CN208537414U - Optical dissolved oxygen sensor multi-parameter interference compensation corrects system - Google Patents
Optical dissolved oxygen sensor multi-parameter interference compensation corrects system Download PDFInfo
- Publication number
- CN208537414U CN208537414U CN201821081053.0U CN201821081053U CN208537414U CN 208537414 U CN208537414 U CN 208537414U CN 201821081053 U CN201821081053 U CN 201821081053U CN 208537414 U CN208537414 U CN 208537414U
- Authority
- CN
- China
- Prior art keywords
- dissolved oxygen
- oxygen sensor
- correction
- salinity
- pond
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model belongs to dissolved oxygen sensor compensation calibration technique field, disclose optical dissolved oxygen sensor multi-parameter interference compensation correction system, including correction pond, the watertight plug connector, gas access equipment, dissolved oxygen sensor to be corrected, reference dissolved oxygen sensor, sampler, salinity regulating device and the pressure-regulating device that connect with correction pond, salinity regulating device and pressure-regulating device are arranged on watertight plug connector.The technical program is under different water temperatures, salinity and ambient pressure conditions, the mixed gas of different oxygen is successively passed through correction pond, water body is set to obtain multiple dissolved oxygen concentrations, record the phase value of dissolved oxygen sensor to be corrected and the environmental parameter of water body, and water sampling calculates the multi-parameter interference compensation correction coefficient of dissolved oxygen sensor to be corrected with iodometric determination dissolved oxygen standard value, the degree of automation improves, transducer calibration precision, correction accuracy, in situ measurement accuracy are improved, makes sensor that there is the wider scope of application.
Description
Technical field
The utility model belongs to dissolved oxygen sensor compensation calibration technique field, discloses a kind of optical dissolved oxygen sensor
The complicated multi-parameter environmental factor interference compensation of high-precision corrects system.
Background technique
An important composition and control parameter of the dissolved oxygen as the marine eco-environment are to measure seawater quality superiority and inferiority, water
Body is contaminated the important indicator and water body self-purification ability research of degree, marine eco-environment assessment and Marine Sciences are tested
Important evidence.So the concentration of in situ, quick, accurate, stable, simple and direct detection Dissolved Oxygen in Seawater is for marine ecology ring
Border monitoring, the early warning of ecocatas-trophe, the benign development of aquafarm have important value.Currently, dissolved oxygen Winkler is analyzed
Method program is cumbersome, takes time and effort, it is often more important that, it is this non real-time, interrupted detection pattern be difficult to ocean dissolved oxygen into
The effective real-time continuous detection of row.And electrochemical dissolution lambda sensor needs reference electrode, and need to carry out constant speed to detected solution and stir
It mixes, to guarantee rate of the oxygen in water by electrode film；Precision is not high, poor anti jamming capability, draws vulnerable to the interference of electromagnetic field
Signal drift is played, therefore application of the electrochemical dissolution lambda sensor in terms of the dissolved oxygen in-situ monitoring of ocean receives very big limit
System.
Optical dissolved oxygen sensor based on Fluorescence Quenching Principle overcomes the deficiency on traditional dissolved oxygen sensing, has and surveys
Amount accurately and fast, highly selective, high stability, electromagnetism interference and the advantages that can remotely monitor, it can be achieved that the original of dissolved oxygen
The continuous detection in position, is widely used to the fields such as marine eco-environment monitoring, the monitoring of aquaculture water quality.Although optic dissolution
Lambda sensor has higher stability and measurement accuracy compared to electrochemical dissolution lambda sensor, but it is supervised in long-term original position
During survey, due to the influence of the complicated multi-parameter environmental factor such as temperature, salinity, depth, data wander can be led to the problem of,
It needs to carry out environmental factor compensation correction to the measurement data of dissolved oxygen sensor.But compensation correction method used at present is general
For store-through corrected value is inaccurate, calibration cycle is long, correction result cannot keep height in larger dissolved oxygen concentration and standard value
The disadvantages of consistent, important is current bearing calibrations to compensate the data interference of dissolved oxygen sensor just for temperature
Correction, and have ignored the interference compensation correction that salinity and environmental pressure influence sensor.Traditional optical dissolved oxygen sensing
Device temperature-compensating bearing calibration is peg method, i.e. anaerobic water and saturation dissolved oxygen water correction, this method passes through measurement dissolved oxygen
Sensor is in anaerobic water (excessive sodium sulfite and a small amount of divalent cobalt solution is added) and saturation dissolved oxygen water (air continuous bubbling
Method) in dissolved oxygen sensor phase value, itself and oxygen in water calculated value at this temperature are subjected to two o'clock linear fit,
So that dissolved oxygen sensor is corrected, but the notable defect that this method has accuracy not high.And traditional bearing calibration is past
Toward influence of the temperature to sensor measurement data has been only taken into account, the interference of salinity, especially environmental pressure is not mended
Correction is repaid, sensor in situ measurement environment complexity immediate offshore area and high salt error, the dissolution of high concentrtion large size Tidal resuspension are seriously affected
The accuracy of oxygen, to the profile survey of dissolved oxygen, there is also biggish errors.For promote optical dissolved oxygen sensor application and
Development promotes the business monitoring capability of China's dissolved oxygen, the quality of data of ocean dissolved oxygen in-situ monitoring, dissolved oxygen is promoted to pass
The application and development of sensor are the gauging calibration work providing method foundation of China's optical dissolved oxygen sensor.It is therefore proposed that one
Kind of optical dissolved oxygen sensor complexity multi-parameter environmental factor interference compensation high-precision correction system and bearing calibration are that have very much must
It wants.
Utility model content
The purpose of this utility model is that in view of the above technical problems, existing dissolved oxygen sensor environmental factor is overcome to compensate
Bearing calibration scalar period is long, standard value is inaccurate, environmental factor correction is single, correcting algorithm model is inaccurate, correction
As a result the prominent questions such as temperature change sea area, the complex sea area that the variation of multi-parameter environmental factor can not be suitable for are only applicable to, are mentioned
For a kind of compensation correction system based on temperature, salinity, depth and Dissolved Oxygen concentration Control device and the multi-parameter ring to match
Border compensation factors bearing calibration, can make to correct calibrated dissolved oxygen sensor and significantly improve prison in situ using this method and device
The accuracy of survey especially can be suitably used for the in-situ monitoring of multi-parameter environmental factor acute variation complex sea area dissolved oxygen.
Used technical solution is as follows to solve above-mentioned technical problem:
A kind of novel dissolved oxygen sensor complexity multi-parameter environmental factor compensation correction method and correction system, correction are provided
System includes with water temperature control device low temperature thermostat bath, the caliberating device with agitating function, oxygen cylinder, nitrogen cylinder, two decompressions
Valve, three mass flow controllers, the salinity regulating device popped one's head in high-precision temperature and salinity, with the pressure of high-precision pressure gauge
Apparatus for adjusting force, safety valve, dissolved oxygen sensor to be corrected and reference dissolved oxygen sensor；Built in correction pond with agitating function
Ultrapure water is filled in air-blowing air stone, inside, and corrects pond and be integrally placed in band water temperature control device low temperature thermostat bath；It corrects on pond
Equipped with gas access, gas vent and sample tap, gas vent connection safety valve；Nitrogen cylinder and oxygen cylinder pass through respectively pipeline according to
It is secondary to be connected to air-blowing air stone by pressure reducing valve, mass flow controller, gas discrepancy；It corrects pond and is equipped with salinity regulating device
Water body is connected by top opening with pressure-regulating device；Dissolved oxygen sensor and reference dissolved oxygen sensor to be corrected passes through school
Positive pond top opening immerses in the water body in standard set-up.
Correction pond is the cylindrical barrel tank body made of pressure-resistant corrosion resistant thermally conductive good material, and gas is reserved on bung
Entrance, gas vent and sample tap, entrance of the gas access as gaseous mixture, gas vent when gas vent is as air-blowing,
Connection safety valve is automatically closed after air-blowing, water sampling mouth when sample tap is sampled as iodimetric titration；Band water temperature control device
Low temperature thermostat bath be provided simultaneously with heating and refrigerating function, can to correction pond in water temperature accurately be controlled, correction pond
Interior reference dissolved oxygen sensor is used to monitor the variation of Dissolved Oxygen in Water sensor when air-blowing, makes to correct molten in water body inside pond
The concentration for solving lambda sensor is stablized near setting value, does not need accurately to monitor dissolved oxygen concentration；Correct the salinity tune at the top of pond
Regulating device and pressure-regulating device can accurately control the salinity and ambient value of water body.Correct the gas safety valve at the top of pond
Correction pond can be closed, internal water body is controlled and is exchanged with the gas-liquid of outside air.Safety valve avoids correcting inside pond under air-blowing state
Pressure is excessive, while correction pond inside water body can be prevented to carry out gas-liquid with outside air and exchanged in the state of stopping ventilation,
Dissolved Oxygen in Water concentration is influenced to stablize.
Optical dissolved oxygen sensor complexity multi-parameter environmental factor compensation correction method, includes the following steps:
(1) correction pond is filled into ultrapure water, and correction pond is integrally placed in low temperature thermostat bath, setting temperature is 0~35
DEG C some numerical value；
(2) etc. temperature is stablized in pond to be corrected, passes through the gas that mass flow controller adjusts oxygen cylinder and High Purity Nitrogen gas cylinder
Body flow proportional will successively match different combination gas and be passed through in correction pond, obtains the water body of multiple dissolved oxygen concentrations；Water body
The saturation degree of dissolved oxygen controls between the dissolved oxygen concentration range of dissolved oxygen sensor practical service environment, need to cover concentration model
The two concentration of the upper and lower bound enclosed；
(3) each dissolved oxygen concentration in pond to be corrected, reference dissolved oxygen sensor indicating value and the dissolved oxygen to be corrected sensing such as
After device signal value stably reaches stabilization, dissolved oxygen sensor phase value to be corrected and water temperature value are recorded.And simultaneously from sampling
Mouth acquisition water sample measures dissolved oxygen as standard value in iodometric analysis method；
(4) the steady temperature setting value of low temperature thermostat bath is successively changed to other 3 temperature, repeated step (2) (3), it is permanent
The range of choice for determining temperature is generally the ambient temperature range of dissolved oxygen sensor actual use, needs to cover the temperature range upper limit
With the two temperature gradients of lower limit；
(5) according to the temperature of water body inside the phase value of the dissolved oxygen sensor to be corrected of correction course record, correction pond
Value and the dissolved oxygen concentration standard value obtained by iodimetric titration, calculate the temperature-compensating correction coefficient of dissolved oxygen sensor to be corrected.
Specific method is:
According under each temperature set-point, the temperature of water body inside the phase value of dissolved oxygen sensor to be corrected, correction pond
Value and the dissolved oxygen concentration standard value obtained by iodimetric titration, obtain fitting formula:
[O2]T=[(a0+a1t+a2t2)/(a3+a4φraw)–1]/(a5+a6t+a7t2+a8t2) (formula 1)
In formula, [O2]TIt for the dissolved oxygen standard value after temperature-compensating correction, is obtained by iodimetric titration, unit is mg L-1,
φrawFor the phase value of dissolved oxygen sensor to be corrected, t is the temperature value for correcting water body inside pond, and unit is DEG C, by the fitting
Formula obtains temperature compensation coefficient a0a1a2a3……a8。
(6) the steady temperature setting value of low temperature thermostat bath is changed to 15 DEG C, saturation dissolved oxygen water is obtained by continuous bubbling method；
(7) by the salinity controling adjustment device at the top of correction pond, change the salt angle value of water body, wait reference in pond to be corrected
After dissolved oxygen sensor indicating value and dissolved oxygen sensor signal value to be corrected stably reach stabilization, different water salinity conditions are recorded
Under correction pond inside water salinity value, temperature value and dissolved oxygen sensor dissolved oxygen indicating value to be corrected, and simultaneously from sampling
Mouth acquisition water sample is using iodometric determination dissolved oxygen as standard value；Salinity compensation can be calculated by following salinity compensation correction formula
Correction coefficient:
[O2]s=[O2]T exp[(S-S0)(b0+b1ts+b2ts 2+b3ts 3)+b4(S2-S0 2)] (formula 2)
In formula, [O2]sFor the dissolved oxygen standard value after temperature creep stress compensation correction, obtained by iodimetric titration, [O2]TIt is same
The dissolved oxygen concentration theoretical value obtained, b are calculated by formula (1) under the conditions of temperature and dissolved oxygen sensor signal value0、b1、b2、
b3、b4For salinity compensative coefficient, S is the present salinity of water body, S0For the salinity before water body, in this bearing calibration, it is denoted as
0, formula (2) can simplify as following formula:
[O2]s=[O2]T exp[S(b0+b1ts+b2ts 2+b3ts 3)+b4 S2] (formula 3)
In formula, tsIt is function related with the temperature value t of water body inside correction pond, can be calculated by following formula:
Ts=ln [(298.15-t)/(273.15+t)] (formula 4)
In formula, t is the temperature value for correcting water body inside pond, and unit is DEG C.
(8) the steady temperature setting value of low temperature thermostat bath is fixed as 15 DEG C, saturation dissolved oxygen is obtained by continuous bubbling method
Water is changed the pressure value of water body, is recorded under different water body pressure conditions by the environmental pressure control device above correction pond
Water body pressure value and dissolved oxygen sensor dissolved oxygen indicating value to be corrected inside caliberating device, it is public can to obtain environmental pressure compensating approach
Formula calculates pressure compensation correction coefficient:
[O2]d=[O2]s+[O2]sPcp (formula 5)
In formula, [O2]dFor the dissolved oxygen standard value after depth compensation correction, [O2]sFor same temperature, salinity and dissolved oxygen
The dissolved oxygen concentration theoretical value obtained is calculated by formula (2) under the conditions of sensor phase value, p is environmental pressure, and unit is
Dbar, cp are environmental pressure penalty coefficient.
(9) by above-mentioned temperature, salinity, environmental pressure rectification building-out method, it is complicated to can get optical dissolved oxygen sensor
Multi-parameter environmental factor compensation correction calculation method:
By the temperature value, salt angle value, ambient value and the dissolved oxygen sensor dissolved oxygen phase to be corrected that record water body
Value can be calculated by following formula and obtain optical dissolved oxygen sensor multi-parameter environmental factor compensating correction value:
[O2]={ [(a0+a1t+a2t2)/(a3+a4φraw)–1]/(a5+a6t+a7t2+a8t2)}(1+pcp)exp[S(b0+
b1ts+b2ts 2+b3ts 3)+b4 S2] (formula 6)
In formula, [O2] be temperature, salinity and environmental pressure compensation correction after dissolved oxygen sensor indicating value.
The water body of multiple dissolved oxygen concentrations refers to the dissolved oxygen according to dissolved oxygen sensor practical service environment in step (2)
Concentration range is at least divided into 6 dissolved oxygen concentrations, and needs two dissolved oxygens of upper and lower bound of dissolved oxygen concentration range
Concentration generally controls the saturation dissolved oxygen in water body 0% to 120%, be averagely divided into 0%, 20%, 40%, 60%,
80%, 100%, 120% this 7 dissolved oxygen concentrations do not need very accurate.
Step (3) is changed using reference dissolved oxygen sensor monitoring Dissolved Oxygen in Water concentration, is controlled Ventilation Rate, is made molten
Solving oxygen concentration variation will not be too fast.It is in running order always to be kept stirring device, contains Dissolved Oxygen in Water inside caliberating device
Amount is kept uniformly, and agitating device speed is unsuitable too fast, otherwise will cause vortex.Dissolved oxygen concentration stops after reaching preset value
It is passed through the mixed gas of different ratio, closes agitating device, and water-gas mixer is made to be maintained at sealing state.Stablize to system
Afterwards, it is ensured that sample position is close with dissolved oxygen sensor probe positions and is in same water layer.
What the range of choice of step (4) low temperature thermostat bath steady temperature setting value should be actually used according to dissolved oxygen sensor
Ambient temperature range is adjusted, and desired temperature needs to cover two temperature gradients of upper and lower bound of ambient temperature range；
0~35 DEG C generally is taken, needs to cover 0 DEG C and 35 DEG C of the two temperature gradients；
With water temperature control device low temperature thermostat bath accurate temperature can be carried out within the scope of -50 DEG C to 80 DEG C very wide temperature
Control, measurement accuracy ± 0.05 DEG C is capable of providing better temperature applicability；Salinity regulating device can be very wide in 0-40 salt
It spends and carries out accurate salinity control in range, depth adjustment can carry out accurate pressure control in very wide pressure limit
System, a whole set of correction system can cover entire temperature, salinity and the pressure limit of dissolved oxygen sensor practical service environment, compare
In existing apparatus, it is capable of providing the correction reference point of more temperature, salinity and adjusting for depth algorithm, can be sensed according to dissolved oxygen
The multi-parameter environmental factor situation of change of device practical service environment, flexible setting dissolved oxygen concentration, temperature spot, salinity point, environment
The quantity of pressure spot and interval, can control the variation of the single environment factor, also can control the common of multi-parameter environmental factor
Variation carries out hybrid compensation correction, effectively control environmental condition, avoids error caused by environment suddenly change, it is ensured that dissolved oxygen
Sensor indicating value can keep the consistent of height with dissolved oxygen standard value within the scope of very big temperature, salinity and environmental pressure.
The technical program is under different water temperatures, salinity and ambient pressure conditions, successively by the mixed of different oxygen
It closes gas and is passed through correction pond, so that water body is obtained multiple dissolved oxygen concentrations, record the phase value and water of dissolved oxygen sensor to be corrected
The environmental parameter of body, and the more ginsengs of complexity that water sampling calculates dissolved oxygen sensor to be corrected with iodometric determination dissolved oxygen standard value
Number environmental factor interference compensation correction coefficient, may be implemented correction while the multi-parameter complex environment factor, the degree of automation mentions
Height improves transducer calibration precision, correction accuracy, in situ measurement accuracy, and sensor is made to have the wider scope of application.
The concentration of dissolved oxygen in correction pond is adjusted by adjusting the mass flow ratio of oxygen and nitrogen, and is taken synchronizing
Dissolved oxygen concentration standard value is obtained using iodimetric titration after sample, with the existing Calculation of Solubility dissolved oxygen standard according to oxygen in water
The method of value is compared with the method for carrying out gas calibration using combination gas, significantly improves the precision of correction；Use 4 temperature
Under the conditions of 20 dissolved oxygen concentrations carry out Sensor Temperature Compensation correction, and the utility model is cooperated to propose new temperature-compensating
Correcting algorithm formula carries out dissolved oxygen sensor temperature-compensating calculating, 5 temperatures above conditions is used compared to existing, more than 60
The method that a dissolved oxygen concentration carries out dissolved oxygen sensor temperature correction, greatly reduces the requirement of correction reference point, significant to contract
Short calibration cycle, simplifies correction course, new algorithmic formula is compared to existing polynomial computation formula, on correction accuracy
There is great promotion, simplifies calculating process, and can protect within the scope of biggish temperature and dissolved oxygen with dissolved oxygen standard value
It holds consistent；By adjusting salinity and pressure condition, the salinity and environmental pressure compensation correction of optical dissolved oxygen sensor are carried out, in fact
Complicated multi-parameter environmental factor compensation correction now comprehensive and systematic to dissolved oxygen sensor, high degree of automation promote sensor
Stated accuracy and correction accuracy improve the accuracy of dissolved oxygen sensor in situ measurement, have sensor and are widely applicable in
Range, the ocean profile for being suitable for the biggish severe sea area of salinity altercation and large-scale river mouth and environmental pressure acute variation are molten
Solve the monitoring of oxygen concentration.
Detailed description of the invention
Fig. 1: the utility model optical dissolved oxygen sensor multi-parameter interference compensation corrects system construction drawing.
Wherein: 1. low temperature thermostat baths；2. correcting pond；3. oxygen cylinder；4. nitrogen cylinder；5. pressure reducing valve；6. mass flow controls
Device；7. salinity regulating device；8. pressure-regulating device；9. safety valve；10. dissolved oxygen sensor to be corrected；11. reference dissolved oxygen
Sensor；12. air-blowing air stone；13. fluid flowmeter；14. sampling bottle；15. conduit；16. sample tap；17. gas vent；
18. gas access；19. watertight plug connector；20. bracket.
Specific embodiment
Below in conjunction with specification drawings and specific embodiments, the utility model is described in further detail.
As shown in Figure 1, optical dissolved oxygen sensor corrects system in the utility model, including with the low of water temperature control device
Warm thermostat 1, the correction pond 2 with agitating function, oxygen cylinder 3, the mass flow controller of pressure reducing valve 5, three of nitrogen cylinder 4, two
6, the salinity regulating device 7 with high-precision temperature and salinity probe, pressure-regulating device 8, safety valve with high-precision pressure gauge
9, dissolved oxygen sensor 10 to be corrected, reference dissolved oxygen sensor 11, air-blowing air stone 12, fluid flowmeter 13, sampling bottle 14.
Wherein, correction pond 2 is cylinder made of 316 stainless steel materials good heating conduction, high pressure resistant, corrosion resistant
Ultrapure water is filled in tubbiness tank body, inside；The watertight for facilitating External Internal pipeline to connect with electric wire is reserved at the top of correction pond 2 to connect
Plug-in unit, correction pond are integrally placed in the low temperature thermostat bath 1 with water temperature control device；Dissolved oxygen sensor 10 and reference to be corrected are molten
It solves lambda sensor 11 and is immersed in the water body in correction pond by correction 2 top opening of pond, be fixed on water body center position by bracket
It sets, and the two position is close and is in same water layer, the latter is used to monitor the concentration of dissolved oxygen in water body；2 are equipped on correction pond
The salinity regulating device 7 popped one's head in high-precision temperature and salinity and the pressure-regulating device 8 with high-precision pressure gauge, the two passes through
It corrects pond top opening and connects water body, for adjusting the salinity and environmental pressure of water body, and record water temperature, salinity and environment
Pressure value, salinity and environmental pressure compensation correction for the bearing calibration calculate；Correction pond is equipped with gas access, gas goes out
Mouth and sample tap, gas vent connection safety valve 9 prevent correction pond internal water for protecting caliberating device to avoid pressure excessive
Body carries out gas-liquid with outside air and exchanges, and sample tap connects dissolved oxygen sensor probe close position water body to sampling by conduit
Bottle is used for iodimetric analysis, determines Dissolved Oxygen in Water concentration standard value；It corrects and places air-blowing air stone 12, nitrogen cylinder inside pond 2
4 and oxygen cylinder 3 successively passes through pressure reducing valve 5 by pipeline respectively, mass flow controller 6, gas access are connected thereto, for increasing
Aerating bubble improves gas-vapor mix efficiency.
Below to the temperature of the optical dissolved oxygen sensor in the utility model, salinity, depth compensation bearing calibration make into
One step explanation, specifically includes the following steps:
Low temperature thermostat bath with water temperature control device is set in 0 DEG C of first temperature value, waits pond to be corrected by step (1)
Interior water temperature reaches setting value and stabilization.
Step (2) is passed through by the three mass flow controllers change being connected to above oxygen cylinder and High Purity Nitrogen gas cylinder
Correct the oxygen in pond and the gas flow ratio of nitrogen, make to correct water body inside pond successively obtain 0%, 20%, 40%, 60%,
80%, 100%, 120%, amount to 7 dissolved oxygen concentrations；
Step (3), it is dense using the dissolved oxygen in reference dissolved oxygen sensor monitoring water body under each dissolved oxygen concentration
Degree, when its measured value reaches near preset value, stopping is passed through mixed gas and closed safe valve, corrects reference dissolved oxygen in pond and passes
After sensor indicating value and dissolved oxygen sensor signal value to be corrected reach stable, temperature value at this time is recorded, is continuously recorded to be corrected
The signal value of dissolved oxygen sensor, number should be no less than 6 times, using its average value as the standard phase of dissolved oxygen sensor to be corrected
Position, while same water layer close positions are in from sample tap by conduit parallel acquisition and dissolved oxygen sensor to be corrected probe
Water sample carries out dissolved oxygen analysis using iodometric analysis method, and number should be no less than 3 times, using its average value as the standard of water sample
Dissolved oxygen value；
Step (4) successively sets 10 DEG C, 25 DEG C and 35 DEG C for the steady temperature of low temperature thermostat bath, repeat step (2) and
Step (3)；
Step (5), under each temperature set-point, the phase value of dissolved oxygen sensor to be corrected corrects water body inside pond
Temperature value and by iodimetric titration obtain dissolved oxygen standard value, calculate dissolved oxygen sensor to be corrected temperature-compensating correction system
Number, calculation method are as follows:
According to dissolved oxygen sensor phase average to be corrected, temperature value and the dissolved oxygen standard value of record, it is fitted
Formula:
[O2]T=[(a0+a1t+a2t2)/(a3+a4φraw)–1]/(a5+a6t+a7t2+a8t2)
In formula, [O2]TIt for the dissolved oxygen standard value after temperature-compensating correction, is obtained by iodimetric titration, unit is mg L-1,
φrawFor the phase value of dissolved oxygen sensor to be calibrated, t is the temperature value of water body inside caliberating device, and unit is DEG C to be intended by this
It closes formula and calculates acquisition temperature-compensating correction coefficient a0、a1、a2、a3、a4、a5、a6、a7、a8。
Low temperature thermostat bath steady temperature with water temperature control device is set in 15 DEG C, waits pool inner water to be corrected by step (6)
Temperature reaches setting value and stabilization, with 1L min-1Flow mixed gas (nitrogen, oxygen ratio is identical with air) is passed through
It corrects ultrapure water inside pond and is aerated 2h or more, dissolved oxygen therein is made to reach saturation, and standing reaches dissolved oxygen for a period of time
Stablize, obtains saturation dissolved oxygen water.
Step (7) changes the amount of reagent that correction water body is added by the salinity regulating device being connected to above correction pond,
Make to correct water body inside pond and successively obtain 5,10,15,20,25,30, amounts to 6 salinity；
Step (8), under each salinity, using the salinity in salinometer monitoring water body, when its measured value reaches preset value,
Stopping is passed through reagent and records temperature value at this time and salt angle value, continuously after dissolved oxygen sensor signal value to be corrected reaches stable
Using no less than 6 times signal values of dissolved oxygen sensor to be corrected measurement, using its average value as dissolved oxygen sensor to be corrected
Normalized phase, while being no less than from sample tap parallel acquisition 3 groups of water sample, carry out dissolved oxygen analysis with iodometric analysis method,
Standard dissolution oxygen value using its average value as water sample；
Step (9), according to dissolved oxygen sensor phase average to be corrected, temperature value, salt angle value and the dissolved oxygen of record
Standard value can get salinity compensation correction formula, calculate the salinity compensative coefficient of dissolved oxygen sensor to be corrected:
[O2]s=[O2]T exp[S(b0+b1ts+b2ts 2+b3ts 3)+b4 S2]
In formula, [O2]sFor the dissolved oxygen standard value after temperature creep stress compensation correction, obtained by iodimetric titration, [O2]TIt is same
The dissolved oxygen concentration theoretical value obtained is calculated by formula (1) under the conditions of temperature and dissolved oxygen sensor signal value, S is existing for water body
Salinity, six linear simultaneous equations can be established according to the formula, solving six linear simultaneous equations can be obtained sensor
Salinity correction factor b0、b1、b2、b3、b4。
Low temperature thermostat bath steady temperature with water temperature control device is set as 15 DEG C, waited in pond to be corrected by step (10)
Water temperature reaches setting value and stabilization, using the method for step (6), obtains saturation dissolved oxygen water；Not from sample tap parallel acquisition
Water sample less than 3 groups, carries out dissolved oxygen analysis with iodometric analysis method, the standard dissolution oxygen value using its average value as water body.
Step (11) changes the pressure of water body inside correction pond by the environmental pressure controling adjustment device at the top of correction pond
Force value makes to correct water body inside pond and successively obtains 0.1MPa, 0.5MPa, 1MPa, amounts to 3 pressure；Under each pressure, use
Pressure gauge monitors the pressure in water body, when its measured value reaches preset value, stops pressurization, dissolved oxygen sensor indicating value to be corrected reaches
To after stabilization, records water body pressure value inside the correction pond under different water body pressure conditions, temperature value, salt angle value and pass through above-mentioned
The calibrated dissolved oxygen sensor dissolved oxygen indicating value of temperature creep stress compensation correction method, according to the Dissolved Oxygen in Water concentration before pressurization
Standard value, water body pressure value and dissolved oxygen sensor indicating value to be calibrated can obtain environmental pressure compensation correction formula, calculate pressure and mend
Repay correction coefficient:
[O2]d=[O2]s+[O2]s pcp
In formula, [O2]dFor the dissolved oxygen standard value after depth compensation correction, [O2]sFor same temperature, salinity and dissolved oxygen
The dissolved oxygen concentration theoretical value obtained is calculated by formula (2) under the conditions of sensor phase value, p is environmental pressure, and unit is
Dbar, cp are environmental pressure penalty coefficient.
Calculating the temperature obtained, salinity, environmental pressure compensative coefficient by the above method can get optical dissolved oxygen
Sensor temperature, salinity, environmental pressure comprehensive compensation correct calculation formula:
[O2]={ [(a0+a1t+a2t2)/(a3+a4φraw)–1]/(a5+a6t+a7t2+a8t2)}(1+pcp)exp[S(b0+
b1ts+b2ts 2+b3ts 3)+b4 S2]
In formula, [O2] be temperature, salinity and environmental pressure compensation correction after dissolved oxygen sensor indicating value, t is temperature, S
For the salinity that water body is present, p is water body pressure；
Optical dissolved oxygen sensor arbitrary temp, salinity, environmental pressure and dissolution in correcting range after corrected
When measuring under oxygen concentration, it need to only pass through temperature value, salt angle value, ambient value and the dissolved oxygen sensor to be corrected of record water body
Dissolved oxygen phase value can obtain optical dissolved oxygen sensor multi-parameter environmental factor compensating correction value by above-mentioned calculation formula.
Embodiment only illustrates the technical solution of the utility model, rather than carries out any restrictions to it；Although referring to aforementioned reality
Example is applied the utility model is described in detail, it for those of ordinary skill in the art, still can be to aforementioned
Technical solution documented by embodiment is modified or equivalent replacement of some of the technical features；And these are modified
Or replacement, the spirit and model of the utility model technical solution claimed that it does not separate the essence of the corresponding technical solution
It encloses.
Claims (10)
1. optical dissolved oxygen sensor multi-parameter interference compensation corrects system, it is characterised in that: connect including correction pond, with correction pond
Watertight plug connector, gas access equipment, dissolved oxygen sensor to be corrected, reference dissolved oxygen sensor, the sampler, salinity connect
Regulating device and pressure-regulating device, salinity regulating device and pressure-regulating device are arranged on watertight plug connector.
2. optical dissolved oxygen sensor multi-parameter interference compensation according to claim 1 corrects system, it is characterised in that:
Dissolved oxygen sensor and reference dissolved oxygen sensor to be corrected is in sustained height.
3. optical dissolved oxygen sensor multi-parameter interference compensation according to claim 2 corrects system, it is characterised in that:
There is salinity regulating device high-precision temperature and salinity to pop one's head in.
4. optical dissolved oxygen sensor multi-parameter interference compensation according to claim 3 corrects system, it is characterised in that:
Pressure-regulating device has high-precision pressure gauge.
5. optical dissolved oxygen sensor multi-parameter interference compensation according to claim 1 to 4 corrects system, feature
Be: sampler includes conduit and sampling bottle, and watertight plug connector is equipped with sample tap, and conduit is passed into correction pond by sample tap
In, port of the conduit in correction pond is identical as dissolved oxygen sensor height to be corrected.
6. optical dissolved oxygen sensor multi-parameter interference compensation according to claim 5 corrects system, it is characterised in that:
Gas access equipment includes oxygen cylinder, nitrogen cylinder and gas pipeline, and the exit of oxygen cylinder and nitrogen cylinder is equipped with pressure reducing valve, gas
Pipeline is equipped with mass-flow control valves, and watertight plug connector is equipped with air inlet, and gas pipeline is passed through in correction pond by air inlet.
7. optical dissolved oxygen sensor multi-parameter interference compensation according to claim 6 corrects system, it is characterised in that:
End of the gas pipeline in correction pond is connected with air-blowing air stone.
8. -4, any optical dissolved oxygen sensor multi-parameter interference compensation correction system of 6-7 according to claim 1,
Be characterized in that: correction pond is arranged in low temperature thermostat bath.
9. optical dissolved oxygen sensor multi-parameter interference compensation according to claim 8 corrects system, it is characterised in that:
Fluid flowmeter is provided on conduit.
10. optical dissolved oxygen sensor multi-parameter interference compensation according to claim 9 corrects system, it is characterised in that:
Dissolved oxygen sensor and reference dissolved oxygen sensor to be corrected passes through bracket and connect with watertight plug connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821081053.0U CN208537414U (en) | 2018-07-09 | 2018-07-09 | Optical dissolved oxygen sensor multi-parameter interference compensation corrects system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821081053.0U CN208537414U (en) | 2018-07-09 | 2018-07-09 | Optical dissolved oxygen sensor multi-parameter interference compensation corrects system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208537414U true CN208537414U (en) | 2019-02-22 |
Family
ID=65388453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821081053.0U Active CN208537414U (en) | 2018-07-09 | 2018-07-09 | Optical dissolved oxygen sensor multi-parameter interference compensation corrects system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208537414U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108663347A (en) * | 2018-07-09 | 2018-10-16 | 山东省科学院海洋仪器仪表研究所 | Optical dissolved oxygen sensor multi-parameter interference compensation corrects system and method |
| CN110426495A (en) * | 2019-09-29 | 2019-11-08 | 江西珉轩智能科技有限公司 | A kind of environmental monitoring method of calibration based on big data |
| CN111044589A (en) * | 2019-12-02 | 2020-04-21 | 河北冀研能源科学技术研究院有限公司 | Preparation method of zero-point correction oxygen-free water for electrodes of online dissolved oxygen meter in thermal power plant |
| CN111272985A (en) * | 2020-03-31 | 2020-06-12 | 武汉美网通科技发展有限公司 | Temperature compensation type high-precision calibration method for soil salinity sensor |
| CN116448972A (en) * | 2023-04-24 | 2023-07-18 | 华南农业大学 | Device and method for detecting dissolved oxygen in water under critical pressure |
-
2018
- 2018-07-09 CN CN201821081053.0U patent/CN208537414U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108663347A (en) * | 2018-07-09 | 2018-10-16 | 山东省科学院海洋仪器仪表研究所 | Optical dissolved oxygen sensor multi-parameter interference compensation corrects system and method |
| CN108663347B (en) * | 2018-07-09 | 2023-09-22 | 山东省科学院海洋仪器仪表研究所 | Multi-parameter interference compensation correction system and method for optical dissolved oxygen sensor |
| CN110426495A (en) * | 2019-09-29 | 2019-11-08 | 江西珉轩智能科技有限公司 | A kind of environmental monitoring method of calibration based on big data |
| CN111044589A (en) * | 2019-12-02 | 2020-04-21 | 河北冀研能源科学技术研究院有限公司 | Preparation method of zero-point correction oxygen-free water for electrodes of online dissolved oxygen meter in thermal power plant |
| CN111272985A (en) * | 2020-03-31 | 2020-06-12 | 武汉美网通科技发展有限公司 | Temperature compensation type high-precision calibration method for soil salinity sensor |
| CN116448972A (en) * | 2023-04-24 | 2023-07-18 | 华南农业大学 | Device and method for detecting dissolved oxygen in water under critical pressure |
| CN116448972B (en) * | 2023-04-24 | 2023-11-24 | 华南农业大学 | Device and method for detecting dissolved oxygen in water under critical pressure |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108663347A (en) | Optical dissolved oxygen sensor multi-parameter interference compensation corrects system and method | |
| CN208537414U (en) | Optical dissolved oxygen sensor multi-parameter interference compensation corrects system | |
| CN107202763B (en) | Temperature salt correction algorithm of optical dissolved oxygen sensor and novel calibration device | |
| CN104515761B (en) | High-precision optical dissolved oxygen sensor calibration method and device | |
| CN108680551B (en) | In-situ self-calibration device and method for optical dissolved oxygen sensor | |
| CN207036693U (en) | A kind of new caliberating device of optical dissolved oxygen sensor | |
| KR20090106431A (en) | System and method for in situ measurements | |
| Kana et al. | Determination of denitrification in the Chesapeake Bay from measurements of N 2 accumulation in bottom water | |
| CN108368471B (en) | Identification of calibration offset for PH measuring devices | |
| CN110687269A (en) | Verification and calibration device for dissolved oxygen tester | |
| US11473042B2 (en) | Monitoring state deviations in bioreactors | |
| CN208795660U (en) | Optical dissolved oxygen sensor original position self-calibrating device | |
| CN208672111U (en) | A kind of method of standard table portable dynamic electromagnetic flowmeter calibrating apparatus | |
| KR101894124B1 (en) | A reactor for determining concentration or mass transfer coefficient of methane in liquid sample and a method for determining concentration or mass transfer coefficient of methane in liquid sample by using the same | |
| CN111239091A (en) | Dissolved oxygen sensor calibration device and calibration method based on fluorescence quenching principle | |
| RU2552598C1 (en) | Device for reproduction and transmission of mass concentration units of oxygen and hydrogen in liquid media | |
| CN204314220U (en) | For the device of optical dissolved oxygen sensor high-precision calibrating | |
| CN108776124A (en) | A kind of optical dissolved oxygen sensor calibrating installation | |
| CN206930558U (en) | A kind of turbidity transducer caliberating device | |
| EP4257956A1 (en) | Method and apparatus for calibrating optical dissolved oxygen sensor | |
| CN207318407U (en) | A kind of parallel reactor Electrode Calibration device | |
| CN104459081B (en) | The assay method of a kind of activated sludge breathing rate and original position breathing rate instrument thereof | |
| TWI649561B (en) | Detection method | |
| JPS5622947A (en) | Analyzer for dissolved oxygen | |
| CN107831203A (en) | A kind of parallel reactor Electrode Calibration device and parallel calibration method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211022 Address after: 266000 No.2 Huiying street, Shanghe demonstration zone, Jiaozhou City, Qingdao City, Shandong Province Patentee after: Qingdao Mihai Technology Co.,Ltd. Address before: 266200, Qingdao, Shandong, Qingdao, Qingdao, the core of the blue Silicon Valley, blue Silicon Valley business center, phase one, building No. 1. Patentee before: INSTITUTE OF OCEANOGRAPHIC INSTRUMENTATION, SHANDONG ACADEMY OF SCIENCES |