CN204679412U - A kind of bias light compensation device for water quality monitoring - Google Patents
A kind of bias light compensation device for water quality monitoring Download PDFInfo
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- CN204679412U CN204679412U CN201520352680.3U CN201520352680U CN204679412U CN 204679412 U CN204679412 U CN 204679412U CN 201520352680 U CN201520352680 U CN 201520352680U CN 204679412 U CN204679412 U CN 204679412U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 238000012544 monitoring process Methods 0.000 title claims abstract description 43
- 238000007689 inspection Methods 0.000 claims abstract description 120
- 230000003287 optical effect Effects 0.000 claims abstract description 103
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 31
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 230000009897 systematic effect Effects 0.000 abstract description 4
- 238000002835 absorbance Methods 0.000 description 37
- 238000006243 chemical reaction Methods 0.000 description 17
- 238000012937 correction Methods 0.000 description 17
- 238000001514 detection method Methods 0.000 description 16
- 238000012360 testing method Methods 0.000 description 15
- 239000000126 substance Substances 0.000 description 10
- 238000004364 calculation method Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 241000208340 Araliaceae Species 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004737 colorimetric analysis Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
Abstract
A kind of bias light compensation device for water quality monitoring of the present utility model, be suitable for water quality monitoring equipment, water quality monitoring equipment comprises light source, clears up colorimetric unit, incident diaphragm, outgoing diaphragm, main optical path light inspection unit and computing unit, and this bias light compensation device comprises background light path light inspection unit, background light path light inspection unit is adjacent to the side of light source, and this background light path light inspection unit is electrically connected with computing unit.By this bias light compensation device, the systematic error that effectively can correct the temperature drift in machine measurement and eliminate because device property produces; Meanwhile, the sensitivity of machine measurement, accuracy, repeatable accuracy and the range of linearity can effectively be improved; Further, further suppress the impact and device property distribution error that output intensity drifts about in time, improve accuracy of measurement and repeatability.
Description
Technical field
The utility model relates to the technical field of water quality monitoring, particularly relates to a kind of bias light compensation device for water quality monitoring.
Background technology
Colorimetric ratio juris is by relatively or measure the method that the coloring matter solution colour degree of depth determines test substance content.Based on colourimetry water quality on-line monitoring instrument primarily of sample introduction and dosage measuring unit, photodiode, clear up colorimetric unit, light inspection unit, computing unit, reagent storage unit form.
Wherein, light inspection unit measures corresponding light intensity respectively before colour developing and after colour developing, and the light intensity before colour developing is I
ginseng, and the light intensity after colour developing is I
ratio.And receive the data of light inspection unit transmission at computing unit after, its meeting is according to formula: A=In (I
ginseng/ I
ratio), to obtain the absorbance A of test substance, and establishing criteria working curve calculates corresponding concentration value C.
And measuring I according to the water quality on-line monitoring instrument that this colourimetry principle makes
ginsengand I
ratiotime, ideally, the light intensity that photodiode sends should be consistent, and this light intensity is referred to as background light intensity; But, because the light intensity of photodiode is very sensitive to temperature variation, and at measurement I
ginsengand I
ratiobetween need will carry out clearing up and chromogenic reaction, it is poor to there is the regular hour in twice measurement, and particularly in the colour developing stage, some reagent also needs heating could produce chromogenic reaction, so, when external environment because of artificially or other reason and temperature decrease time, measurement I
ginsengwith measurement I
ratiotime the photodiode light intensity that sends there will be inconsistent situation.If computing unit is according to above-mentioned measurement I
ginsengwith measurement I
ratiocalculate absorbance, obviously, the accuracy of the absorbance obtained is lower, and repeatability is also poor.
Therefore, be necessary to provide a kind of technological means to address the aforementioned drawbacks.
Utility model content
The purpose of this utility model is the defect overcoming prior art, provides a kind of bias light compensation device for water quality monitoring, the lower and repeated poor problem with the accuracy solving water quality on-line monitoring instrument of the prior art calculating absorbance.
The utility model realizes like this, a kind of bias light compensation device for water quality monitoring, be suitable for water quality monitoring equipment, described water quality monitoring equipment comprises light source, clear up colorimetric unit, incident diaphragm, outgoing diaphragm, main optical path light inspection unit and computing unit, described colorimetric unit of clearing up is close to described light source, described incident diaphragm is located at described light source and is describedly cleared up between colorimetric unit, colorimetric unit is cleared up described in described outgoing diaphragm is adjacent to, described main optical path light inspection unit is adjacent to described outgoing diaphragm, described computing unit is examined unit with described main optical path light and is electrically connected, described bias light compensation device comprises one in order to detect the background light path light inspection unit of the light intensity of light when initial that described light source produces, described background light path light inspection unit is adjacent to the side of described light source, and background light path light inspection unit is electrically connected with described computing unit described in this.
Particularly, described bias light compensation device also comprises in order to transmission and the semi-transparent semi-reflecting lens reflecting the light that described light source produces, the second end that described semi-transparent semi-reflecting lens comprises first end and is oppositely arranged with first end, the first end of described semi-transparent semi-reflecting lens is respectively toward described light source, described background light path light inspection unit, and the second end of described semi-transparent semi-reflecting lens is toward described main optical path light inspection unit.
Further, described light source directive in the angle of the first end of the light of the first end of described semi-transparent semi-reflecting lens and described semi-transparent semi-reflecting lens be a, and 0 ° of < a < 90 °, the angle of the first end of the light that the first end of described semi-transparent semi-reflecting lens reflects and described semi-transparent semi-reflecting lens is b, and b=a.
Preferably, described main optical path light inspection unit is equipped with the first light sensor, and described background light path light inspection unit is equipped with the second light sensor;
Described first light sensor is located on the transmitted light path of described semi-transparent semi-reflecting lens;
Described second light sensor is located on the reflected light path of described semi-transparent semi-reflecting lens.
Selectively, described main optical path light inspection unit is equipped with the first light sensor, and described background light path light inspection unit is equipped with the second light sensor;
Described first light sensor is located on the reflected light path of described semi-transparent semi-reflecting lens;
Described second light sensor is located on the transmitted light path of described semi-transparent semi-reflecting lens.
Particularly, described background light path light inspection unit comprises photo-detector.
The technique effect of a kind of bias light compensation device for water quality monitoring of the present utility model is: by this bias light compensation device, the systematic error that effectively can correct the temperature drift in machine measurement and eliminate because device property produces; Meanwhile, because the calculating of absorbance obtains compensation by light source side-play amount, the technical indicator such as measuring accuracy of sensitivity that machine measures, accuracy, repeatable accuracy and the range of linearity, particularly lower range therefore effectively can be improved; Further, further suppress the impact and device property distribution error that output intensity drifts about in time, improve accuracy of measurement and repeatability, reduce the detection limit of machine.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of bias light compensation device for water quality monitoring of the present utility model;
The computing method preset in the computing unit of Fig. 2 for a kind of water quality monitoring equipment configured for the bias light compensation device of water quality monitoring of the present utility model calculate the FB(flow block) of the concentration of water sample to be checked;
The another kind of computing method preset in the computing unit of Fig. 3 for a kind of water quality monitoring equipment configured for the bias light compensation device of water quality monitoring of the present utility model calculate the FB(flow block) of the concentration of water sample to be checked;
Fig. 4 for a kind of bias light compensation device for water quality monitoring of the present utility model configure the schematic diagram of another embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
a kind of embodiment of the bias light compensation device for water quality monitoring:
embodiment one:
Refer to Fig. 1, below the embodiment one of a kind of bias light compensation device for water quality monitoring of the present utility model is set forth.
The bias light compensation device 60 for water quality monitoring of the present embodiment, be suitable for water quality monitoring equipment 100, and this water quality monitoring equipment 100 comprises light source 10, clears up colorimetric unit 20, incident diaphragm 30, outgoing diaphragm 40, main optical path light inspection unit 50 and computing unit 70, book is described further to each parts of water quality monitoring equipment 100 below:
Light source 10 is for for providing the operation wavelength corresponding with water sample characteristic absorption spectrum to be checked;
Clear up colorimetric unit 20 for reacting and chromogenic reaction in order to clear up water sample to be checked, this is cleared up colorimetric unit 20 and is close to light source 10, wherein, clear up reaction also known as digestion reaction, refer under the condition of heating, utilize strong acid or alkali to carry out reaction treatment to make organic substance decomposing or to make wherein reducing substances destroy to sample, the elemental oxygen of various valence state is changed into single high-valence state or be transformed into the mineral compound being easy to be separated, sample is concentrated simultaneously, namely as clear as crystal without precipitation, thus be convenient to analyze mensuration; Chromogenic reaction, refers to adopt suitable reagent constitutional changes tested in sample to be become the chemical reaction of colored compound;
Incident diaphragm 30 is that the light produced for limiting light source 10 enters the radial dimension clearing up colorimetric unit 20, and wherein, this incident diaphragm 30 is located at light source 10 and is cleared up between colorimetric unit 20;
Outgoing diaphragm 40 is that outgoing diaphragm 40 is adjacent to clears up colorimetric unit 20 for limiting from clearing up the radial dimension of the light that colorimetric unit 20 penetrates wherein;
Main optical path light inspection unit 50 be in order to detection light source 10 produce light through incident diaphragm 30, clear up the light intensity after colorimetric unit 20, outgoing diaphragm 40, wherein, main optical path light examine unit 50 be adjacent to outgoing diaphragm 40;
Computing unit 70 is examine the detection data that transmit of unit 50 by main optical path light for receiving and calculate to obtain the concentration value of water sample to be checked to these data, wherein, this computing unit 70 and main optical path light are examined unit 50 and are electrically connected, and this computing unit 70 is equipped with the computing formula module of the absorbance calculating water sample to be checked.
And the bias light compensation device 60 of the present embodiment comprises one in order to detect the background light path light inspection unit 61 of the light intensity of light when initial that described light source produces, this background light path light inspection unit 61 is adjacent to the side of light source 10, and this background light path light inspection unit 61 is electrically connected with computing unit 70, this computing unit 70 is equipped with to calculate the absorbance of water sample to be checked and is compensated the computing formula module of correction by the offset that background light path light is examined unit 61 and provided in addition.
Wherein, the light that light source 10 produces is injected in incident diaphragm 30 successively, is cleared up colorimetric unit 20, outgoing diaphragm 40 and main optical path light inspection unit 50 and form a main optical path, in addition, the light that produces of this light source 10 also directive in background light path light inspection unit 61 form a background light path.
Thus, when carrying out water quality detection, start light source 10, and light source 10 produce light can successively through incident diaphragm 30, clear up colorimetric unit 20, outgoing diaphragm 40, and be finally incident upon on main optical path light inspection unit 50, simultaneously, measure light respectively clearing up colorimetric unit 20 by main optical path light inspection unit 50 to clear up water sample to be checked and light intensity before chromogenic reaction and afterwards, and by it, related data of acquisition is reached computing unit 70, wherein, the light intensity of the main optical path that main optical path light inspection unit 50 obtains in the pre-test of water sample colour developing to be checked, can be designated as I
r, and after water sample colour developing to be checked, measure the light intensity of the main optical path obtained, can I be designated as
c; Side by side, light intensity when light source 10 is initial, detects by background light path light inspection unit 61, and by it, related data of acquisition is reached computing unit 70, and particularly, background light path light inspection unit 61 measures the light intensity I of main optical path in main optical path light inspection unit 50
rtime, the light intensity of its also corresponding measurement background light path, and be designated as I
rB, in addition, background light path light inspection unit 61 measures the light intensity I of main optical path in main optical path light inspection unit 50
ctime, the light intensity of its also corresponding measurement background light path, and be designated as I
cB; Afterwards, calculate the absorbance of water sample to be checked by computing unit 70 according to computing formula that it is preset and examine the offset that provides of unit 61 by background light path light and compensate correction, to obtain the concentration value of water sample to be checked.
Accordingly, the systematic error that effectively can correct the temperature drift in machine measurement and eliminate because device property produces; Meanwhile, because the calculating of absorbance obtains compensation by light source side-play amount, the technical indicator such as measuring accuracy of sensitivity that machine measures, accuracy, repeatable accuracy and the range of linearity, particularly lower range therefore effectively can be improved; Further, further suppress the impact and device property distribution error that output intensity drifts about in time, improve accuracy of measurement and repeatability, reduce the detection limit of machine.
Refer to Fig. 2, the process that in the present embodiment, computing unit 70 utilizes the computing method preset to calculate the concentration value of water sample to be checked is:
S101, setting feature absorbance formula: A=lg (I
r/ I
c), wherein, A is absorbance;
S102, setting light intensity correction formula: I
r'=I
r(I
cB/ I
rB), wherein I
r' be absorbance;
S103, setting absorbance correction formula: A=lg (I
r'/I
c), substituted into light intensity correction formula, so, developed into A=lg (I
r* I
cB/ I
c* I
rB), wherein, A is absorbance;
S104, the light intensity of main optical path obtained in the pre-test of water sample colour developing to be checked by main optical path light inspection unit 50, and be designated as I
r marks, and after water sample colour developing to be checked, measure the light intensity of the main optical path obtained, and be designated as I
c marks, and the I simultaneously will obtained
r marks, I
c marksdata reach computing unit 70; Meanwhile, measured the light intensity I of main optical path in main optical path light inspection unit 50 by background light path light inspection unit 61
r markstime, the light intensity of its also corresponding measurement background light path, and be designated as I
rB marks, in addition, background light path light inspection unit 61 measures the light intensity I of main optical path in main optical path light inspection unit 50
c markstime, the light intensity of its also corresponding measurement background light path, and be designated as I
cB marks, and the I simultaneously will obtained
rB marks, I
cB marksdata reach computing unit 70; Then, obtain corresponding calibration value by computing unit 70 by the algorithm pre-set, and generate standard working curve according to calibration value;
S105, according to standard working curve and feature absorbance A, calculate the concentration value C of test substance.
Refer to Fig. 3, selectively, in the present embodiment, computing unit 70 also can utilize default another kind of computing method to calculate the concentration value of water sample to be checked, and its detailed process is:
S201, setting feature absorbance formula: A=lg (I
r/ I
c), wherein, A is absorbance;
S202, setting light intensity correction formula: I
r'=I
cB, wherein I
r' be absorbance;
S203, setting absorbance correction formula: A=lg (I
r'/I
c), substituted into light intensity correction formula, so, developed into A=lg (I
cB/ I
c), wherein, A is absorbance;
S204, the light intensity of main optical path obtained in the pre-test of water sample colour developing to be checked by main optical path light inspection unit 50, and be designated as I
r marks, and after water sample colour developing to be checked, measure the light intensity of the main optical path obtained, and be designated as I
c marks, and the I simultaneously will obtained
r marks, I
c marksdata reach computing unit 70; Meanwhile, measured the light intensity I of main optical path in main optical path light inspection unit 50 by background light path light inspection unit 61
r markstime, the light intensity of its also corresponding measurement background light path, and be designated as I
rB marks, in addition, background light path light inspection unit 61 measures the light intensity I of main optical path in main optical path light inspection unit 50
c markstime, the light intensity of its also corresponding measurement background light path, and be designated as I
cB marks, and the I simultaneously will obtained
rB marks, I
cB marksdata reach computing unit 70; Then, obtain corresponding calibration value by computing unit 70 by the algorithm pre-set, and generate standard working curve according to calibration value;
S205, according to standard working curve and feature absorbance A, calculate the concentration value C of test substance.
Refer to Fig. 1, the main optical path light inspection unit 50 of the present embodiment comprises photo-detector, with by photo-detector, ensure the photometric detection to light source 10, wherein, this photo-detector has another name called " photodetector ", is the primary part of photoreceiver, photo-detector is the pith that Fibre Optical Sensor is formed, and its performance index will directly affect the performance of sensor.Meanwhile, photo-detector can detect the luminous power incided on its face, and the change of this luminous power is converted into corresponding electric current.In like manner, the background light path light inspection unit 61 of the present embodiment comprises photo-detector, with by photo-detector, ensures the photometric detection to light source 10.
In addition, for the ease of drawing materials, ensureing Detection job and reduction testing cost, light source 10 is LED light source.Certainly, also selectively, this light source 10 comprises photo-detector, preferably, photo-detector is photodiode, wherein, and photodiode, photodiode (English: photodiode) is made again to be that one by light according to use-pattern, can convert the photo-detector of electric current or voltage signal to.
embodiment two:
Refer to Fig. 4, the embodiment of embodiment two and the embodiment of embodiment one similar, specifically can the elaboration of See Examples one, be not described further, and both differences are herein:
In embodiment two, a kind of bias light compensation device 60 for water quality monitoring comprises all technical characteristics in embodiment one, and it also comprises the semi-transparent semi-reflecting lens 62 of the light produced in order to transmission and reflection source 10, the second end 622 that semi-transparent semi-reflecting lens 62 comprises first end 621 and is oppositely arranged with first end 621, the first end 621 of semi-transparent semi-reflecting lens 62 is respectively toward light source 10, background light path light inspection unit 61, and the second end 622 of semi-transparent semi-reflecting lens 62 is toward main optical path light inspection unit 50.
Wherein, by the setting of semi-transparent semi-reflecting lens 62, light can be reached respectively main optical path, background light path at light source 10 light when loss is lower, meanwhile, also effectively ensure the measurement of main optical path light inspection unit 50, background light path light inspection unit 61 pairs of light source 10 light intensity.
In addition, effectively some light is transmitted through main optical path to make semi-transparent semi-reflecting lens 62 and some light is reflexed to background light path, light source 10 directive in the angle of the first end 621 of the light of the first end 621 of semi-transparent semi-reflecting lens 62 and semi-transparent semi-reflecting lens 62 be a, and 0 ° of < a < 90 °, preferably, 30 ° of < a < 60 °; The angle of the first end 621 of the light that the first end 621 of semi-transparent semi-reflecting lens 62 reflects and semi-transparent semi-reflecting lens 62 is b, and b=a.
Have plenty of again, the main optical path light inspection unit 50 of the present embodiment is equipped with the first light sensor (not indicating in figure), background light path light inspection unit 61 is equipped with the second light sensor (not indicating in figure), wherein, first light sensor is located on the transmitted light path of semi-transparent semi-reflecting lens 62, second light sensor is located on the reflected light path of semi-transparent semi-reflecting lens 62, and the setting of the first light sensor, the second light sensor, be conducive to main optical path light inspection unit 50, background light path light inspection unit 61 is responded to light and measures corresponding light intensity comparatively accurately.
embodiment three:
Refer to Fig. 4, the embodiment of embodiment three and the embodiment of embodiment two similar, specifically can the elaboration of See Examples two, be not described further, and both differences are herein:
In embodiment three, main optical path light inspection unit 50 is equipped with the first light sensor, background light path light inspection unit 61 is equipped with the second light sensor, wherein, first light sensor is located on the reflected light path of semi-transparent semi-reflecting lens 62, second light sensor is located on the transmitted light path of semi-transparent semi-reflecting lens 62, and it also can be conducive to main optical path light inspection unit 50, background light path light inspection unit 61 is responded to light and measures corresponding light intensity comparatively accurately.
the embodiment of water quality monitoring equipment:
embodiment one:
Refer to Fig. 1, below the embodiment one of water quality monitoring equipment of the present utility model is set forth.
The water quality monitoring equipment 100 of the present embodiment, comprise light source 10, clear up colorimetric unit 20, incident diaphragm 30, outgoing diaphragm 40, main optical path light inspection unit 50, bias light compensation device 60 and computing unit 70, book is described further to each parts of water quality monitoring equipment 100 below:
Light source 10 is for for providing the operation wavelength corresponding with water sample characteristic absorption spectrum to be checked;
Clear up colorimetric unit 20 for reacting and chromogenic reaction in order to clear up water sample to be checked, this is cleared up colorimetric unit 20 and is close to light source 10, wherein, clear up reaction also known as digestion reaction, refer under the condition of heating, utilize strong acid or alkali to carry out reaction treatment to make organic substance decomposing or to make wherein reducing substances destroy to sample, the elemental oxygen of various valence state is changed into single high-valence state or be transformed into the mineral compound being easy to be separated, sample is concentrated simultaneously, namely as clear as crystal without precipitation, thus be convenient to analyze mensuration; Chromogenic reaction, refers to adopt suitable reagent constitutional changes tested in sample to be become the chemical reaction of colored compound;
Incident diaphragm 30 is that the light produced for limiting light source 10 enters the radial dimension clearing up colorimetric unit 20, and wherein, this incident diaphragm 30 is located at light source 10 and is cleared up between colorimetric unit 20;
Outgoing diaphragm 40 is that outgoing diaphragm 40 is adjacent to clears up colorimetric unit 20 for limiting from clearing up the radial dimension of the light that colorimetric unit 20 penetrates wherein;
Main optical path light inspection unit 50 be in order to detection light source 10 produce light through incident diaphragm 30, clear up the light intensity after colorimetric unit 20, outgoing diaphragm 40, wherein, main optical path light examine unit 50 be adjacent to outgoing diaphragm 40;
Bias light compensation device 60 comprises one in order to detect the background light path light inspection unit 61 of the light intensity of light when initial that described light source produces, this background light path light inspection unit 61 is adjacent to the side of light source 10, preferably, background light path light inspection unit 61 can be located at the top of light source 10, certainly, also according to actual conditions, background light path light inspection unit 61 can be located at below or other position of light source 10;
Computing unit 70 is examine unit 50 and background light path light by main optical path light examine detection data that unit 61 transmits and the concentration value calculating to obtain water sample to be checked to these data for receiving, wherein, this computing unit 70 examines unit 50 with main optical path light respectively, background light path light is examined unit 61 and is electrically connected, and this computing unit 70 is equipped with to calculate the absorbance of water sample to be checked and is compensated the computing formula module of correction by the offset that background light path light inspection unit 61 provides.
Wherein, the light that light source 10 produces is injected in incident diaphragm 30 successively, is cleared up colorimetric unit 20, outgoing diaphragm 40 and main optical path light inspection unit 50 and form a main optical path, in addition, the light that produces of this light source 10 also directive in background light path light inspection unit 61 form a background light path.
The water quality monitoring equipment 100 of the present embodiment is primarily of light source 10, clear up colorimetric unit 20, incident diaphragm 30, outgoing diaphragm 40, main optical path light inspection unit 50, bias light compensation device 60 and computing unit 70 form, thus, when carrying out water quality detection, start light source 10, and the light that light source 10 produces can successively through incident diaphragm 30, clear up colorimetric unit 20, outgoing diaphragm 40, and be finally incident upon on main optical path light inspection unit 50, simultaneously, measure light respectively clearing up colorimetric unit 20 by main optical path light inspection unit 50 to clear up water sample to be checked and light intensity before chromogenic reaction and afterwards, and by it, related data of acquisition is reached computing unit 70, wherein, the light intensity of the main optical path that main optical path light inspection unit 50 obtains in the pre-test of water sample colour developing to be checked, I can be designated as
r, and after water sample colour developing to be checked, measure the light intensity of the main optical path obtained, can I be designated as
c, side by side, light intensity when light source 10 is initial, detects by background light path light inspection unit 61, and by it, related data of acquisition is reached computing unit 70, and particularly, background light path light inspection unit 61 measures the light intensity I of main optical path in main optical path light inspection unit 50
rtime, the light intensity of its also corresponding measurement background light path, and be designated as I
rB, in addition, background light path light inspection unit 61 measures the light intensity I of main optical path in main optical path light inspection unit 50
ctime, the light intensity of its also corresponding measurement background light path, and be designated as I
cB, afterwards, calculate the absorbance of water sample to be checked by computing unit 70 according to computing formula that it is preset and examine the offset that provides of unit 61 by background light path light and compensate correction, to obtain the concentration value of water sample to be checked.
Accordingly, the systematic error that effectively can correct the temperature drift in machine measurement and eliminate because device property produces; Meanwhile, because the calculating of absorbance obtains compensation by light source side-play amount, the technical indicator such as measuring accuracy of sensitivity that machine measures, accuracy, repeatable accuracy and the range of linearity, particularly lower range therefore effectively can be improved; Further, further suppress the impact and device property distribution error that output intensity drifts about in time, improve accuracy of measurement and repeatability, reduce the detection limit of machine.
Refer to Fig. 2, the process that in the present embodiment, computing unit 70 utilizes the computing method preset to calculate the concentration value of water sample to be checked is:
S101, setting feature absorbance formula: A=lg (I
r/ I
c), wherein, A is absorbance;
S102, setting light intensity correction formula: I
r'=I
r(I
cB/ I
rB), wherein I
r' be absorbance;
S103, setting absorbance correction formula: A=lg (I
r'/I
c), substituted into light intensity correction formula, so, developed into A=lg (I
r* I
cB/ I
c* I
rB), wherein, A is absorbance;
S104, the light intensity of main optical path obtained in the pre-test of water sample colour developing to be checked by main optical path light inspection unit 50, and be designated as I
r marks, and after water sample colour developing to be checked, measure the light intensity of the main optical path obtained, and be designated as I
c marks, and the I simultaneously will obtained
r marks, I
c marksdata reach computing unit 70; Meanwhile, measured the light intensity I of main optical path in main optical path light inspection unit 50 by background light path light inspection unit 61
r markstime, the light intensity of its also corresponding measurement background light path, and be designated as I
rB marks, in addition, background light path light inspection unit 61 measures the light intensity I of main optical path in main optical path light inspection unit 50
c markstime, the light intensity of its also corresponding measurement background light path, and be designated as I
cB marks, and the I simultaneously will obtained
rB marks, I
cB marksdata reach computing unit 70; Then, obtain corresponding calibration value by computing unit 70 by the algorithm pre-set, and generate standard working curve according to calibration value;
S105, according to standard working curve and feature absorbance A, calculate the concentration value C of test substance.
Refer to Fig. 3, selectively, in the present embodiment, computing unit 70 also can utilize default another kind of computing method to calculate the concentration value of water sample to be checked, and its detailed process is:
S201, setting feature absorbance formula: A=lg (I
r/ I
c), wherein, A is absorbance;
S202, setting light intensity correction formula: I
r'=I
cB, wherein I
r' be absorbance;
S203, setting absorbance correction formula: A=lg (I
r'/I
c), substituted into light intensity correction formula, so, developed into A=lg (I
cB/ I
c), wherein, A is absorbance;
S204, the light intensity of main optical path obtained in the pre-test of water sample colour developing to be checked by main optical path light inspection unit 50, and be designated as I
r marks, and after water sample colour developing to be checked, measure the light intensity of the main optical path obtained, and be designated as I
c marks, and the I simultaneously will obtained
r marks, I
c marksdata reach computing unit 70; Meanwhile, measured the light intensity I of main optical path in main optical path light inspection unit 50 by background light path light inspection unit 61
r markstime, the light intensity of its also corresponding measurement background light path, and be designated as I
rB marks, in addition, background light path light inspection unit 61 measures the light intensity I of main optical path in main optical path light inspection unit 50
c markstime, the light intensity of its also corresponding measurement background light path, and be designated as I
cB marks, and the I simultaneously will obtained
rB marks, I
cB marksdata reach computing unit 70; Then, obtain corresponding calibration value by computing unit 70 by the algorithm pre-set, and generate standard working curve according to calibration value;
S205, according to standard working curve and feature absorbance A, calculate the concentration value C of test substance.
Refer to Fig. 1, the main optical path light inspection unit 50 of the present embodiment comprises photo-detector, with by photo-detector, ensure the photometric detection to light source 10, wherein, this photo-detector has another name called " photodetector ", is the primary part of photoreceiver, photo-detector is the pith that Fibre Optical Sensor is formed, and its performance index will directly affect the performance of sensor.Meanwhile, photo-detector can detect the luminous power incided on its face, and the change of this luminous power is converted into corresponding electric current.In like manner, the background light path light inspection unit 61 of the present embodiment comprises photo-detector, with by photo-detector, ensures the photometric detection to light source 10.
In addition, for the ease of drawing materials, ensureing Detection job and reduction testing cost, light source 10 is LED light source.Certainly, also selectively, this light source 10 comprises photo-detector, preferably, photo-detector is photodiode, wherein, and photodiode, photodiode (English: photodiode) is made again to be that one by light according to use-pattern, can convert the photo-detector of electric current or voltage signal to.
Below in conjunction with each graphic, the principle of work of the water quality monitoring equipment 100 of the present embodiment is further described:
When carrying out water quality detection, start light source 10, and light source 10 produce light can successively through incident diaphragm 30, clear up colorimetric unit 20, outgoing diaphragm 40, and be finally incident upon on main optical path light inspection unit 50, simultaneously, measure light respectively clearing up colorimetric unit 20 by main optical path light inspection unit 50 to clear up water sample to be checked and light intensity before chromogenic reaction and afterwards, and by it, related data of acquisition is reached computing unit 70, wherein, the light intensity of the main optical path that main optical path light inspection unit 50 obtains in the pre-test of water sample colour developing to be checked, can be designated as I
r, and after water sample colour developing to be checked, measure the light intensity of the main optical path obtained, can I be designated as
c; Side by side, light intensity when light source 10 is initial, detects by background light path light inspection unit 61, and by it, related data of acquisition is reached computing unit 70, and particularly, background light path light inspection unit 61 measures the light intensity I of main optical path in main optical path light inspection unit 50
rtime, the light intensity of its also corresponding measurement background light path, and be designated as I
rB, in addition, background light path light inspection unit 61 measures the light intensity I of main optical path in main optical path light inspection unit 50
ctime, the light intensity of its also corresponding measurement background light path, and be designated as I
cB; Afterwards, calculate the absorbance of water sample to be checked by computing unit 70 according to computing formula that it is preset and examine the offset that provides of unit 61 by background light path light and compensate correction, to obtain the concentration value of water sample to be checked.
embodiment two:
Refer to Fig. 4, the embodiment of embodiment two and the embodiment of embodiment one similar, specifically can the elaboration of See Examples one, be not described further, and both differences are herein:
In embodiment two, water quality monitoring equipment 100 comprises all technical characteristics in embodiment one, and it also comprises the semi-transparent semi-reflecting lens 62 of the light produced in order to transmission and reflection source 10, the second end 622 that semi-transparent semi-reflecting lens 62 comprises first end 621 and is oppositely arranged with first end 621, the first end 621 of semi-transparent semi-reflecting lens 62 is respectively toward light source 10, background light path light inspection unit 61, and the second end 622 of semi-transparent semi-reflecting lens 62 is toward main optical path light inspection unit 50.
Wherein, by the setting of semi-transparent semi-reflecting lens 62, light can be reached respectively main optical path, background light path at light source 10 light when loss is lower, meanwhile, also effectively ensure the measurement of main optical path light inspection unit 50, background light path light inspection unit 61 pairs of light source 10 light intensity.
In addition, effectively some light is transmitted through main optical path to make semi-transparent semi-reflecting lens 62 and some light is reflexed to background light path, light source 10 directive in the angle of the first end 621 of the light of the first end 621 of semi-transparent semi-reflecting lens 62 and semi-transparent semi-reflecting lens 62 be a, and 0 ° of < a < 90 °, preferably, 30 ° of < a < 60 °; The angle of the first end 621 of the light that the first end 621 of semi-transparent semi-reflecting lens 62 reflects and semi-transparent semi-reflecting lens 62 is b, and b=a.
Have plenty of again, the main optical path light inspection unit 50 of the present embodiment is equipped with the first light sensor (not indicating in figure), background light path light inspection unit 61 is equipped with the second light sensor (not indicating in figure), wherein, first light sensor is located on the transmitted light path of semi-transparent semi-reflecting lens 62, second light sensor is located on the reflected light path of semi-transparent semi-reflecting lens 62, and the setting of the first light sensor, the second light sensor, be conducive to main optical path light inspection unit 50, background light path light inspection unit 61 is responded to light and measures corresponding light intensity comparatively accurately.
embodiment three:
Refer to Fig. 4, the embodiment of embodiment three and the embodiment of embodiment two similar, specifically can the elaboration of See Examples one, be not described further, and both differences are herein:
In embodiment three, main optical path light inspection unit 50 is equipped with the first light sensor, background light path light inspection unit 61 is equipped with the second light sensor, wherein, first light sensor is located on the reflected light path of semi-transparent semi-reflecting lens 62, second light sensor is located on the transmitted light path of semi-transparent semi-reflecting lens 62, and it also can be conducive to main optical path light inspection unit 50, background light path light inspection unit 61 is responded to light and measures corresponding light intensity comparatively accurately.
The foregoing is only the utility model preferred embodiment; its structure is not limited to the above-mentioned shape enumerated; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (6)
1. the bias light compensation device for water quality monitoring, be suitable for water quality monitoring equipment, described water quality monitoring equipment comprises light source, clear up colorimetric unit, incident diaphragm, outgoing diaphragm, main optical path light inspection unit and computing unit, described colorimetric unit of clearing up is close to described light source, described incident diaphragm is located at described light source and is describedly cleared up between colorimetric unit, colorimetric unit is cleared up described in described outgoing diaphragm is adjacent to, described main optical path light inspection unit is adjacent to described outgoing diaphragm, described computing unit is examined unit with described main optical path light and is electrically connected, it is characterized in that: described bias light compensation device comprises one in order to detect the background light path light inspection unit of the light intensity of light when initial that described light source produces, described background light path light inspection unit is adjacent to the side of described light source, and background light path light inspection unit is electrically connected with described computing unit described in this.
2. a kind of bias light compensation device for water quality monitoring as claimed in claim 1, it is characterized in that: also comprise in order to transmission and the semi-transparent semi-reflecting lens reflecting the light that described light source produces, the second end that described semi-transparent semi-reflecting lens comprises first end and is oppositely arranged with first end, the first end of described semi-transparent semi-reflecting lens is respectively toward described light source, described background light path light inspection unit, and the second end of described semi-transparent semi-reflecting lens is toward described main optical path light inspection unit.
3. a kind of bias light compensation device for water quality monitoring as claimed in claim 2, it is characterized in that: described light source directive in the angle of the first end of the light of the first end of described semi-transparent semi-reflecting lens and described semi-transparent semi-reflecting lens be a, and 0 ° of < a < 90 °, the angle of the first end of the light that the first end of described semi-transparent semi-reflecting lens reflects and described semi-transparent semi-reflecting lens is b, and b=a.
4. a kind of bias light compensation device for water quality monitoring as claimed in claim 2, is characterized in that: described main optical path light inspection unit is equipped with the first light sensor, and described background light path light inspection unit is equipped with the second light sensor;
Described first light sensor is located on the transmitted light path of described semi-transparent semi-reflecting lens;
Described second light sensor is located on the reflected light path of described semi-transparent semi-reflecting lens.
5. a kind of bias light compensation device for water quality monitoring as claimed in claim 2, is characterized in that: described main optical path light inspection unit is equipped with the first light sensor, and described background light path light inspection unit is equipped with the second light sensor;
Described first light sensor is located on the reflected light path of described semi-transparent semi-reflecting lens;
Described second light sensor is located on the transmitted light path of described semi-transparent semi-reflecting lens.
6. a kind of bias light compensation device for water quality monitoring as described in any one of claim 1-5, is characterized in that: described background light path light inspection unit comprises photo-detector.
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| CN201520352680.3U CN204679412U (en) | 2015-05-27 | 2015-05-27 | A kind of bias light compensation device for water quality monitoring |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107796763A (en) * | 2017-10-12 | 2018-03-13 | 杭州春来科技有限公司 | With the water quality online analyzer and its light source control method of TEC control light sources |
| CN108254158A (en) * | 2018-01-12 | 2018-07-06 | 深圳奥比中光科技有限公司 | A kind of device and method for monitoring optical element integrality |
| CN109444132A (en) * | 2018-12-25 | 2019-03-08 | 广州市怡文环境科技股份有限公司 | A kind of resolution colorimetric device and equipment |
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2015
- 2015-05-27 CN CN201520352680.3U patent/CN204679412U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107796763A (en) * | 2017-10-12 | 2018-03-13 | 杭州春来科技有限公司 | With the water quality online analyzer and its light source control method of TEC control light sources |
| CN108254158A (en) * | 2018-01-12 | 2018-07-06 | 深圳奥比中光科技有限公司 | A kind of device and method for monitoring optical element integrality |
| CN109444132A (en) * | 2018-12-25 | 2019-03-08 | 广州市怡文环境科技股份有限公司 | A kind of resolution colorimetric device and equipment |
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