CN106442330A - Liquid pH value detection method and device - Google Patents
Liquid pH value detection method and device Download PDFInfo
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- CN106442330A CN106442330A CN201610827002.7A CN201610827002A CN106442330A CN 106442330 A CN106442330 A CN 106442330A CN 201610827002 A CN201610827002 A CN 201610827002A CN 106442330 A CN106442330 A CN 106442330A
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- 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
Abstract
The invention discloses a liquid pH value detection method which comprises the following steps: when putting a standard acid-alkali liquid into a cup body to be detected, acquiring position information of a standard light point that light of a point light source at a preset point is refracted by the cup body to be tested and is mapped to a preset PSD, and a corresponding pH value of the standard acid-alkali liquid detected at present; acquiring position information of a light point to be detected, of the point light source on the PSD when the liquid to be detected is put into the cup body to be detected; and matching the position information to be detected with the position information of the standard light point, and confirming the pH value of the liquid to be detected. The invention further discloses a liquid pH value detection device. By adopting the liquid pH value detection method, the pH value detection accuracy can be improved.
Description
Technical field
The present invention relates to detection technique field, more particularly, to a kind of liquid pH value detection method and device.
Background technology
It is known that Acidity of Aikalinity is one of common counter parameter of liquid (for example when water carries out water quality detection, needing to examine
Survey the Acidity of Aikalinity of water), typically represented with pH value, it is acidity that pH value is less than 7, it is neutrality that pH value is equal to 7, it is alkali that pH value is more than 7
Property.The pH value assay method of liquid adopts colorimetric method under normal circumstances, and colorimetric method needs directly contact liquid sample, due to human eye
The printing impact of the identification on colour vision and colorimetric card, error is larger.
Content of the invention
Present invention is primarily targeted at providing a kind of liquid pH value detection method and device it is intended to improve the standard of PH detection
Really property.
For achieving the above object, a kind of liquid pH value detection method that the present invention provides comprises the following steps：
When standard acid-base liquid is placed in cup to be measured, the light obtaining default spot light is rolled over through described cup to be measured
It is mapped in the standard spot position information on default PSD, and the corresponding pH value of standard acid-base liquid of current detection after penetrating；
When testing liquid is placed in described cup to be measured by acquisition, the luminous point to be measured that described spot light presents on described PSD
Positional information；
Described positional information to be measured is mated with described standard spot position information, is determined the PH of described testing liquid
Value.
Preferably, described when standard acid-base liquid is placed in cup to be measured, the light obtaining default spot light is through institute
Also include before the step of standard spot position information being mapped on default PSD after stating cup refraction to be measured：
According to the refraction effect of the light to described spot light for the described standard acid-base liquid, adjust described PSD and treat with described
Survey the distance between cup, so that the light of described spot light is all mapped on described PSD after described cup to be measured reflects.
Preferably, the described light obtaining default spot light is mapped in default PSD after described cup to be measured reflects
On standard spot position information include：
Obtain in examination criteria soda acid liquid, the first electric signal of described PSD output；
Described first electric signal is carried out analog-to-digital conversion and obtains corresponding first data signal, and according to the described first numeral
Signal determines described standard spot position information；
Described standard spot position information is set up incidence relation with the corresponding pH value of standard acid-base liquid of current detection,
To obtain the corresponding pH value of described standard optoelectronic position information.
Preferably, when testing liquid is placed in described cup to be measured by described acquisition, described spot light presents on described PSD
Spot position information to be measured include：
Obtain when detecting testing liquid, the second electric signal of described PSD output；
Described second electric signal is carried out analog-to-digital conversion and obtains corresponding second data signal, and according to the described second numeral
Signal determines described spot position information to be measured.
Preferably, described standard acid-base liquid includes the liquid of multiple soda acid degree that PH is N；Described N be more than 0 and
Integer less than 14.
Additionally, for achieving the above object, the present invention also provides a kind of liquid pH value detection means, described liquid pH value detection
Device includes：
First acquisition module, during for being placed in standard acid-base liquid in cup to be measured, obtains the light of default spot light
It is mapped in the standard spot position information on default PSD after described cup to be measured reflects, and the standard of current detection
The corresponding pH value of soda acid liquid；
Second acquisition module, when testing liquid being placed in described cup to be measured for obtaining, described spot light is in described PSD
On the spot position information to be measured that presents；
Determining module, for being mated described positional information to be measured with described standard spot position information, determines institute
State the pH value of testing liquid.
Preferably, described liquid pH value detection means also includes：
Adjusting module, for the refraction effect of the light to described spot light according to described standard acid-base liquid, adjusts institute
State the distance between PSD and described cup to be measured, so that the light of described spot light all reflects after described cup to be measured reflects
Penetrate on described PSD.
Preferably, described first acquisition module includes：
First acquisition unit, for obtaining in examination criteria soda acid liquid, the first electric signal of described PSD output；
First converting unit, obtains corresponding first data signal for described first electric signal is carried out analog-to-digital conversion,
And described standard spot position information is determined according to described first data signal；
Processing unit, for by the corresponding pH value of standard acid-base liquid of described standard spot position information and current detection
Set up incidence relation, to obtain the corresponding pH value of described standard optoelectronic position information.
Preferably, described second acquisition module includes：
Second acquisition unit, for obtaining when detecting testing liquid, the second electric signal of described PSD output；
Second converting unit, obtains corresponding second data signal for described second electric signal is carried out analog-to-digital conversion,
And described spot position information to be measured is determined according to described second data signal.
Preferably, described standard acid-base liquid includes the liquid of multiple soda acid degree that PH is N；Described N be more than 0 and
Integer less than 14.
When the present invention is by being placed in standard acid-base liquid in cup to be measured, the light obtaining default spot light is through described
It is mapped in the standard spot position information on default PSD after cup refraction to be measured, and the standard acid-base liquid of current detection
Corresponding pH value；When testing liquid is placed in described cup to be measured by acquisition, what described spot light presented on described PSD treats light-metering
Dot position information；Described positional information to be measured is mated with described standard spot position information, is determined described testing liquid
PH value.Due to detecting the pH value determining testing liquid using light refraction principle, such that it is able to improve the accuracy of PH detection,
Avoid the subjective error of manual identified.
Brief description
Fig. 1 is the schematic flow sheet of fluid present invention pH value detection method first embodiment；
Fig. 2 is that the position of spot light, cup to be measured and PSD in fluid present invention pH value detection method one embodiment is put and shown
Illustration；
Fig. 3 is the schematic flow sheet of fluid present invention pH value detection method second embodiment；
Fig. 4 is that the refinement flow process of fluid present invention pH value detection method 3rd embodiment Plays spot position information is illustrated
Figure；
Fig. 5 is that the refinement flow process of spot position information to be measured in fluid present invention pH value detection method fourth embodiment is illustrated
Figure；
Fig. 6 is the high-level schematic functional block diagram of fluid present invention pH value detection means first embodiment；
Fig. 7 is the high-level schematic functional block diagram of fluid present invention pH value detection means second embodiment；
Fig. 8 is that the refinement functional module of the first acquisition module in fluid present invention pH value detection means 3rd embodiment is illustrated
Figure；
Fig. 9 is that the refinement functional module of the second acquisition module in fluid present invention pH value detection means fourth embodiment is illustrated
Figure.
The realization of the object of the invention, functional characteristics and advantage will be described further in conjunction with the embodiments referring to the drawings.
Specific embodiment
It should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The present invention provides a kind of liquid pH value detection method, with reference to Fig. 1, in one embodiment, this liquid pH value detection side
Method includes：
Step S10, when standard acid-base liquid is placed in cup to be measured, the light obtaining default spot light is treated through described
The standard spot position information being mapped on default PSD after surveying cup refraction, and the standard acid-base liquid pair of current detection
The pH value answered；
Liquid pH value detection method provided in an embodiment of the present invention is used in water quality detection system, for the Acidity of Aikalinity to water
Carry out detection identification.
Specifically, as shown in Fig. 2 in water quality detection system, being preset with spot light, cup to be measured and PSD (photoelectricity successively
Position sensitive detector).Wherein, the light that spot light sends is incident to the liquid refracting in cup to be measured, in cup to be measured
Afterwards, project from the side of cup to be measured, and be mapped on PSD.Thus being exported accordingly according to light irradiation position to PSD by PSD
Impact export corresponding electric signal, to react the positional information of luminous point.For current detection standard acid-base liquid for
PH value actively can be set by user, is currently received the corresponding pH value of standard spot position information to demarcate PSD.Above-mentioned light
The structure in source can be configured according to actual needs, for example, can be ordinary light source or laser instrument etc..
Should illustrate, the setting of the pH-value of above-mentioned standard soda acid liquid can enter setting, according to actual needs at this
It is preferable that standard acid-base liquid includes the liquid of multiple soda acid degree that PH is N in embodiment；Described N is more than 0 and to be less than
14 integer.For example, it is possible to standard acid-base liquid is formed by the soda acid liquid of 13 kinds of different PH.Due to different soda acid liquid
Corresponding refractive index is different, and in therefore 13, the soda acid liquid corresponding standard luminous point information position of different PH is different.The present embodiment
In, examination criteria soda acid liquid is mapped to the standard spot position information on PSD after refraction first, such that it is able to this mark
The pH value of the corresponding position of quasi-optical dot position information is demarcated.
Step S20, when testing liquid is placed in described cup to be measured by acquisition, described spot light presents on described PSD
Spot position information to be measured；
Step S30, described positional information to be measured is mated with described standard spot position information, determines described to be measured
The pH value of liquid.
In the present embodiment, after having detected all of standard acid-base liquid, obtain standard acid-base liquid corresponding standard light
Dot position information.Now, pass mated according to the corresponding spot position information to be measured of testing liquid and standard spot position information
System, you can analysis obtains the corresponding pH value of this testing liquid.For example, the spot position information to be measured of testing liquid and a certain standard
When spot position information overlaps or is close, you can determine that the pH value of this testing liquid is corresponding for this standard acid-base liquid
PH value；When the spot position information to be measured of testing liquid is located between two standard spot position information, according to luminous point to be measured
Positional information distance determines the pH value of testing liquid according to the gap analysis between two standard spot position information.
Further, in order to meet display effect, in the present embodiment, display module can also be preset this pH value is shown
Show.This display module can be LCD or LED.
When the present invention is by being placed in standard acid-base liquid in cup to be measured, the light obtaining default spot light is through described
It is mapped in the standard spot position information on default PSD after cup refraction to be measured, and the standard acid-base liquid of current detection
Corresponding pH value；When testing liquid is placed in described cup to be measured by acquisition, what described spot light presented on described PSD treats light-metering
Dot position information；Described positional information to be measured is mated with described standard spot position information, is determined described testing liquid
PH value.Due to detecting the pH value determining testing liquid using light refraction principle, such that it is able to improve the accuracy of PH detection,
Avoid the subjective error of manual identified.
Further, with reference to Fig. 3, based on fluid present invention pH value detection method first embodiment, in fluid present invention PH
In value detection method second embodiment, also include before above-mentioned steps S10：
Step S40, according to the refraction effect of the light to described spot light for the described standard acid-base liquid, adjusts described PSD
The distance between with described cup to be measured, so that the light of described spot light is all mapped in institute after described cup to be measured reflects
State on PSD.
In the present embodiment, the position of above-mentioned spot light and cup to be measured can be relatively fixed constant, by adjusting the position of PSD
Put so that the light of spot light is all mapped on described PSD after described cup to be measured reflects.Specifically, can arrange
Drive module to be connected with PSD, drive module motion by controlling, thus adjusting the distance between PSD and described cup to be measured.Should
When explanation, adjust the adjustment for horizontal direction of the distance between PSD and described cup to be measured, in another embodiment, also may be used
To include the adjustment to PSD in the vertical direction, here is not further described.
Further, with reference to Fig. 4, based on fluid present invention pH value detection method first embodiment, in fluid present invention PH
In value detection method 3rd embodiment, above-mentioned acquisition preset spot light light be mapped in after described cup to be measured reflects pre-
If PSD on standard spot position information include：
Step S11, obtains in examination criteria soda acid liquid, the first electric signal of described PSD output；
Step S12, described first electric signal is carried out analog-to-digital conversion and obtains corresponding first data signal, and according to described
First data signal determines described standard spot position information；
Step S13, described standard spot position information is set up with the corresponding pH value of standard acid-base liquid of current detection
Incidence relation, to obtain the corresponding pH value of described standard optoelectronic position information.
In the present embodiment, when luminous point incides on PSD, PSD will produce the change of electric signal, and this electric signal is simulation
Signal, can arrange analog to digital conversion circuit on PSD, thus the first electric signal is carried out with analog-to-digital conversion obtain the first numeral letter
Number, this first data signal corresponds to standard spot position information.For example can be divided in the form of coordinate, be determined incident light
Point is in the position (i.e. standard spot position information) of PSD.Then the corresponding pH value of standard acid-base liquid according to current detection with
Standard spot position information is associated, to demarcate the corresponding pH value of standard spot position information.
Further, with reference to Fig. 5, based on fluid present invention pH value detection method 3rd embodiment, in fluid present invention PH
In value detection method fourth embodiment, above-mentioned steps S20 include：
Step S21, obtains when detecting testing liquid, the second electric signal of described PSD output；
Step S22, described second electric signal is carried out analog-to-digital conversion and obtains corresponding second data signal, and according to described
Second data signal determines described spot position information to be measured.
In the present embodiment, after having detected all of standard acid-base liquid, detect testing liquid.In detection testing liquid
When, first testing liquid is placed in cup to be detected, is then turned on spot light；Now obtain the second electric signal of PSD output,
Finally the second electric signal is carried out obtaining the second data signal after analog-to-digital conversion, and spot light warp is determined according to the second data signal
After crossing testing liquid refraction, it is mapped in the spot position information to be measured on PSD.Finally according to this spot position information to be measured and mark
The matching relationship of quasi-optical dot position information, analysis determines the pH value of testing liquid.
The present invention also provides a kind of liquid pH value detection means, with reference to Fig. 6, in one embodiment, the liquid that the present invention provides
Body pH value detection means includes：
First acquisition module 10, during for being placed in standard acid-base liquid in cup to be measured, obtains the light of default spot light
Line is mapped in the standard spot position information on default PSD after described cup to be measured reflects, and the mark of current detection
The corresponding pH value of quasi- soda acid liquid；
Liquid pH value detection means provided in an embodiment of the present invention is used in water quality detection system, for the Acidity of Aikalinity to water
Carry out detection identification.
Specifically, as shown in Fig. 2 in water quality detection system, being preset with spot light, cup to be measured and PSD (photoelectricity successively
Position sensitive detector).Wherein, the light that spot light sends is incident to the liquid refracting in cup to be measured, in cup to be measured
Afterwards, project from the side of cup to be measured, and be mapped on PSD.Thus being exported accordingly according to light irradiation position to PSD by PSD
Impact export corresponding electric signal, to react the positional information of luminous point.For current detection standard acid-base liquid for
PH value actively can be set by user, is currently received the corresponding pH value of standard spot position information to demarcate PSD.Above-mentioned light
The structure in source can be configured according to actual needs, for example, can be ordinary light source or laser instrument etc..
Should illustrate, the setting of the pH-value of above-mentioned standard soda acid liquid can enter setting, according to actual needs at this
It is preferable that standard acid-base liquid includes the liquid of multiple soda acid degree that PH is N in embodiment；Described N is more than 0 and to be less than
14 integer.For example, it is possible to standard acid-base liquid is formed by the soda acid liquid of 13 kinds of different PH.Due to different soda acid liquid
Corresponding refractive index is different, and in therefore 13, the soda acid liquid corresponding standard luminous point information position of different PH is different.The present embodiment
In, examination criteria soda acid liquid is mapped to the standard spot position information on PSD after refraction first, such that it is able to this mark
The pH value of the corresponding position of quasi-optical dot position information is demarcated.
Second acquisition module 20, when testing liquid being placed in described cup to be measured for obtaining, described spot light is described
The spot position information to be measured presenting on PSD；
Determining module 30, for being mated described positional information to be measured with described standard spot position information, is determined
The pH value of described testing liquid.
In the present embodiment, after having detected all of standard acid-base liquid, obtain standard acid-base liquid corresponding standard light
Dot position information.Now, pass mated according to the corresponding spot position information to be measured of testing liquid and standard spot position information
System, you can analysis obtains the corresponding pH value of this testing liquid.For example, the spot position information to be measured of testing liquid and a certain standard
When spot position information overlaps or is close, you can determine that the pH value of this testing liquid is corresponding for this standard acid-base liquid
PH value；When the spot position information to be measured of testing liquid is located between two standard spot position information, according to luminous point to be measured
Positional information distance determines the pH value of testing liquid according to the gap analysis between two standard spot position information.
Further, in order to meet display effect, in the present embodiment, display module can also be preset this pH value is shown
Show.This display module can be LCD or LED.
When the present invention is by being placed in standard acid-base liquid in cup to be measured, the light obtaining default spot light is through described
It is mapped in the standard spot position information on default PSD after cup refraction to be measured, and the standard acid-base liquid of current detection
Corresponding pH value；When testing liquid is placed in described cup to be measured by acquisition, what described spot light presented on described PSD treats light-metering
Dot position information；Described positional information to be measured is mated with described standard spot position information, is determined described testing liquid
PH value.Due to detecting the pH value determining testing liquid using light refraction principle, such that it is able to improve the accuracy of PH detection,
Avoid the subjective error of manual identified.
Further, with reference to Fig. 7, based on fluid present invention pH value detection means first embodiment, in fluid present invention PH
In value detection device second embodiment, aforesaid liquid pH value detection means also includes：
Adjusting module 40, for the refraction effect of the light to described spot light according to described standard acid-base liquid, adjusts
The distance between described PSD and described cup to be measured, so that the light of described spot light is equal after described cup to be measured reflects
It is mapped on described PSD.
In the present embodiment, the position of above-mentioned spot light and cup to be measured can be relatively fixed constant, by adjusting the position of PSD
Put so that the light of spot light is all mapped on described PSD after described cup to be measured reflects.Specifically, can arrange
Drive module to be connected with PSD, drive module motion by controlling, thus adjusting the distance between PSD and described cup to be measured.Should
When explanation, adjust the adjustment for horizontal direction of the distance between PSD and described cup to be measured, in another embodiment, also may be used
To include the adjustment to PSD in the vertical direction, here is not further described.
Further, with reference to Fig. 8, based on fluid present invention pH value detection means first embodiment, in fluid present invention PH
In value detection device 3rd embodiment, above-mentioned first acquisition module 10 includes：
First acquisition unit 11, for obtaining in examination criteria soda acid liquid, the first electric signal of described PSD output；
First converting unit 12, obtains corresponding first numeral letter for described first electric signal is carried out analog-to-digital conversion
Number, and described standard spot position information is determined according to described first data signal；
Processing unit 13, for by the corresponding PH of standard acid-base liquid of described standard spot position information and current detection
Value sets up incidence relation, to obtain the corresponding pH value of described standard optoelectronic position information.
In the present embodiment, when luminous point incides on PSD, PSD will produce the change of electric signal, and this electric signal is simulation
Signal, can arrange analog to digital conversion circuit on PSD, thus the first electric signal is carried out with analog-to-digital conversion obtain the first numeral letter
Number, this first data signal corresponds to standard spot position information.For example can be divided in the form of coordinate, be determined incident light
Point is in the position (i.e. standard spot position information) of PSD.Then the corresponding pH value of standard acid-base liquid according to current detection with
Standard spot position information is associated, to demarcate the corresponding pH value of standard spot position information.
Further, with reference to Fig. 9, based on fluid present invention pH value detection means 3rd embodiment, in fluid present invention PH
In value detection device fourth embodiment, above-mentioned second acquisition module 20 includes：
Second acquisition unit 21, for obtaining when detecting testing liquid, the second electric signal of described PSD output；
Second converting unit 22, obtains corresponding second numeral letter for described second electric signal is carried out analog-to-digital conversion
Number, and described spot position information to be measured is determined according to described second data signal.
In the present embodiment, after having detected all of standard acid-base liquid, detect testing liquid.In detection testing liquid
When, first testing liquid is placed in cup to be detected, is then turned on spot light；Now obtain the second electric signal of PSD output,
Finally the second electric signal is carried out obtaining the second data signal after analog-to-digital conversion, and spot light warp is determined according to the second data signal
After crossing testing liquid refraction, it is mapped in the spot position information to be measured on PSD.Finally according to this spot position information to be measured and mark
The matching relationship of quasi-optical dot position information, analysis determines the pH value of testing liquid.
These are only the preferred embodiments of the present invention, not thereby limit the present invention the scope of the claims, every using this
Equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of liquid pH value detection method is it is characterised in that described liquid pH value detection method comprises the following steps：
When standard acid-base liquid is placed in cup to be measured, the light obtaining default spot light is after described cup to be measured reflects
It is mapped in the standard spot position information on default PSD, and the corresponding pH value of standard acid-base liquid of current detection；
When testing liquid is placed in described cup to be measured by acquisition, the light spot position to be measured that described spot light presents on described PSD
Information；
Described positional information to be measured is mated with described standard spot position information, is determined the pH value of described testing liquid.
2. liquid pH value detection method as claimed in claim 1 it is characterised in that described standard acid-base liquid is placed in be measured
When in cup, the light obtaining default spot light is mapped in the standard light on default PSD after described cup to be measured reflects
Also include before the step of dot position information：
According to the refraction effect of the light to described spot light for the described standard acid-base liquid, adjust described PSD and described cup to be measured
The distance between body, so that the light of described spot light is all mapped on described PSD after described cup to be measured reflects.
3. liquid pH value detection method as claimed in claim 1 is it is characterised in that the light warp of spot light is preset in described acquisition
The standard spot position information being mapped on default PSD after crossing described cup refraction to be measured includes：
Obtain in examination criteria soda acid liquid, the first electric signal of described PSD output；
Described first electric signal is carried out analog-to-digital conversion and obtains corresponding first data signal, and according to described first data signal
Determine described standard spot position information；
Described standard spot position information is set up incidence relation with the corresponding pH value of standard acid-base liquid of current detection, with
To the corresponding pH value of described standard optoelectronic position information.
4. liquid pH value detection method as claimed in claim 3 it is characterised in that described acquisition testing liquid is placed in described
During cup to be measured, the spot position information to be measured that described spot light presents on described PSD includes：
Obtain when detecting testing liquid, the second electric signal of described PSD output；
Described second electric signal is carried out analog-to-digital conversion and obtains corresponding second data signal, and according to described second data signal
Determine described spot position information to be measured.
5. liquid pH value detection method as claimed in claim 1 is it is characterised in that it is N that described standard acid-base liquid includes PH
Multiple soda acid degree liquid；Described N be more than 0 and less than 14 integer.
6. a kind of liquid pH value detection means is it is characterised in that described liquid pH value detection means includes：
First acquisition module, during for being placed in standard acid-base liquid in cup to be measured, the light obtaining default spot light passes through
It is mapped in the standard spot position information on default PSD after described cup refraction to be measured, and the standard acid-base of current detection
The corresponding pH value of liquid；
Second acquisition module, when testing liquid being placed in described cup to be measured for obtaining, described spot light is on described PSD
Existing spot position information to be measured；
Determining module, for being mated described positional information to be measured with described standard spot position information, is treated described in determination
Survey the pH value of liquid.
7. liquid pH value detection means as claimed in claim 6 is it is characterised in that described liquid pH value detection means is also wrapped
Include：
Adjusting module, for the refraction effect of the light to described spot light according to described standard acid-base liquid, adjusts described PSD
The distance between with described cup to be measured, so that the light of described spot light is all mapped in institute after described cup to be measured reflects
State on PSD.
8. liquid pH value detection means as claimed in claim 6 is it is characterised in that described first acquisition module includes：
First acquisition unit, for obtaining in examination criteria soda acid liquid, the first electric signal of described PSD output；
First converting unit, obtains corresponding first data signal for described first electric signal is carried out analog-to-digital conversion, and root
Determine described standard spot position information according to described first data signal；
Processing unit, for setting up described standard spot position information with the corresponding pH value of standard acid-base liquid of current detection
Incidence relation, to obtain the corresponding pH value of described standard optoelectronic position information.
9. liquid pH value detection means as claimed in claim 8 is it is characterised in that described second acquisition module includes：
Second acquisition unit, for obtaining when detecting testing liquid, the second electric signal of described PSD output；
Second converting unit, obtains corresponding second data signal for described second electric signal is carried out analog-to-digital conversion, and root
Determine described spot position information to be measured according to described second data signal.
10. liquid pH value detection means as claimed in claim 9 is it is characterised in that it is N that described standard acid-base liquid includes PH
Multiple soda acid degree liquid；Described N be more than 0 and less than 14 integer.
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