriately.
  • the ammonia concentration sensor includes a light source that emits measurement light including near-infrared light to a measurement target, a light receiving unit that receives transmitted light or reflected light from the measurement target, and the above.
  • the light receiving unit includes an analysis unit that analyzes the concentration of ammonia contained in the measurement target based on the spectrum of the light received by the light receiving unit.
  • a urea concentration sensor or the like that can accurately measure the concentration of urea water.
  • FIG. It is a figure which shows the outline of the exhaust gas purification system including the urea concentration sensor which concerns on Embodiment 1.
  • FIG. It is a figure which shows the outline of the urea concentration sensor which concerns on Embodiment 1.
  • FIG. It is a block diagram which shows the structure of the main part of the urea concentration sensor which concerns on Embodiment 1.
  • FIG. It is a graph which shows an example of the absorption spectrum of urea water and ammonia water. It is a graph which shows the calibration curve which shows the relationship between the absorbance and the concentration of ammonia in urea water. It is a graph which shows the calibration curve which shows the relationship between the absorbance and the concentration of urea in urea water.
  • FIG. 1 is a diagram showing an outline of an exhaust gas purification system 100 including a urea concentration sensor 1 according to the first embodiment.
  • the exhaust gas purification system 100 includes an engine 101, a cooling valve 102, a urea water tank 90 (container) and a lid 91 included in the urea concentration sensor 1, a urea water pump 103, and a urea water injector. 104 and.
  • the engine 101 is a prime mover that burns fuel such as gasoline in an engine such as a cylinder and obtains power by using the combustion gas generated thereby.
  • the combustion gas is discharged as exhaust gas after the engine 101 is powered.
  • the engine 101 is, for example, a diesel engine. Therefore, the exhaust gas includes NOx and the like.
  • the exhaust gas purification system 100 reduces the exhaust gas using urea water as a reducing agent.
  • the cooling valve 102 is a device that controls the direction, pressure, or flow rate of the fluid flow.
  • the cooling valve 102 is a device for cooling the exhaust gas burned by the engine 101.
  • the urea water tank 90 is a container for storing urea water used as a reducing agent.
  • the urea water tank 90 has a tubular shape with one end open.
  • the urea water tank 90 is not limited to this as long as it has a configuration capable of storing urea water.
  • the lid 91 closes one end side of the urea water tank 90. As a result, the possibility that the urea water stored in the urea water tank 90 leaks to the outside of the urea water tank 90 can be reduced.
  • the urea water pump 103 is a device that pumps up the urea water stored inside the urea water tank 90 and sends it to the urea water injector 104.
  • the urea water injector 104 is a device that injects urea water pumped up from the urea water tank 90 by the urea water pump 103 toward the exhaust gas from the engine 101.
  • the urea water stored in the urea water tank 90 is pumped up by the urea water pump 103 and sent to the urea water injector 104. Further, the urea water is injected from the urea water injector 104 toward the exhaust gas cooled by the cooling valve 102. Part of the urea water is hydrolyzed to ammonia, which reduces NOx. As a result, the concentration of NOx in the exhaust gas can be reduced. Further, a part of the urea water injected by the urea water injector 104 is stored again in the urea water tank 90. As a result, urea water can be effectively used.
  • FIG. 2 is a diagram showing an outline of the urea concentration sensor 1.
  • the urea concentration sensor 1 is a sensor that measures the concentration of urea in the urea water in the urea water tank 90. As shown in FIG. 2, the urea concentration sensor 1 includes a light source 10, a light receiving unit 20, an analysis unit 30, and a transmission line 40.
  • the light source 10 emits measurement light including near infrared light to the measurement target.
  • the measurement target is urea water in the urea water tank 90.
  • the measurement target may further contain ammonia or a reducing agent containing urea.
  • the measurement light is a laser light or a light having a single or wide band wavelength such as an LED (light Emitting Diode).
  • the wavelength of the measurement light is less than 1100 nm. Since light having a wavelength of less than 1100 nm is absorbed by water less than light having a wavelength of 1100 nm or more, it is possible to increase a predetermined distance through which transmitted light, which will be described later, passes through a measurement target. By increasing the distance through which the transmitted light is transmitted and measuring the urea water in a wider range, the influence of impurities and the like can be reduced, and the urea concentration can be measured accurately.
  • the wavelength of the measurement light is more preferably less than 1000 nm.
  • the concentration of urea contained in the measurement target can be measured more accurately than when the wavelength of the measurement light is 1000 nm or more and less than 1100 nm.
  • the wavelength of the measurement light is preferably larger than 500 nm, more preferably larger than 700 nm.
  • the light receiving unit 20 receives the transmitted light transmitted through the measurement target by a predetermined distance. Since the intensity of the measured light is known, the absorbance can be calculated based on the intensity of the light received by the light receiving unit and Lambert-Beer's law. Since the absorbance is proportional to the concentration of urea or ammonia contained in the urea water, the concentration of urea or ammonia can be analyzed based on the absorbance.
  • the predetermined distance is preferably 5 mm or more and 50 mm or less, and more preferably 10 mm or more and 30 mm or less. By setting a predetermined distance as the above distance, the concentration of urea or ammonia can be analyzed more stably.
  • the light receiving unit 20 is not limited to the one that receives the transmitted light, and may be configured to receive the reflected light reflected by the measurement target or the reflected light via the reflector. That is, the light receiving unit 20 may receive the transmitted light or the reflected light from the urea water.
  • the analysis unit 30 analyzes the concentrations of urea and ammonia contained in the urea water based on the spectrum of the light received by the light receiving unit 20. The specific configuration of the analysis unit 30 will be described later.
  • the transmission line 40 is a light guide member that transmits light between the light source 10 and the light receiving unit 20. Thereby, in the urea concentration sensor 1, the light path between the light source 10 and the light receiving unit 20 can be arbitrarily designed.
  • the transmission line 40 includes a first optical fiber 41 that guides the light emitted by the light source 10 to the measurement target, and a second optical fiber 42 that guides the light transmitted through the measurement target to the light receiving unit 20. ..
  • One end (first incident end) of the first optical fiber 41 is arranged at a position where the light from the light source 10 is incident.
  • One end (second emission end) of the second optical fiber 42 is arranged at a position where light is emitted toward the light receiving portion 20.
  • the other end of the first optical fiber 41 (first exit end) and the other end of the second optical fiber 42 (second incident end) are separated from each other in the urea water tank 90 by a predetermined distance in urea water. It is fixed so as to face each other.
  • the transmitted light which is the measurement light emitted from the first exit end and transmitted through the urea water by a predetermined distance, is incident on the second incident end.
  • the transmission line 40 is not limited to this as long as it transmits light between the light source 10 and the light receiving unit 20.
  • the transmission line 40 may include an optical member that guides light while internally reflecting the light emitted by the light source 10.
  • the light receiving unit 20 receives the transmitted light transmitted through the urea water for a predetermined distance. That is, the urea concentration sensor 1 measures the urea concentration by a so-called transmission method in which the measurement light is irradiated from one side of the urea water and the light transmitted through the urea water by a predetermined distance is detected from the other side. ..
  • the urea concentration sensor 1 can be measured by the interaction method instead of the transmission method by arranging the first optical fiber 41 and the second optical fiber 42.
  • the interaction method is a method of detecting the light diffused or reflected inside the measurement target by the measurement light.
  • the light source 10 In the example shown in FIG. 1, of the light source 10, the light receiving unit 20, the analysis unit 30, the first optical fiber 41 and the second optical fiber 42, only the first optical fiber 41 and the second optical fiber 42 are urea. It is fixed in the water tank 90.
  • the light source 10, the light receiving unit 20, and the analysis unit 30 are arranged outside the urea water tank 90.
  • the light source 10, the light receiving unit 20, and the analysis unit 30 may be arranged in a device other than the urea water tank 90 such as a vehicle body or a fuel tank.
  • the possibility that the light source 10, the light receiving unit 20, and the analysis unit 30 are deteriorated by the urea contained in the urea water stored in the urea water tank 90 or the ammonia produced by hydrolyzing the urea is reduced. Will be done.
  • the light source 10, the light receiving unit 20, and the analysis unit 30 included in the urea concentration sensor 1 are fixed to the lid 91.
  • the light source 10, the light receiving unit 20, and the analysis unit 30 can be fixed at a position higher than the liquid level of the urea water in the urea water tank 90 without using another member. Therefore, even when the urea water leaks from the urea water tank 90, the possibility that the urea water adheres to the light source 10, the light receiving unit 20, and the analysis unit 30 and deteriorates can be reduced.
  • the urea concentration sensor 1 it is not always necessary that the light source 10, the light receiving unit 20, and the analysis unit 30 are all fixed to the lid 91. If at least one of the light source 10, the light receiving unit 20, and the analysis unit 30 is fixed to the lid 91, the possibility that urea water adheres to the member and deteriorates can be reduced.
  • the urea concentration sensor 1 does not necessarily have to be attached to the lid 91, and may be attached to the outer wall of the urea water tank 90, the flow path of urea water pumped up by the urea water pump 103, or the like. In these cases, the urea concentration sensor 1 does not necessarily have to include the transmission line 40. When the transmission line 40 is not provided, the urea concentration sensor 1 can measure the urea concentration by the above-mentioned interaction method, for example, by providing a light source and a light receiving unit on the wall surface of the urea water tank 90 or the flow path of the urea water.
  • FIG. 3 is a block diagram showing a configuration of a main part of the urea concentration sensor 1.
  • the urea concentration sensor 1 further includes a display unit 50 and a storage unit 60.
  • the analysis unit 30 includes a light acquisition unit 31, a urea concentration analysis processing unit 32, an ammonia concentration analysis processing unit 33, and an output processing unit 34.
  • the light acquisition unit 31 receives a signal representing the spectrum of the transmitted light received by the light receiving unit 20.
  • the light acquisition unit 31 transmits a signal representing the spectrum of transmitted light to the ammonia concentration analysis processing unit 33 and the urea concentration analysis processing unit 32.
  • the spectrum of the transmitted light received by the light receiving unit 20 has information on the absorbance at wavelengths corresponding to both urea and ammonia, so that it is performed once. Measurement is fine.
  • the urea concentration and the ammonia concentration are measured at staggered time intervals, the urea concentration and the ammonia concentration are measured without adding the first optical fiber 41 and the second optical fiber 42, respectively.
  • the spectrum of transmitted light can be measured by changing only the wavelength of the light source suitable for measurement.
  • the urea concentration analysis processing unit 32 analyzes the concentration of urea contained in urea water based on a signal representing a spectrum of transmitted light. Specifically, the urea concentration analysis processing unit 32 calculates the absorbance at a predetermined wavelength (for example, 770 nm) from the spectrum of transmitted light. Further, the urea concentration analysis processing unit 32 analyzes the concentration of urea contained in the urea water based on the absorbance and the calibration curve data showing the relationship between the absorbance stored in the storage unit 60 and the concentration of urea. To do. However, the urea concentration analysis processing unit 32 is not limited to this as long as it has a configuration for analyzing the concentration of urea contained in urea water based on a signal representing a spectrum of transmitted light. The urea concentration analysis processing unit 32 transmits a signal representing the analyzed urea concentration to the output processing unit 34.
  • a predetermined wavelength for example, 770 nm
  • the ammonia concentration analysis processing unit 33 analyzes the concentration of ammonia contained in urea water based on the signal representing the spectrum of transmitted light. Specifically, the ammonia concentration analysis processing unit 33 calculates the absorbance at a predetermined wavelength (for example, 790 nm) from the spectrum of transmitted light. Further, the ammonia concentration analysis processing unit 33 analyzes the concentration of ammonia contained in the urea water based on the absorbance and the calibration curve data showing the relationship between the absorbance stored in the storage unit 60 and the concentration of ammonia. To do. However, the ammonia concentration analysis processing unit 33 is not limited to this as long as it has a configuration for analyzing the concentration of ammonia contained in urea water based on a signal representing a light spectrum. The ammonia concentration analysis processing unit 33 transmits a signal representing the analyzed ammonia concentration to the output processing unit 34.
  • a predetermined wavelength for example, 790 nm
  • the output processing unit 34 receives a signal indicating the urea concentration from the urea concentration analysis processing unit 32. Further, the output processing unit 34 receives a signal indicating the concentration of ammonia from the ammonia concentration analysis processing unit 33. The output processing unit 34 outputs a signal indicating the concentrations of urea and ammonia to the display unit 50.
  • the output processing unit 34 may output a signal indicating the concentrations of urea and ammonia to another external device.
  • the output processing unit 34 outputs the above signal to the urea water injector 104.
  • the urea water injector 104 adjusts the injection amount of urea water with respect to the exhaust gas based on the signal.
  • the display unit 50 displays an image showing the concentrations of urea and ammonia input from the output processing unit 34.
  • the display unit 50 is, for example, a liquid crystal display.
  • the urea concentration sensor 1 does not necessarily have to include the display unit 50, and may include a light emitting element that turns on or off depending on whether or not the urea concentration is within a predetermined range.
  • the urea concentration sensor 1 may include an audio output unit that outputs audio depending on whether or not the urea concentration is within a predetermined range.
  • the urea concentration sensor 1 may be configured to be communicable with an external display unit, a light emitting element, or an audio output unit.
  • the storage unit 60 is a storage device that stores information necessary for processing by the analysis unit 30.
  • the storage unit 60 stores data on the absorbance corresponding to the wavelengths of urea water and ammonia.
  • the storage unit 60 stores calibration curve data showing the relationship between the concentration of urea and the absorbance at a specific wavelength (for example, 770 nm).
  • the storage unit 60 stores calibration curve data showing the relationship between the concentration and absorbance of ammonia at a specific wavelength (for example, 790 nm).
  • the urea concentration sensor 1 does not necessarily have to include the storage unit 60, and may be configured to be able to communicate with a storage device provided externally.
  • FIG. 4 is a graph showing an example of absorption spectra of urea water and ammonia water.
  • the horizontal axis represents the wavelength of transmitted light from urea water and ammonia water
  • the vertical axis represents the second derivative of the absorbance of urea water and ammonia water.
  • the second-order absorbance differential value is a value corresponding to the absorbance, and is a value for measuring the absorbance more accurately.
  • the absorption spectrum of urea water has a strong negative peak at a wavelength near 770 nm, which is indicated by reference numeral 770.
  • the absorption spectrum of aqueous ammonia has a strong negative peak at a wavelength near 790 nm, which is indicated by reference numeral 790.
  • the urea concentration analysis processing unit 32 analyzes the urea concentration of the urea water by using the peak of the absorbance at the position where the wavelength is 770 nm and the calibration curve data described later.
  • the ammonia concentration analysis processing unit 33 analyzes the ammonia concentration by using the peak of the absorbance at the position where the wavelength is 790 nm and the calibration curve data described later.
  • FIG. 5 is a graph showing a calibration curve showing the relationship between the absorbance and the concentration of ammonia in urea water.
  • the horizontal axis represents the absorbance of ammonia and the vertical axis represents the concentration of ammonia.
  • the calibration curve data shown in FIG. 5 is data for light having a wavelength in the vicinity of 790 nm.
  • the concentration of ammonia is proportional to the absorbance of ammonia.
  • the ammonia concentration analysis processing unit 33 contains the ammonia water in urea water based on the absorbance of light having a wavelength near 790 nm calculated based on the signal representing the absorption spectrum of ammonia water and the calibration curve data shown in FIG. Analyze the concentration of ammonia.
  • FIG. 6 is a graph showing a calibration curve showing the relationship between the absorbance and the concentration of urea in urea water.
  • the horizontal axis represents the absorbance of urea and the vertical axis represents the concentration of urea.
  • the calibration curve data shown in FIG. 6 is data for light having a wavelength in the vicinity of 770 nm.
  • the concentration of urea is proportional to the absorbance of urea.
  • the urea concentration analysis processing unit 32 calculates the concentration of urea contained in the urea water based on the absorbance of light having a wavelength of 770 nm calculated based on the absorption spectrum of the urea water and the calibration curve data shown in FIG. Can be analyzed.
  • the absorption spectra of urea water and ammonia water have peaks corresponding to the respective concentrations of urea and ammonia in addition to the peaks indicated by reference numerals 770 and 790 in FIG.
  • the urea concentration analysis processing unit 32 and the ammonia concentration analysis processing unit 33 calculate the absorbances at a plurality of wavelengths at which the peaks appear as to which peak is used to analyze the concentrations of urea and ammonia, and the absorbances thereof are multivariate. It may be determined by performing an analysis.
  • the storage unit 60 may store calibration curve data showing the relationship between the absorbance at a wavelength that may be used to analyze the concentrations of urea and ammonia and the concentrations of urea and ammonia. ..
  • the analysis unit 30 does not necessarily have to include the ammonia concentration analysis processing unit 33. If the analysis unit 30 includes at least the urea concentration analysis processing unit 32, the analysis unit 30 can detect the concentration of urea contained in the urea water.
  • the analysis unit 30 includes an ammonia concentration analysis processing unit 33. That is, it is preferable that the analysis unit 30 analyzes the concentration of ammonia contained in the urea water based on the spectrum of transmitted light. A part of urea contained in urea water may be changed to ammonia in a state of being stored in the urea water tank 90. In this case, the concentration of urea obtained as a result of the analysis by the urea concentration analysis processing unit 32 is apparently small. Therefore, when the urea water injector 104 has a function of determining the injection amount of urea water based on the concentration of urea, it is conceivable to inject an excessive amount of urea water based on the result of the above analysis.
  • the urea water injector 104 can determine the amount of urea water to be injected in consideration of the amount of ammonia contained in the urea water. Therefore, the possibility of injecting an excessive amount of urea water is reduced. In other words, the amount of urea water added to NOx in the exhaust gas purification system 100 can be appropriately controlled.
  • FIG. 7 is a block diagram showing a configuration of a main part of the urea concentration sensor 2 according to the second embodiment. As shown in FIG. 7, the urea concentration sensor 2 is different from the urea concentration sensor 1 in that the temperature sensor 70 is further provided and the analysis unit 80 is provided instead of the analysis unit 30.
  • the temperature sensor 70 is a sensor that measures the temperature of urea water. Further, the temperature sensor 70 may measure the temperature of the outside air.
  • the analysis unit 80 further includes a temperature acquisition unit 81 and a correction processing unit 82 in addition to the configuration of the analysis unit 30. In the analysis unit 80, the light acquisition unit 31 transmits a signal representing the spectrum of the light received by the light receiving unit 20 to the correction processing unit 82.
  • the temperature acquisition unit 81 acquires a signal indicating the temperature of the urea water from the temperature sensor 70 and outputs the signal to the correction processing unit 82.
  • the correction processing unit 82 is a signal representing the spectrum of light based on a signal representing the spectrum of light, a signal indicating the temperature of urea water, and correction data which is data for correcting the spectrum based on the temperature. To correct.
  • the correction data is stored in the storage unit 60 in advance.
  • the correction processing unit 82 transmits a signal representing the spectrum of the transmitted light after correction to the urea concentration analysis processing unit 32 and the ammonia concentration analysis processing unit 33.
  • the urea concentration analysis processing unit 32 and the ammonia concentration analysis processing unit 33 respectively, determine the urea and ammonia contained in the urea water based on the signals representing the spectrum of the transmitted light corrected by the correction processing unit 82. Analyze the concentration.
  • the urea concentration sensor 2 does not have to include the temperature sensor 70.
  • the correction processing unit 82 determines the spectrum of light based on, for example, a signal representing a spectrum of light and a signal representing a spectrum of light based on correction data, which is data for correcting the spectrum based on temperature.
  • the signal representing the above may be corrected.
  • the analysis unit 80 analyzes the concentration of urea contained in the urea water based on the spectrum of transmitted light corrected based on the temperature measured by the temperature sensor 70. Thereby, even when the temperature of the urea water changes, the concentration of urea contained in the urea water can be appropriately analyzed.
  • the correction processing unit 82 may correct the spectrum by using the temperature of the outside air. Further, the correction processing unit 82 sets a load factor (weighting coefficient) based on the temperature difference between the outside air temperature and the urea water, and corrects the load factor (weighting coefficient) based on the weighting actual data obtained by multiplying the past actual data by the load factor (weighting coefficient). You may. In this case, the load factor due to the temperature difference between the outside air temperature and the urea water, and the past actual data are stored in the storage unit 60 in advance. The storage unit 60 and the machine learning device may be configured to be communicable.
  • the correction processing unit 82 can determine the correction data using the data processed by the machine learning device as to which actual data is appropriate to be multiplied by the load factor.
  • the machine learning device inputs, for example, a product-sum calculation value of the concentration and temperature of urea water over a predetermined period in the past, and the temperature of the outside air and the load factor due to the temperature difference of the urea water, and outputs spectrum correction data. It is configured in.
  • Algorithms used in machine learning devices include one-class support vector machine (One-Class Support Vector Machine), LOF (local outlier factor) method, and IF (Isolation Forest) method that predict the occurrence of abnormalities due to a specific combination.
  • LOF local outlier factor
  • IF Isolation Forest
  • RC Local Covariance
  • the urea concentration sensors 1 and 2 measured at least the concentration of urea.
  • the urea concentration sensors 1 and 2 do not necessarily have to measure the urea concentration, and may measure only the ammonia concentration, for example. That is, the urea concentration sensors 1 and 2 in each of the above-described embodiments can also be used as an ammonia concentration sensor for measuring the concentration of ammonia contained in a measurement target such as urea water.
  • the ammonia concentration sensor is received by the light source 10 that emits measurement light including near-infrared light to the measurement target, the light receiving unit 20 that receives the transmitted light or reflected light from the measurement target, and the light receiving unit 20. It includes an analysis unit 30 that analyzes the concentration of ammonia contained in the measurement target based on the spectrum of light. According to such an ammonia concentration sensor, the concentration of ammonia contained in the measurement target can be measured accurately.
  • FIG. 8 is a diagram showing an outline of an exhaust gas purification system 100A including the urea concentration sensors 3 and 4 according to the fourth embodiment.
  • the exhaust gas purification system 100A includes one or both of the urea concentration sensors 3 and 4 instead of the urea concentration sensor 1.
  • the urea concentration sensor 3 is arranged on the bottom side surface of the urea water tank 90. Further, the urea concentration sensor 4 is provided in the tube 92.
  • the pipe 92 is a pipe through which urea water flows from the urea water tank 90 to the urea water pump 103.
  • the urea concentration sensor 4 may be provided near the end of the tube 92 on the urea water tank 90 side. That is, the urea concentration sensor 4 may be arranged on the upper part of the lid 91. Further, the urea concentration sensor 4 may be arranged near the end of the pipe 92 on the urea water pump 103 side.
  • FIG. 9 is a diagram showing the configuration of the urea concentration sensor 3.
  • Reference numeral 9001 in FIG. 9 is a perspective view showing an arrangement state of the urea concentration sensor 3.
  • Reference numeral 9002 in FIG. 9 is a plan view of the urea concentration sensor 3.
  • Reference numeral 9003 in FIG. 9 is a front view of the urea concentration sensor 3.
  • the urea concentration sensor 3 includes a light source 10, a light receiving unit 20, an analysis unit 30, a power supply 110, a communication unit 111, and an accommodating unit 112.
  • the light source 10 is as described above. Specific examples of the light source 10 include, but are not limited to, wideband LEDs.
  • the power supply 110 is a device that supplies electric power to the urea concentration sensors 3 and 4.
  • the communication unit 111 is a communication device for communicating with an external device.
  • the communication unit 111 has an I / F (Interface) for CAN (Controller Area Network) communication.
  • the urea concentration sensor 1 in the first embodiment also has a power supply and a communication unit, but the illustration is omitted.
  • the accommodating unit 112 is a portion in which the urea water is accommodated in order for the analysis unit 30 to analyze the concentration of urea contained in the urea water.
  • the accommodating portion 112 is a rectangular parallelepiped container having an opening formed on the side facing the urea water tank 90 so that the urea water stored in the urea water tank 90 can flow into the container. is there.
  • the accommodating portion 112 is made of a material that transmits light emitted from the light source 10.
  • the light source 10 is provided at a position where light is incident on one side surface of the accommodating portion 112.
  • the light receiving unit 20 is provided at a position of receiving light emitted from a side surface of the accommodating unit 112 facing the side surface on which the light source 10 is provided.
  • the arrangement mode of the light source 10 and the light receiving unit 20 is not limited to this as long as the function of the light receiving unit 20 can be exerted from the outside of the accommodating unit 112.
  • FIG. 10 is a diagram showing the configuration of the urea concentration sensor 4.
  • Reference numeral 1011 in FIG. 10 is a diagram showing an arrangement state of the urea concentration sensor 4.
  • Reference numeral 1012 in FIG. 10 is a plan view of the urea concentration sensor 4.
  • Reference numeral 1013 in FIG. 10 is a front view of the urea concentration sensor 4.
  • the urea concentration sensor 4 includes a light source 10, a light receiving unit 20, an analysis unit 30, a power supply 110, a communication unit 111, and an accommodating unit 112.
  • the accommodating portion 112 is provided in the middle of the tube 92.
  • the urea water flowing through the pipe 92 passes through the accommodating portion 112.
  • the light source 10 and the light receiving unit 20 are arranged so as to face each other with the accommodating unit 112 interposed therebetween.
  • the arrangement mode of the light source 10 and the light receiving unit 20 is not limited to this as long as the function of the light receiving unit 20 can be exerted from the outside of the accommodating unit 112.
  • urea concentration sensors 3 and 4 In the urea concentration sensors 3 and 4, a light source 10 and a light receiving unit 20 are provided outside the accommodating unit 112.
  • the analysis unit 30 can analyze the concentrations of urea and ammonia contained in the urea water based on the spectrum of the light received by the light receiving unit 20. Further, as compared with the urea concentration sensor 1 in the first embodiment, the urea concentration sensors 3 and 4 do not include the optical fibers 41 and 42, and the analysis unit 30 analyzes the concentrations of urea and ammonia contained in the urea water. Therefore, the number of parts can be reduced.
  • the exhaust gas purification system 100A may be provided with only one of the urea concentration sensors 3 and 4, or may be provided with two or more. Further, the exhaust gas purification system 100A may include another urea concentration sensor 4 in addition to the two urea concentration sensors 4. In this case, the other urea concentration sensor 4 is arranged at an intermediate point between the urea water tank 90 and the urea water pump 103, for example, in the pipe 92.
  • the exhaust gas purification system 100A includes two or more of the urea concentration sensors 3 and 4, and the urea concentrations contained in the urea water analyzed by the analysis unit 30 included in the urea concentration sensors 3 and 4 are different from each other. The average value of these values may be the concentration of urea contained in the urea water.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Combustion & Propulsion (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
PCT/JP2020/045263 2019-12-24 2020-12-04 尿素濃度センサおよびアンモニア濃度センサ Ceased WO2021131616A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US17/785,361 US20220381685A1 (en) 2019-12-24 2020-12-04 Urea concentration sensor and ammonia concentration sensor
JP2021567157A JPWO2021131616A1 (https=) 2019-12-24 2020-12-04
EP20904535.0A EP4083609A4 (en) 2019-12-24 2020-12-04 UREA CONCENTRATION SENSOR AND AMMONIA CONCENTRATION SENSOR

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-233326 2019-12-24
JP2019233326 2019-12-24

Publications (1)

Publication Number Publication Date
WO2021131616A1 true WO2021131616A1 (ja) 2021-07-01

Family

ID=76573953

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/045263 Ceased WO2021131616A1 (ja) 2019-12-24 2020-12-04 尿素濃度センサおよびアンモニア濃度センサ

Country Status (4)

Country Link
US (1) US20220381685A1 (https=)
EP (1) EP4083609A4 (https=)
JP (1) JPWO2021131616A1 (https=)
WO (1) WO2021131616A1 (https=)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20230007784A (ko) * 2021-07-06 2023-01-13 현대자동차주식회사 분사수 공급장치
WO2025104291A1 (en) * 2023-11-17 2025-05-22 Casale Sa Use of nir spectroscopy in a urea process, and related method and plant

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01297519A (ja) * 1988-05-26 1989-11-30 Ricoh Co Ltd 液体温度計
JPH07198559A (ja) * 1993-12-28 1995-08-01 Nec Corp 薬液濃度測定方法およびその装置
JP2000097852A (ja) * 1998-09-21 2000-04-07 Horiba Ltd アンモニア測定装置
JP2005076575A (ja) 2003-09-02 2005-03-24 Hino Motors Ltd 排気浄化装置
JP2005257319A (ja) * 2004-03-09 2005-09-22 Mitsui Mining & Smelting Co Ltd 液性検知装置および液性検知方法
JP2008209405A (ja) 2007-01-30 2008-09-11 Mitsui Mining & Smelting Co Ltd アンモニア発生量の測定方法およびアンモニア発生量の測定装置
JP2008256663A (ja) * 2007-04-09 2008-10-23 Nippon Soken Inc 尿素濃度検出装置
JP2010002284A (ja) * 2008-06-20 2010-01-07 Sumitomo Electric Ind Ltd 赤外線検知式ガスセンサおよびそれを用いた排気ガス浄化装置
JP2010223650A (ja) * 2009-03-23 2010-10-07 Toyota Central R&D Labs Inc 排ガス成分の測定方法及び排ガス成分測定装置
JP2014516168A (ja) * 2011-06-07 2014-07-07 メジャメント スペシャリティーズ， インコーポレイテッド 流体検出のための光検出装置、およびそのための方法
WO2018215388A1 (en) * 2017-05-22 2018-11-29 Uab Brolis Semiconductors Tunable hybrid iii-v/ iv laser sensor system-on-a-chip for real-time monitoring of a blood constituent concentration level

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009216385A (ja) * 2006-05-19 2009-09-24 Toyota Motor Corp ガス分析装置及びガス分析装置におけるレーザの波長掃引制御方法
EP2543839A1 (fr) * 2011-07-04 2013-01-09 Inergy Automotive Systems Research (Société Anonyme) Dispositif de mesure de la concentration d'urée
US20150308952A1 (en) * 2014-04-23 2015-10-29 Littelfuse, Inc. Urea concentration sensor
US10746071B2 (en) * 2018-05-01 2020-08-18 Caterpillar Inc. Engine aftertreatment system

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01297519A (ja) * 1988-05-26 1989-11-30 Ricoh Co Ltd 液体温度計
JPH07198559A (ja) * 1993-12-28 1995-08-01 Nec Corp 薬液濃度測定方法およびその装置
JP2000097852A (ja) * 1998-09-21 2000-04-07 Horiba Ltd アンモニア測定装置
JP2005076575A (ja) 2003-09-02 2005-03-24 Hino Motors Ltd 排気浄化装置
JP2005257319A (ja) * 2004-03-09 2005-09-22 Mitsui Mining & Smelting Co Ltd 液性検知装置および液性検知方法
JP2008209405A (ja) 2007-01-30 2008-09-11 Mitsui Mining & Smelting Co Ltd アンモニア発生量の測定方法およびアンモニア発生量の測定装置
JP2008256663A (ja) * 2007-04-09 2008-10-23 Nippon Soken Inc 尿素濃度検出装置
JP2010002284A (ja) * 2008-06-20 2010-01-07 Sumitomo Electric Ind Ltd 赤外線検知式ガスセンサおよびそれを用いた排気ガス浄化装置
JP2010223650A (ja) * 2009-03-23 2010-10-07 Toyota Central R&D Labs Inc 排ガス成分の測定方法及び排ガス成分測定装置
JP2014516168A (ja) * 2011-06-07 2014-07-07 メジャメント スペシャリティーズ， インコーポレイテッド 流体検出のための光検出装置、およびそのための方法
WO2018215388A1 (en) * 2017-05-22 2018-11-29 Uab Brolis Semiconductors Tunable hybrid iii-v/ iv laser sensor system-on-a-chip for real-time monitoring of a blood constituent concentration level

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4083609A4

Also Published As

Publication number Publication date
US20220381685A1 (en) 2022-12-01
JPWO2021131616A1 (https=) 2021-07-01
EP4083609A4 (en) 2024-01-24
EP4083609A1 (en) 2022-11-02

Similar Documents

Publication Publication Date Title
EP1965194B1 (en) Method for analyzing exhaust gas and apparatus for analyzing exhaust gas
US9851295B2 (en) Optical devices for fluid sensing and methods therefor
US8825214B2 (en) Method of analyzing and controlling a combustion process in a gas turbine and apparatus for performing the method
KR101414923B1 (ko) 유량 측정 장치 및 유속 측정 장치
CN102022193B (zh) 用于闭环排放物控制的系统和方法
US9304079B2 (en) Gas analyser
JP6786099B2 (ja) 濃度測定装置
WO2009119790A1 (ja) 光分析計及び分析計用波長安定化レーザ装置
GB2478254A (en) Method and device for measuring the concentration of substances in gaseous or fluid media through optical spectroscopy using broadband light sources
WO2021131616A1 (ja) 尿素濃度センサおよびアンモニア濃度センサ
CN112304885A (zh) 一种基于vcsel的自适应多谱线co检测系统及方法
FI130319B (en) Method and apparatus for measuring a spectrum of a gaseous sample
US12078590B2 (en) Concentration measuring method, and concentration measuring device
JP2012137429A (ja) レーザ計測装置
Schmidt et al. Laser based measurement of water film thickness for the application in exhaust after-treatment processes
US8295657B2 (en) Optical fiber sensor and fuel supply apparatus having the same
CN213121592U (zh) 一种光谱水质探头和光谱水质检测装置
JP5221053B2 (ja) 尿素濃度検出装置
JP7323945B2 (ja) 濃度測定方法
Hawe et al. CO2 monitoring and detection using an integrating sphere as a multipass absorption cell
JP5188858B2 (ja) 光分析装置
CN106033051B (zh) 用于检测溶液浓度的装置
US10288561B1 (en) Gas analyzer
JP6277938B2 (ja) ガス分析装置
Schmidt et al. Diode laser based film thickness measurement of DEF

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20904535

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2021567157

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2020904535

Country of ref document: EP

Effective date: 20220725