CN107144538A - The detection method of the normal condition absorption coefficient of light and absorptivity - Google Patents
The detection method of the normal condition absorption coefficient of light and absorptivity Download PDFInfo
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- CN107144538A CN107144538A CN201710483699.5A CN201710483699A CN107144538A CN 107144538 A CN107144538 A CN 107144538A CN 201710483699 A CN201710483699 A CN 201710483699A CN 107144538 A CN107144538 A CN 107144538A
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- 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
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Abstract
The detection method of the normal condition absorption coefficient of light and absorptivity, is that the absorption coefficient of light k or absorptivity N detected under different EGT t, air pressure P is corrected in fiducial temperature t0, air pressure P0Lower absorption coefficient of light k0Or absorptivity N0A kind of method, if the solid volume V such as carbon particle in detection discharge exhaust gas volumemThe influence of not examined temperature and air pressure is the gas volume V in invariant, detection discharge exhaust gas volumeQMeet the equation of gas state in the different gentle pressures of temperature, the gas volume V under detection stateQIt is converted into the gas volume V under normal condition0, calculate δ=V0/VQ=P × (273+t0)/[(273+t)×P0], if B=Vm/VQ, B0=Vm/V0, by k/B=k0/B0, or by k × VQ=k0×V0, or set detection printing opacity column volume as V waste gas meet the equation of gas state, k can be obtained0=k/ δ or N0=N/ δ.
Description
Technical field
The detection method of the normal condition absorption coefficient of light and absorptivity, is in inspection diesel engine and dress diesel engine automobile
The absorption coefficient of light detected under ambient condition under different EGTs, air pressure or absorptivity amendment are surveyed in fiducial temperature, gas
The absorption coefficient of light of pressure or a kind of method of absorptivity, belong to car consumption credit method and technology field.
Background technology
The diesel vehicle absorption coefficient of light or absorptivity detection in, due to diesel automobile in use discharge EGT difference compared with
Greatly, the length of blast pipe also differs larger, and detection environment temperature and air pressure change are also larger, and In-Use Motor Vehicles surveys the temperature of waste gas
It is very big with air pressure change, and detect that waste gas absorption coefficient of light k or absorptivity N are influenceed very big by EGT and atmospheric pressure, are
Ensure N or k detection and evaluate uniformity, should detected under different EGTs, air pressure N or k amendment fiducial temperature,
Value under air pressure.Prior art is corrected using the method for test statistics, and it is disadvantageous in that：(1) experiment light absorbs system
Several scopes is larger.Experiment is very complicated, and operability is very poor.(2) influence and amendment of the air pressure to waste gas N or k are not accounted for.(3)
It is difficult that stable exhaust gas source is provided in substantial amounts of experiment, test error is larger.The normal condition absorption coefficient of light and absorptivity
Detection method, overcome the deficiencies in the prior art.
The content of the invention
Diesel emission waste gas is mainly the solids such as carbon particle and other waste exhaust gases, the absorption coefficient of light and absorptivity with
The solid volumes such as carbon particle are directly proportional, the solid volume such as charcoal particle VmCoefficient of expansion very little, the change of detection temperature and air pressure
To VmInfluence very little can be neglected, and waste exhaust gases volume VQLarger can not ignore of the coefficient of expansion disregard.Normal condition light
The detection method of absorption coefficient and absorptivity, if detecting the solid volume V such as the carbon particle in exhaust gas volumemIn different detections
The gentle pressure of temperature does not change, the gas volume V in detection exhaust gas volumeQMeet gaseous state in the different gentle pressures of temperature
Equation, the temperature t and air pressure P of measurement discharge waste gas on wasted nickel catalyst instrument, unit is respectively DEG C and kPa, due to measurement discharge
The distance that waste gas is communicated with air is very short, can simplify with detection ambient condition atmospheric pressure to replace P.If the waste gas of normal condition
Temperature is t0, unit DEG C, the waste gas air pressure of normal condition is P0, unit kPa, under detection state institute's light-metering absorption coefficient be k or
Absorptivity is N, and the normal condition absorption coefficient of light is k0Or absorptivity is N0。
By the equation of gas state, gas volume V in waste gas is calculated under detection stateQGas volume under normal condition is
V0, δ=V0/VQ=P × (273+t0)/[(273+t)×P0], P, t are detected value, P0、t0It is setting value, can calculates and obtain δ values,
V0=δ × VQ.Same discharge waste gas is equal under different temperatures and atmospheric pressure has changed VQ, so as to influence the absorption coefficient of light or light
The detected value of absorptivity, if it is B, B=V that the ratio between solid volume and gas volume in waste gas is discharged in detectionm/VQ, by detection k or N
It is directly proportional to B, k/B=k0/B0, B0=Vm/V0, k0=k × B0/ B=k × VQ/V0=k/ δ, similarly N0=N/ δ；Or by detection
K or N and VQIt is inversely proportional, k × VQ=k0×V0, k0=k × VQ/V0=k/ δ, similarly N0=N/ δ；Or setting detection printing opacity cylinder
Product meets the equation of gas state for V waste gas, exhaust gas volume of the exhaust gas volume V conversions under normal condition under detection state
Vb, δ=Vb/ V=P × (273+t0)/[(273+t)×P0], detection state solid volume concentration ρ=Vm/ V, normal condition solid
Volumetric concentration ρ0=Vm/Vb, the solid volume in detection volume V, which becomes, turns to Vmb, Vmb=V × ρ0=V × Vm/Vb=Vm/ δ, is pressed
Detection k or N is directly proportional to waste gas solid volume, k/Vm=k0/Vmb, k0=k × Vmb/Vm=k/ δ.
Such as the identical P=P of air pressure0And temperature is different, when t is more than t0When, δ is less than 1, detects state volume relative datum state
Volume increases, and the N or k of detection are less than normal, detected value divided by the δ less than 1, and amendment increases normal condition value.Such as the identical t=of temperature
t0And air pressure is different, when P is more than P0When, δ is more than 1, and detection state volume relative datum state volume reduces, and the N or k of detection are inclined
Greatly, detected value divided by the δ more than 1, amendment reduce normal condition value.
It can measure the average of EGT to set t by the detector of statistics0, or by the automobile exhaust pipe waste gas of statistics
Temperature average sets t0, or by ambient condition temperature average set t0, can using 100kPa as normal condition air pressure.
The detection method of the normal condition absorption coefficient of light and absorptivity, be different EGTs, air pressure is lower is detected
The absorption coefficient of light or absorptivity the amendment absorption coefficient of light or absorptivity under fiducial temperature, air pressure a kind of method, its
It is characterised by：If solid volume V such as the carbon particles in detection discharge exhaust gas volumemThe influence of not examined temperature and air pressure is not
Gas volume V in variable, detection discharge exhaust gas volumeQMeet the equation of gas state in the different gentle pressures of temperature, inspection
Gas volume V under survey stateQIt is converted into the gas volume V under normal condition0, calculate δ=V0/VQ=P × (273+t0)/
[(273+t)×P0], P0、t0Respectively the setting waste gas air pressure of normal condition, temperature, unit DEG C, P, t are respectively detection state
Under waste gas air pressure, temperature, unit DEG C, or set the atmospheric pressure that P is equal to detection ambient condition, institute's light-metering absorbs under detection state
Coefficient is k or absorptivity is that the absorption coefficient of light is k under N, normal condition0Or absorptivity is N0；If B=Vm/VQ, B0=
Vm/V0, by k/B=k0/B0, k can be obtained0=k/ δ or N0=N/ δ；Or by k × VQ=k0×V0, k can be obtained0=k/ δ or N0=
N/δ；Or set detection printing opacity column volume as V waste gas meet the equation of gas state, exhaust gas volume V under detection state is converted
Exhaust gas volume V under normal conditionb, δ=Vb/ V=P × (273+t0)/[(273+t)×P0], solid volume under detection state
Concentration ρ=VmSolid volume concentration ρ under/V, normal condition0=Vm/Vb, the solid volume in detection volume V, which becomes, turns to Vmb, Vmb
=V × ρ0=V × Vm/Vb=Vm/ δ, by k/Vm=k0/Vmb, k can be obtained0=k/ δ or N0=N/ δ.
Embodiment
Using two same model diesel automobile in use under same place, same detection ambient condition detect the absorption coefficients of light as
Example, come the embodiment of the detection method that illustrates the normal condition absorption coefficient of light and absorptivity.With environment mean temperature
20 DEG C, atmospheric pressure 100kPa be used as the temperature and air pressure of normal condition, if the limit value of the absorption coefficient of light is not more than 1.61.
1st, previous diesel vehicle measurement absorption coefficient of light k=1.46, measures t=66 DEG C of EGT, air pressure P=
102kPa, calculates δ=102 × (273+20)/[(273+66) × 100]=0.8816, k0=k/ δ=1.46/0.8816=
1.66.Absorption coefficient of light k=1.46 is not corrected qualified, normal condition absorption coefficient of light k after amendment0=1.66 is unqualified, two shapes
State detected value difference 13.7%.
2nd, latter diesel vehicle measurement absorption coefficient of light k=1.63, measures t=42 DEG C of EGT, air pressure P=
111kPa, calculates δ=111 × (273+20)/[(273+42) × 100]=1.033, k0=k/ δ=1.63/1.033=1.58.
Absorption coefficient of light k=1.63 is not corrected unqualified, normal condition absorption coefficient of light k after amendment0=1.58 is qualified, two state-detections
Value difference -3.1%.If do not corrected, latter diesel vehicle waste gas discharge is more than previous diesel vehicle, and unqualified, amendment
Afterwards then on the contrary, the actual waste gas discharge of latter diesel vehicle is less than previous diesel vehicle.Only detected value amendment in unification
Under normal condition, wasted nickel catalyst and evaluation are just meaningful.
The detection method of the normal condition absorption coefficient of light and absorptivity, all corrects the detected value of different vehicle in benchmark
Uniformly evaluate and compare under state, have the advantages that accuracy is good, simple, correct automatically.
Claims (1)
1. the detection method of the normal condition absorption coefficient of light and absorptivity, being detected under different EGTs, air pressure
A kind of method of the absorption coefficient of light or absorptivity the amendment absorption coefficient of light or absorptivity under fiducial temperature, air pressure, it is special
Levy and be：If solid volume V such as the carbon particles in detection discharge exhaust gas volumemThe influence of not examined temperature and air pressure is constant
Gas volume V in amount, detection discharge exhaust gas volumeQMeet the equation of gas state in the different gentle pressures of temperature, detection
Gas volume V under stateQIt is converted into the gas volume V under normal condition0, calculate δ=V0/VQ=P × (273+t0)/[(273+
t)×P0], P0、t0Respectively the setting waste gas air pressure of normal condition, temperature, unit DEG C, P, t are respectively useless under detection state
Gas air pressure, temperature, unit DEG C, or the atmospheric pressure that P is equal to detection ambient condition is set, institute's light-metering absorption coefficient is under detection state
K or absorptivity are that the absorption coefficient of light is k under N, normal condition0Or absorptivity is N0；If B=Vm/VQ, B0=Vm/V0, press
K/B=k0/B0, k can be obtained0=k/ δ or N0=N/ δ；Or by k × VQ=k0×V0, k can be obtained0=k/ δ or N0=N/ δ；Or
The waste gas that person sets detection printing opacity column volume as V meets the equation of gas state, exhaust gas volume V conversions under detection state in benchmark
Exhaust gas volume V under stateb, δ=Vb/ V=P × (273+t0)/[(273+t)×P0], solid volume concentration ρ under detection state
=VmSolid volume concentration ρ under/V, normal condition0=Vm/Vb, the solid volume in detection volume V, which becomes, turns to Vmb, Vmb=V ×
ρ0=V × Vm/Vb=Vm/ δ, by k/Vm=k0/Vmb, k can be obtained0=k/ δ or N0=N/ δ.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113260850A (en) * | 2019-01-31 | 2021-08-13 | 株式会社富士金 | Concentration measuring device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101183068A (en) * | 2007-12-21 | 2008-05-21 | 吴明 | Method for correcting basic state temperature absorption coefficient of light |
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2017
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101183068A (en) * | 2007-12-21 | 2008-05-21 | 吴明 | Method for correcting basic state temperature absorption coefficient of light |
Non-Patent Citations (2)
| Title |
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| 刘忠等: "《流体传动与控制技术》", 30 June 2016, 西安电子科技大学出版社 * |
| 吴明、张帮锋: "温度对光吸收系数的影响和修正方法", 《公路与汽运》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113260850A (en) * | 2019-01-31 | 2021-08-13 | 株式会社富士金 | Concentration measuring device |
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Application publication date: 20170908 |