CN103698287B - For detecting the dim light signal detection device of seawater pH value - Google Patents
For detecting the dim light signal detection device of seawater pH value Download PDFInfo
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Abstract
The invention discloses a kind of dim light signal detection device for detecting pH value of seawater, being provided with the flow path system for flow through seawater sample and indicator, light path detection that the mixed solution for the seawater sample in flow path system or seawater sample and indicator carries out illumination detection and the detection signal that light path detection exports is received and completes the master control system that seawater sample pH value calculates.The present invention is directed to this special domain design dim light signal detection device of pH value of seawater, adopt accurate light path detection and the flow path system of compact, realize gathering low level light signal to the operation controlling the full-automatic process that water sample mixed allocation controls, not only avoid the clumsy complicated manual operation of various laboratories PH detecting instrument, save energy and cost, and the professional advantage of formation and high-performance equipment can be guaranteed information acquisition, process and control more adding system, efficient.
Description
Technical field
The invention belongs to ocean monitoring technologytechnologies field, specifically, relating to a kind of device for detecting the pH value of seawater.
Background technology
PH value is one of important parameter of seawater carbonate system, is also the positive evidence of Ocean acidification.Marine carbon circulation and Ocean acidification research need the pH value of accurately monitoring seawater continuously.China is ocean big country, the research of Ocean acidification and carbon cycle system is the vital task of relation marine environment, early warning of marine disasters, marine safety and marine resources development, and seawater pH value is one of important indicator of reflection marine carbon circulating system, therefore, the safety monitoring of pH value to marine environment detecting seawater is most important.
At present in the world, the method for on-line checkingi pH value mainly contains two kinds: one is electrode method; One is spectrophotometric method.The accuracy of detection limit of electrode method is ± 0.005, and the accuracy of detection limit of spectrophotometric method is ± 0.0007.Adopt the pick-up unit of electrode method design, its advantage is cheap, but precision is low, needs often correct and change probe.And the pick-up unit adopting spectrophotometric method to design, its accuracy in detection is high, and precision is good, and without the need to correcting, has therefore become the standard method measuring seawater pH value in the research of current seawater carbonate system.Although external scientific research personnel have developed a series of pH value Analytical system based on spectrophotometric method design, but mostly bulky, instrument is clumsy, and need complicated manual operation, marine carbon circulation, seawater the acidifying even needs of global climate change study cannot be met completely.
Summary of the invention
The present invention is directed to seawater pH value and detect this application, devise a kind of dim light signal detection device, to simplify manual operation, improve the accuracy of detection of seawater pH value.
For solving the problems of the technologies described above, the present invention is achieved by the following technical solutions:
For detecting a dim light signal detection device for seawater pH value, be provided with
Flow path system, for flow through seawater sample and indicator, comprises flow cell;
Light path detection, the mixed solution for the seawater sample in flow path system or seawater sample and indicator carries out illumination detection, comprises LED light source, and enters three and go out fiber coupler, three optical filters and three photodiodes; The mixed solution of described LED light source to the seawater sample in flow cell or seawater sample and indicator irradiates, coupling light through seawater sample or described mixed solution is injected one and is entered three and go out fiber coupler, enter three through one to go out fiber coupler single channel light is divided into three road light, directive three optical filters respectively, light directive three photodiodes respectively of three road specific wavelengths are leached via three optical filters, after carrying out opto-electronic conversion respectively via three photodiodes, export three road detection signals;
Master control system, receives the detection signal that three photodiode converts export, calculates the pH value of seawater sample.
In order to realize the quantitative sampling of seawater sample and indicator, be also provided with T-valve group, water sample pump, indicator pump and two-way quantitative loop in described flow path system, described flow cell is connected in first via quantitative loop; When carrying out illumination to seawater sample and detecting, control T-valve group and form two open loop stream, under the driving of water sample pump, by first via quantitative loop, quantitative sampling is carried out to seawater sample; Under the driving of indicator pump, by the second tunnel quantitative loop, quantitative sampling is carried out to indicator;
When carrying out illumination to the mixed solution of seawater sample and indicator and detecting, control T-valve group and form single closed loop stream, described two-way quantitative loop is connected, form closed circuit, and under the driving of water sample pump or indicator pump, seawater sample and indicator are flowed in closed circuit, fully carries out illumination detection again after mixing.
In order to increase the volume of flow cell, and reduce the hold-up volume of solution, avoid bubble to retain, described flow cell is preferably designed to tapered flow cell, is connected in the summit of tapered flow cell and bottom surface in first via quantitative loop as far as possible; In the side of tapered flow cell, the relative both sides design interface in position, enter three respectively by optical fiber and LED light source and one and go out that fiber coupler is corresponding to be of coupled connections, to shorten optical path length, improve accuracy of detection.
As a kind of preferred circuit assembling structure of described master control system, in described master control system, be provided with primary processor, LED light source driver module, low level light signal acquisition module and pump valve driver module; Described primary processor, after test starts, performs following control procedure:
A, the communication paths of control pump valve driver module to T-valve group adjust, and make first via quantitative loop be connected between seawater sample container and waste liquid pool, the second tunnel quantitative loop is connected between marker container and waste liquid pool;
B, control pump valve driver module start water sample pump and indicator pump respectively, rinse and complete quantitative sampling to the pipeline of two-way quantitative loop;
C, control LED light source driver module start, and driving LED light source luminescent, irradiates seawater sample in flow cell, and control the seawater sample detection signal that low level light signal acquisition module gathers three road photodiodes outputs, line item of going forward side by side;
D, control LED light source driver module are closed;
E, the communication paths of control pump valve driver module to T-valve group adjust, and two-way quantitative loop is connected, forms closed circuit; Then, start water sample pump, drive the seawater sample of quantitative sampling and indicator to flow in closed circuit, after fully mixing, control water sample pump and stop;
F, control LED light source driver module start, and driving LED light source luminescent, irradiates mixed solution in flow cell, and control the mixed solution detection signal that low level light signal acquisition module gathers three road photodiodes outputs, line item of going forward side by side;
G, according to record seawater sample detection signal and mixed solution detection signal, calculate the pH value of Oceanic Samples.
In order to improve the degree of stability that LED light source irradiates, in described LED light source driver module, be provided with constant current reference source, described constant current reference source, after the enabling signal receiving primary processor output, exports steady current to LED light source, driving LED light source transmitting white.
Further, in described low level light signal acquisition module, shaping filter buffer circuit, programmable gain amplifier and A/D converter is provided with; Described shaping filter buffer circuit receives the detection signal that three road photodiodes export, after Bing Dui tri-road detection signal carries out isolation and shaping filter process, be sent to programmable gain amplifier to amplify, then be sent to after A/D converter carries out analog to digital conversion, export described primary processor to; Described primary processor output gain is selected to control signal to programmable gain amplifier, regulates the enlargement factor of programmable gain amplifier.
Further, in described dim light signal detection device, power module, memory module and communication module is also provided with; Described power module receives powered battery, and to convert different direct supplys to be different electricity consumption load supplyings in device; The detection signal received and result of calculation write memory module are preserved by described primary processor, and result of calculation is uploaded to host computer by communication module.
Compared with prior art, advantage of the present invention and good effect are: the present invention is directed to this special domain design dim light signal detection device of seawater pH value, adopt accurate light path detection and the flow path system of compact, realize gathering low level light signal to the operation controlling the full-automatic process that water sample mixed allocation controls, not only avoid the clumsy complicated manual operation of various laboratories pH detecting instrument, save energy and cost, and the professional advantage of formation and high-performance equipment can be guaranteed information acquisition, process and control more adding system, efficient.
After reading the detailed description of embodiment of the present invention by reference to the accompanying drawings, the other features and advantages of the invention will become clearly.
Accompanying drawing explanation
Fig. 1 is the flow path system connected graph of dim light signal detection device when carrying out illumination to seawater sample and detecting proposed by the invention;
Fig. 2 is dim light signal detection device proposed by the invention carrying out flow path system connected graph when illumination detects to the mixed solution of seawater sample and indicator;
Fig. 3 is the theory diagram of a kind of embodiment of master control system in dim light signal detection device proposed by the invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
The present embodiment, for the pH value parameter of seawater, devises a kind of dim light signal detection device, mainly comprises flow path system, light path detection and master control system.Wherein, flow path system primary responsibility injects flow cell by seawater sample or by the mixed solution of seawater sample and indicator, detects so that carry out follow-up illumination.In order to realize the quantitative sampling of seawater sample and indicator, and automatically mix, the present embodiment devises T-valve group 1, water sample pump 2, indicator pump 3, first quantitative loop 5, second quantitative loop 4 and flow cell 6 in described flow path system, shown in Fig. 1, Fig. 2.In the present embodiment, described T-valve group 1 preferably adopts four T-valve and four threeways to be formed by connecting, by switching the connecting path of four T-valve, to form two open loop stream (as shown in Figure 1) or single closed loop stream (as shown in Figure 2).
Specifically, flow cell 6 is connected in the first quantitative loop 5, by the distinct interface of the head and the tail two ends of two quantitative loop 4,5 difference connecting tee valve group 1, and connect the container for splendid attire seawater sample, the container for splendid attire indicator and waste liquid pool by T-valve group 1.Water sample pump 2 is set in the first quantitative loop 5, drives seawater sample to flow in the first quantitative loop 5 and flow cell 6 by water sample pump 2; Indicator pump 3 is set in the second quantitative loop 4, drives indicator to flow in the second quantitative loop 4 by indicator pump 3.According to the blending ratio of seawater sample and indicator, regulate the length of two-way quantitative loop 4,5, to realize the quantitative sampling of seawater sample and indicator.
In the present embodiment, described water sample pump 2 and indicator pump 3 preferably adopt peristaltic pump, promote the solution in quantitative loop 4,5.
In order under the prerequisite increasing flow cell volume as far as possible, reduce the hold-up volume (dead volume) of reaction solution, realize reagent noresidue, flow cell 6 is designed to tapered by the present embodiment, as shown in Figure 1 and Figure 2.This tapered flow cell 6 compares traditional Z-type flow cell, owing to occurring without right angle, therefore substantially there is no hold-up volume, bubble not easily retains, and go out that fiber coupler is corresponding to be respectively of coupled connections on the interface that two positions of the side of tapered flow cell 6 are relative by LED light source and being entered three, greatly can shorten the length that incident light passes seawater sample or mixed solution thus, very favourable to raising accuracy of detection.At the summit of tapered flow cell 6 and bottom surface design interface respectively, be connected in the first described quantitative loop 5, to guarantee that seawater sample or mixed solution can be full of whole flow cell 6, to improve accuracy of detection further in the process of circulation.
In light path detection, be provided with LED light source 10, enter three and go out fiber coupler 7, filter set 8 and photodiode group 9, shown in Fig. 1, Fig. 2.In the present embodiment, described LED light source 10 preferably adopts the LED of white high bright degree, launches the solution in the white light flow cell 6 of high brightness.Three optical filters are provided with in described filter set 8, the filter wavelength of three optical filters is different, divide correspondingly and be located at one and enter the three exit portal places, road that three go out fiber coupler 7, filter to entering the three three road light going out fiber coupler 7 injection by one, extract the light of required wavelength, project to photodiode group 9.Three photodiodes are provided with in described photodiode group 9, receive the light of the three road specific wavelengths exported by three filter plates optical filterings respectively, after Bing Dui tri-road light carries out opto-electronic conversion, formation voltage or current detection signal, export master control system to.
The chief components such as primary processor CPU, LED light source driver module, low level light signal acquisition module and pump valve driver module are provided with in described master control system, shown in Figure 3.Wherein, primary processor CPU preferably adopts 32 ARM chips as main control unit, LED light source, water sample pump 2, indicator pump 3 and T-valve group 1 is controlled according to sort run during the flow process set by LED light source driver module and pump valve driver module, and the detection signal of three photodiode converts outputs is gathered by low level light signal acquisition module, complete the calculating of seawater sample pH value.
In the present embodiment, in order to make the light launched by LED light source more stable, to improve the precision that seawater sample detects, for described LED light source driver module, the stability contorting that the present embodiment preferably adopts constant current reference source to realize LED light source, as shown in Figure 3.Described constant current reference source is connected primary processor CPU, after the control voltage receiving primary processor CPU output, exports constant driven with current sources LED light source stabilized illumination.The size of primary processor CPU by regulating it to export the control voltage of constant current reference source to, just can automatically adjust to the size of current that constant current reference source exports, and then realizes the adjustment as required to LED light source luminosity.
By the light of LED light source directive flow cell, enter three through the solution directive one in flow cell and go out fiber coupler, enter three via one to go out fiber coupler one road light of incidence is divided into three road light, leach three road light directive three photodiodes respectively of different wave length respectively by three optical filters, generate three road detection signals via three photodiode converts and export low level light signal acquisition module to.In order to improve the accuracy gathered detection signal, the present embodiment is decision design shaping filter buffer circuit, programmable gain amplifier and A/D converter in described low level light signal acquisition module, shown in Figure 3.After the three road detection signals exported by three photodiode converts carry out signal isolation and wave shaping, filtering process via shaping filter buffer circuit, export programmable gain amplifier to and carry out signal amplification process, then transfer to after A/D converter converts simulating signal to digital signal, be sent to described primary processor CPU.In order to improve conversion accuracy, described A/D converter preferably adopts 16 A/D converters, exports primary processor CPU to do further data smoothing filtering process to change generation 16 position digital signal.For the data after process, primary processor CPU mono-aspect can be stored in the memory module in dim light signal detection device according to fixing encryption format, such as can write in FLASH memory, so that the follow-up calculating to seawater sample pH value of primary processor CPU via latch cicuit by the SPI interface of primary processor CPU; Host computer can be uploaded to by communication module on the other hand, monitor.In the present embodiment, the primary processor CPU described in described communication module connects preferably by general serial asynchronous bus UART, receives the data after process, and converts the serial data of RS232 form to, be uploaded to host computer.Described host computer carries out data communication by RS232 universal serial bus and described dim light signal detection device, realizes the real-time monitoring to dim light signal detection device.
Enlargement factor for programmable gain amplifier can be regulated by primary processor CPU, as shown in Figure 3.Primary processor CPU selects to control signal to programmable gain amplifier by one road I/O mouth output gain, by regulating the enlargement factor of programmable gain amplifier, to regulate the amplitude of the detection signal exported by programmable gain amplifier.
Another latch cicuit and control module is provided with in described pump valve driver module, primary processor CPU is after startup seawater sample detection procedure, control signal is exported according to the sequential flow process of setting, control module is transferred to via another latch cicuit, improved the load capacity of control signal by control module, realize the control to T-valve group, water sample pump or indicator pump.
In order to ensure that dim light signal detection device can work for a long time under water, the present embodiment preferably adopts 12V battery to provide electric power supply for whole dim light signal detection device.Convert via power module of voltage regulation the 12V direct current supply that battery exports to 5V or 3.3V direct supply, exporting each electric loading in master control system to, is each electricity consumption load supplying.
Below in conjunction with the system architecture shown in Fig. 1-Fig. 3, the specific works flow process of the dim light signal detection device that the present embodiment proposes is set forth in detail.
(1) in sampling receptacle, inject enough seawater samples to be detected, in indicator solution, inject enough indicator.
In the present embodiment, preferably adopt m-cresol purple as described indicator, mix with seawater sample to be detected.Due to m-cresol purple temperature be 25 DEG C, salinity be 35 time, its dissociation constant
value be 8.006, and variation range conforms to the pH value of seawater, is therefore to measure indicator comparatively conventional in seawater pH value research.
Certainly, described indicator also can select phenol red, cresol red, thymol blue etc., and the present embodiment is not limited in above citing.
(2) primary processor CPU outputs control signals to T-valve group 1, and 1. with 2. the liquid in-out mouth controlling four T-valve in T-valve group 1 is communicated with, and forms two open loop stream, shown in Figure 1.
(3) primary processor CPU outputs control signals to water sample pump 2 and indicator pump 3, start water sample pump 2 extracting seawater sample to the first quantitative loop 5, and enter waste liquid pool via flow cell 6 and T-valve group 1, the pipeline of the first quantitative loop 5 and flow cell 6 are rinsed, and completes the quantitative sampling of seawater sample.Meanwhile, start indicator pump 3 and extract indicator to the second quantitative loop 4, make indicator be full of whole second quantitative loop 4, and enter waste liquid pool by T-valve group 1, the pipeline of the second quantitative loop 4 is rinsed, and completes the quantitative sampling of indicator.
(4) primary processor CPU startup LED drive module exports constant current source, and driving LED light source 10 is luminous, irradiates the seawater sample in flow cell 6.Light through seawater sample enters three to one and goes out fiber coupler 7, through coupling mechanism 7, a road light is divided into three road light directive three optical filters respectively, via the light of three optical filter optical filtering output three road different wave lengths, and directive three photodiodes respectively.
In the present embodiment, the filter wavelength preferably arranging three optical filters is respectively λ 1, λ 2, λ 3, wherein, λ 1 is the alkali state maximum absorption wavelength of indicator, and λ 2 is the acid-state maximum absorption wavelength of indicator, and λ 3 is reference wavelength, at reference wavelength λ 3 place, λ 3, all without absorption, therefore can use as tuning wavelength, to eliminate the de-stabilising effect of incident light by the acid-state of indicator and alkali state.
As a kind of preferred design of the present embodiment, for m-cresol purple indicator, the present embodiment preferably arranges λ 1=578nm, λ 2=432nm, λ 3=730nm.For the indicator of other types, can according to its characteristic specifically selected corresponding with it λ 1, λ 2, λ 3.
(5) primary processor CPU gathers the detection signal of three photodiode converts outputs by low level light signal acquisition module, i.e. seawater sample detection signal, and is designated as respectively: I
λ 1 seawater, I
λ 2 seawater, I
λ 3 seawater, write memory module is preserved, and is uploaded to host computer.
(6) primary processor CPU control LED light source 10 extinguishes, and the connecting pipeline of T-valve group 1 is switched, 1. with 3. the liquid in-out mouth of in T-valve group 1 four T-valve is communicated with, and then two quantitative loop 4,5 are communicated with, form closed circuit, namely single closed loop stream is formed, shown in Figure 2.
(7) start water sample pump 2 to run, promotes seawater sample in two quantitative loop 4,5 and indicator flows the sufficiently long time (being preferably greater than 5 minutes) in closed loop, seawater sample and indicator are fully mixed.To be mixed evenly after, control water sample pump 2 and stop, completing seawater sample and mix with the proportioning of indicator.
(8) LED light source 10 is again started luminous, irradiate the mixed solution of seawater sample and indicator in flow cell 6, and start the light that three road photodiodes receive three road different wave lengths simultaneously, and after carrying out opto-electronic conversion, export three road mixed solution detection signals, be designated as respectively: I
λ 1 mixed solution, I
λ 2 mixed solution, I
λ 3 mixed solution, write memory module is preserved, and is uploaded to host computer.
Because the mensuration process of mixed solution is carried out in the cyclic system closed, the impact that the factors such as gas exchanges calculate seawater sample pH value therefore can be avoided.
(9) primary processor CPU utilizes the three road seawater sample detection signal I received
λ 1 seawater, I
λ 2 seawater, I
λ 3 seawaterwith three road mixed solution detection signal I
λ 1 mixed solution, I
λ 2 mixed solution, I
λ 3 mixed solution, calculate the pH value of seawater sample to be measured.Concrete computation process is as follows:
Utilize formula
calculate the pH value of seawater sample.Wherein,
for the dissociation constant of indicator; [I
2-] and [HI
-] be respectively the alkali state of indicator and the equilibrium concentration of acid-state.
In the present embodiment, for m-cresol purple indicator, its dissociation constant
value directly can determine according to the temperature of test and salinity, namely temperature be 20 DEG C≤under T≤30 DEG C and salinity be the condition of 30≤S≤37,
Setting indicator is A in the absorbance at wavelength X 1, λ 2 place
λ 1and A
λ 2, then the pH value of seawater sample can be calculated by following formula:
Wherein,
e
1, e
2, e
3for indicator is at the molar absorption coefficient ratio at maximum absorption wavelength λ 1, λ 2 place, and
Wherein,
for acid-state and the maximum absorption wavelength λ 1 of alkali state at them, the molar absorptivity at λ 2 place of indicator.Using reference wavelength λ 3 as tuning wavelength, introducing absorbance is A
λ 1and A
λ 2calculating, the consistance of sample determination condition can be guaranteed, to improve the preci-sion and accuracy of mensuration further.
For the indicator of other types, the associated hot mechanical constant of spectrophotometry indicator can be adopted
then, above-mentioned formulae discovery is utilized to go out the pH value of seawater sample.At present, researchist measures the associated hot mechanical constant of some indicator, such as: phenol red, cresol red, thymol blue etc., these data can directly be quoted.
(10) result of calculation is write memory module by primary processor CPU, and is uploaded to host computer by communication module, completes the mensuration to seawater sample.
The dim light signal detection device precision of the present embodiment is high, accuracy is good, easy and simple to handle, the pH value of seawater sample can be calculated again in conjunction with the physical and chemical parameter (temperature, salinity) of mensuration process by the absorbance measuring seawater sample, without the need to using pH standard buffer solution to correct, be applicable to on-site measurement.In addition, the dim light signal detection device stability of the present embodiment is strong, the working environment of various marine monitoring can be adapted to, even rugged surroundings, meet many performances such as the strong anti-interference of seawater pH value detection requirement, high reliability and low-power consumption, the conventional framework of various original position seawater pH monitoring system can be adapted to well.
The dim light signal detection device of the present embodiment can carry on buoy, the automatically marine monitoring system such as the station and seashore base/platform base, and then all kinds of marine monitoring engineering and Science Research Project that current China extensively and for a long time carries out can be born.
Certainly, the above is only a kind of preferred implementation of the present invention, should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1., for detecting a dim light signal detection device for seawater pH value, be provided with
Flow path system, for flow through seawater sample and indicator, comprises flow cell;
Light path detection, the mixed solution for the seawater sample in flow path system or seawater sample and indicator carries out illumination detection, comprises LED light source, and enters three and go out fiber coupler, three optical filters and three photodiodes; The mixed solution of described LED light source to the seawater sample in flow cell or seawater sample and indicator irradiates, coupling light through seawater sample or described mixed solution is injected one and is entered three and go out fiber coupler, enter three through one to go out fiber coupler single channel light is divided into three road light, directive three optical filters respectively, light directive three photodiodes respectively of three road specific wavelengths are leached via three optical filters, after carrying out opto-electronic conversion respectively via three photodiodes, export three road detection signals;
Master control system, receives the detection signal that three photodiode converts export, calculates the pH value of seawater sample;
In described flow path system, be also provided with T-valve group, water sample pump, indicator pump and two-way quantitative loop, described flow cell is connected in first via quantitative loop; When carrying out illumination to seawater sample and detecting, control T-valve group and form two open loop stream, under the driving of water sample pump, by first via quantitative loop, quantitative sampling is carried out to seawater sample; Under the driving of indicator pump, by the second tunnel quantitative loop, quantitative sampling is carried out to indicator;
When carrying out illumination to the mixed solution of seawater sample and indicator and detecting, control T-valve group and form single closed loop stream, described two-way quantitative loop is connected, form closed circuit, and under the driving of water sample pump or indicator pump, seawater sample and indicator are flowed in closed circuit, fully carries out illumination detection again after mixing.
2. the dim light signal detection device for detecting seawater pH value according to claim 1, is characterized in that: described flow cell is tapered flow cell, is connected in the summit of tapered flow cell and bottom surface in first via quantitative loop; In the side of tapered flow cell, the relative both sides design interface in position, enter three respectively by optical fiber and LED light source and one and go out that fiber coupler is corresponding to be of coupled connections.
3. the dim light signal detection device for detecting seawater pH value according to claim 1, is characterized in that: in described master control system, be provided with primary processor, LED light source driver module, low level light signal acquisition module and pump valve driver module; Described primary processor, after test starts, performs following control procedure:
A, the communication paths of control pump valve driver module to T-valve group adjust, and make first via quantitative loop be connected between seawater sample container and waste liquid pool, the second tunnel quantitative loop is connected between marker container and waste liquid pool;
B, control pump valve driver module start water sample pump and indicator pump respectively, rinse and complete quantitative sampling to the pipeline of two-way quantitative loop;
C, control LED light source driver module start, and driving LED light source luminescent, irradiates seawater sample in flow cell, and control the seawater sample detection signal that low level light signal acquisition module gathers three road photodiodes outputs, line item of going forward side by side;
D, control LED light source driver module are closed;
E, the communication paths of control pump valve driver module to T-valve group adjust, and two-way quantitative loop is connected, forms closed circuit; Then, start water sample pump, drive the seawater sample of quantitative sampling and indicator to flow in closed circuit, after fully mixing, control water sample pump and stop;
F, control LED light source driver module start, and driving LED light source luminescent, irradiates the mixed solution in flow cell, and control the mixed solution detection signal that low level light signal acquisition module gathers three road photodiodes outputs, line item of going forward side by side;
G, according to record seawater sample detection signal and mixed solution detection signal, calculate the pH value of Oceanic Samples.
4. the dim light signal detection device for detecting seawater pH value according to claim 3, it is characterized in that: in described LED light source driver module, be provided with constant current reference source, described constant current reference source is after the enabling signal receiving primary processor output, export steady current to LED light source, driving LED light source transmitting white.
5. the dim light signal detection device for detecting seawater pH value according to claim 3, is characterized in that: in described low level light signal acquisition module, be provided with shaping filter buffer circuit, programmable gain amplifier and A/D converter; Described shaping filter buffer circuit receives the detection signal that three road photodiodes export, after Bing Dui tri-road detection signal carries out isolation and shaping filter process, be sent to programmable gain amplifier to amplify, then be sent to after A/D converter carries out analog to digital conversion, export described primary processor to; Described primary processor output gain is selected to control signal to programmable gain amplifier, regulates the enlargement factor of programmable gain amplifier.
6. the dim light signal detection device for detecting seawater pH value according to claim 3, is characterized in that: in described dim light signal detection device, be also provided with power module, memory module and communication module; Described power module receives powered battery, and to convert different direct supplys to be different electricity consumption load supplyings in device; The detection signal received and result of calculation write memory module are preserved by described primary processor, and result of calculation is uploaded to host computer by communication module.
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