CN110702941A - Measuring device and method for sensing characteristics of flow velocity sensor - Google Patents
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- 238000013480 data collection Methods 0.000 claims description 8
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 5
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L magnesium chloride Substances [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 3
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical class Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/08—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring variation of an electric variable directly affected by the flow, e.g. by using dynamo-electric effect
- G01P5/086—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring variation of an electric variable directly affected by the flow, e.g. by using dynamo-electric effect by using special arrangements and constructions for measuring the dynamo-electric effect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P21/00—Testing or calibrating of apparatus or devices covered by the preceding groups
- G01P21/02—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers
- G01P21/025—Testing or calibrating of apparatus or devices covered by the preceding groups of speedometers for measuring speed of fluids; for measuring speed of bodies relative to fluids
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Abstract
The invention discloses a measuring device and a method for sensing characteristics of a flow velocity sensor, wherein the measuring device comprises the flow velocity sensor, a water tank, a motor, a displacement sensor, a signal conditioning circuit, an automatic temperature control heater and a thermometer; the two sides of the top of the water tank are symmetrically provided with a first guide rail, a first sliding block is correspondingly arranged on the first guide rail in a sliding mode, the first sliding block is connected with a second guide rail, the second guide rail is movably connected with a second sliding block, the bottom of the second sliding block is connected with a clamping rod extending into the water tank, the bottom of the clamping rod is provided with a clamp holder used for fixing the flow velocity sensor, and the second sliding block on the second guide rail is driven by a motor; the deformation of the tip of the flow velocity sensor material is detected and recorded by a displacement sensor; an automatic temperature control heater and a thermometer are arranged in the water tank; the signal lead of the flow sensor is connected to a signal conditioning circuit for measuring the potential difference generated across the flow sensor material.
Description
Technical Field
The invention relates to the technical field of flow velocity testing technology and sensor detection, in particular to a system and a method for testing the sensing characteristics of a novel flow velocity sensor based on IPMC (Ion-exchange polymer metal composite).
Background
IPMC is a kind of electroactive polymer material called as 'artificial muscle', its structure is similar to a 'sandwich' form, in which there is a layer of ion exchange membrane, the ion exchange membrane contains metal cation and solvent molecule, through the manufacturing process of chemical plating, the noble metal such as gold/platinum is plated on the two surfaces of the ion exchange membrane, so that the two surfaces outside the ion exchange membrane are respectively attached with a layer of metal electrode.
IPMC materials have excellent sensing capabilities and exhibit direct electromechanical effects, where a force or deformation applied to the IPMC material produces a detectable electrical signal between two electrodes outside the ion-exchange membrane. Aiming at the inherent sensing characteristics of the IPMC material, a novel flow velocity sensor made of the IPMC material is proposed before, but the environment of the sensor in experimental design is ideal, the ocean current situation in real ocean is very complex, the influence of uncontrollable factors is solved, the ocean current motion in ocean and the complex environment conditions are simulated really, so that the sensing characteristics of the flow velocity sensor are reflected really, and a good means is not provided at present, so that a test system and a method for designing and perfecting the sensing characteristics of the relevant flow velocity sensor have a vital significance for the practical development and performance optimization of the novel flow velocity sensor.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a device and a method for measuring the sensing characteristic of a flow velocity sensor, so that the actual ocean current movement can be simulated really in an experiment, and Na contained in seawater can be observed by adopting a controlled variable method+、K+、Ca2+、Mg2+、Cl-The flow speed of various ions and seawater and the different influences on the sensing characteristics of the flow velocity sensor under different simulated seawater temperatures in different regions. The method simplifies the testing process of the sensing characteristics of the flow velocity sensor, can quickly obtain the testing result and the comprehensive analysis result, and enhances the reliability of the testing result.
The purpose of the invention is realized by the following technical scheme:
a measuring device for the sensing characteristics of a flow velocity sensor comprises the flow velocity sensor, a water tank, a motor, a displacement sensor, a signal conditioning circuit, an automatic temperature control heater and a thermometer;
the two sides of the top of the water tank are symmetrically provided with a first guide rail, a first sliding block is correspondingly arranged on the first guide rail in a sliding manner, the first sliding block is connected with a second guide rail, the second guide rail is movably connected with a second sliding block, the bottom of the second sliding block is connected with a clamping rod extending into the water tank, the bottom of the clamping rod is provided with a clamp holder used for fixing the flow velocity sensor, and the second sliding block on the second guide rail is driven by the motor;
the deformation of the tip of the flow velocity sensor material is detected and recorded by the displacement sensor; the automatic temperature control heater and the thermometer are arranged in the water tank;
and a signal lead of the flow velocity sensor is connected to the signal conditioning circuit and is used for measuring the potential difference generated at two ends of the flow velocity sensor material.
Furthermore, a water tank is formed by containing water in the water tank, chloride is placed in the water tank to change the concentration of various ions in the water tank, and the chloride is measured by a spectrophotometer, an ion chromatograph, an automatic potentiometric titrator and a salinity meter.
Further, the displacement sensor is a laser displacement sensor.
Furthermore, the automatic temperature control heater is immersed in the water pool and used for changing the water temperature in the water pool, and the temperature change is measured by the thermometer.
Furthermore, the signal conditioning circuit is composed of two stages of amplifying circuits, the first stage amplifying circuit is a charge amplifying circuit, the second stage amplifying circuit is a voltage amplifying circuit, the amplitude of output voltage is within the collection range allowed by the signal collection module, the voltage signal output by the signal conditioning circuit is transmitted to the data collection card through a lead, after the voltage signal is collected, the voltage signal is sent to the computer through a USB interface of the data collection card for data processing, and the collected voltage data corresponds to the size of the tip displacement of the flow velocity sensor material measured by the laser displacement sensor.
Furthermore, anti-collision blocks are arranged on the first sliding rail and the second sliding rail.
The other technical scheme is as follows:
a method for measuring the sensing characteristics of a flow sensor comprises the following steps:
(1) a water tank is formed by adding water into the water tank, and the second guide rail is driven by a motor, so that the clamping rod is driven to move along the first guide rail along with the second guide rail; the movement speed of the clamping rod is adjustable and is used for simulating different ocean current speeds;
(2) when the flow velocity sensor moves along the guide rail along with the clamping rod driven by the motor and the sliding block, the tip of the flow velocity sensor generates displacement, and the voltage between the electrodes at the two ends of the inner side and the outer side of the flow velocity sensor is measured through the signal conditioning circuit;
(3) the water temperature in the water tank is changed by the automatic temperature control heater to simulate different seawater temperatures, and the sensing characteristics of the flow velocity sensor at different water temperatures are obtained by measuring the temperature change by the thermometer;
(4) adding NaCl, KCl and CaCl into the water tank2、MgCl2Chlorides of different ions are used for simulating the existence of different ions in seawater, the concentration of various ions is measured by a spectrophotometer, an ion chromatograph, an automatic potentiometric titrator and a salinity meter, and the sensing characteristics of the flow velocity sensor under the influence of different ions are obtained;
(5) and measuring the tip displacement of the flow velocity sensor by adopting a laser displacement sensor, carrying out real-time data acquisition, display and storage on the deformation displacement of the flow velocity sensor and the voltage between electrodes, and using the stored data for subsequent analysis and processing.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the device can make the flow velocity sensor move according to a certain speed through the driving device consisting of the motor, the sliding guide rail and the clamping rod, and simulate the flow of seawater through relative movement, so that the flow velocity sensor generates deformation displacement, and output voltage related to the displacement of the tip of the flow velocity sensor is generated between electrodes at the inner side end and the outer side end of a material of the flow velocity sensor.
2. The water temperature in the water tank is changed by the automatic temperature control heater, and the change of the temperature is measured by the thermometer, so that the sensing characteristics of the flow velocity sensor under different water temperatures can be obtained; and adding NaCl, KCl and CaCl into the water tank2、MgCl2The chlorides of different ions can be used for simulating the existence of different ions in seawater, and the concentration of various ions can be measured by a spectrophotometer, an ion chromatograph, an automatic potentiometric titrator and a salinity meter, so that the sensing characteristics of the flow velocity sensor under the influence of different ions can be obtained.
3. The tip displacement of the flow velocity sensor and the output voltage between the electrodes at the inner side and the outer side of the material of the flow velocity sensor can be measured and obtained through the laser displacement sensor and the signal conditioning circuit, and the data can be acquired, displayed and stored in real time through the data acquisition card and relevant software. The testing device and the method can be applied to the sensing characteristic measurement of the flow velocity sensor under different conditions, and have the advantages of simple structure of the measuring device, high measuring precision and low cost.
Drawings
FIG. 1 is a schematic view of the measurement principle of the measuring device of the present invention;
FIG. 2 is a schematic view of the structure of a clamping rod in the measuring device of the present invention;
FIG. 3 is a schematic view of a driving device of the measuring apparatus according to the present invention;
FIG. 4 is a schematic view of the structure of a water tank in the measuring device of the present invention;
fig. 5 is a schematic view of the overall structure of the measuring apparatus of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the testing principle of the present invention is:
the flow velocity sensor is based on an IPMC material, when the IPMC material generates mechanical deformation under the action of external force and bends towards the direction deviating from the axis, metal cations in an ion exchange membrane in the material correspondingly move, and the original ion distribution condition is changed. As the metal cations move, positive charges are gradually accumulated at one electrode and negative charges are accumulated at the other electrode, so that a potential difference is formed between the two electrodes. The electrical signal between the two electrodes can be measured by an external circuit. By measuring the deformation of the IPMC material under the action of external force and the change of the electric signal between the two electrodes, a relation model between the deformation displacement of the IPMC material and the change of the electric signal between the two electrodes can be established, and the size of the external force for deforming the IPMC material can be measured by utilizing the IPMC material, so that the external related flow velocity information can be measured. Meanwhile, the different influences on the sensing characteristics of the flow velocity sensor under the conditions of various ion concentrations in seawater, the flowing speed of the seawater and different seawater temperatures in different regions are tested by adopting a control variable method.
The specific embodiment of the invention is as follows:
as shown in fig. 2, a clamp 12 is arranged at the bottom of the clamping rod 10, and the upper end of the clamping rod 10 is provided with threads; clamping the flow velocity sensor to be measured on the clamp 12, so that the bottom end of the clamping rod is connected with the substrate of the flow velocity sensor, and a signal lead of the flow velocity sensor is connected to a signal conditioning circuit;
the driving apparatus shown in fig. 3 includes: the anti-collision device comprises an anti-collision block 3, a first guide rail 5, a motor 6, a first sliding block 7, a second sliding block 8 and a second guide rail 11; the lower end of the second sliding block is provided with threads which can be connected with a clamping rod shown in figure 2, the second sliding block 8 is driven by a motor, and the second sliding block 8 is driven by a screw rod, a belt pulley or a gear rack from the motor 6 to the second sliding block 8. The clamping rod is driven by the direct current motor 6, so that the clamping rod can move along the sliding guide rail, and the whole body forms a driving device;
as shown in fig. 4, a water tank is formed by adding water into a water tank 9, and a spectrophotometer, an ion chromatograph, an automatic potentiometric titrator, a salinity meter 1, an automatic temperature control heater 2 and a thermometer 4 are arranged in the water tank; changes of information such as temperature and different ion concentrations can be measured by means of measuring equipment such as a spectrophotometer, an ion chromatograph, an automatic potentiometric titrator, a salinity meter, a thermometer and the like;
the overall driving device shown in fig. 3 is arranged on the water tank shown in fig. 4, which is an overall structure diagram of the sensing characteristic measuring device of the flow rate sensor provided by the invention shown in fig. 5;
the data of different ocean current speeds, different seawater temperatures and various medium ion concentrations can be respectively obtained by controlling the movement speed, changing the water temperature, adding chloride and the like of the device for future analysis.
The main functions of the testing device provided by the invention comprise:
the clamping rod can move along the sliding guide rail under the driving of the direct current motor, the movement speed is adjustable, and the clamping rod is used for simulating different ocean current speeds and acquiring the sensing characteristics of the flow velocity sensor at different flow velocities;
the water temperature in the water tank can be changed through the automatic temperature control heater, and the automatic temperature control heater is used for simulating different seawater temperatures and acquiring the sensing characteristics of the flow velocity sensor at different water temperatures;
the method can be used for simulating the existence of different ions in the seawater by adding chlorides of different ions into the water tank, so as to obtain the sensing characteristics of the flow velocity sensor under the influence of different ion concentrations; the signal conditioning circuit is composed of two stages of amplifying circuits, the first stage amplifying circuit is a charge amplifying circuit, the second stage amplifying circuit is a voltage amplifying circuit, the amplitude of output voltage is enabled to be within the collection range allowed by the signal collection module, voltage signals output by the signal conditioning circuit are transmitted to the data collection card through a lead, the voltage signals are collected by the data collection card and then sent to a computer through a USB interface of the data collection card for data processing, and the collected voltage data correspond to the displacement of the tip end of the flow velocity sensor material measured by the laser displacement sensor. In this embodiment, one end of the data acquisition card is connected to the signal conditioning circuit through a wire, and is configured to acquire a voltage signal output by the signal conditioning circuit; the other end of the data acquisition card is connected with a computer through a USB interface.
And carrying out real-time data acquisition, display and storage on the deformation displacement of the IPMC material tip and the voltage between the two electrodes, wherein the stored data is used for subsequent analysis and processing.
The present invention is not limited to the above-described embodiments. The foregoing description of the specific embodiments is intended to describe and illustrate the technical solutions of the present invention, and the above specific embodiments are merely illustrative and not restrictive. Those skilled in the art can make many changes and modifications to the invention without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. A measuring device for the sensing characteristic of a flow velocity sensor is characterized by comprising the flow velocity sensor, a water tank, a motor, a displacement sensor, a signal conditioning circuit, an automatic temperature control heater and a thermometer;
the two sides of the top of the water tank are symmetrically provided with a first guide rail, a first sliding block is correspondingly arranged on the first guide rail in a sliding manner, the first sliding block is connected with a second guide rail, the second guide rail is movably connected with a second sliding block, the bottom of the second sliding block is connected with a clamping rod extending into the water tank, the bottom of the clamping rod is provided with a clamp holder used for fixing the flow velocity sensor, and the second sliding block on the second guide rail is driven by the motor;
the deformation of the tip of the flow velocity sensor material is detected and recorded by the displacement sensor; the automatic temperature control heater and the thermometer are arranged in the water tank;
and a signal lead of the flow velocity sensor is connected to the signal conditioning circuit and is used for measuring the potential difference generated at two ends of the flow velocity sensor material.
2. The apparatus of claim 1, wherein the water tank contains water to form a pool, and chloride is contained in the pool to change the concentration of various ions in the pool, and the chloride is measured by a spectrophotometer, an ion chromatograph, an automatic potentiometric titrator, and a salinity meter.
3. A device for measuring the sensing characteristics of a flow rate sensor as recited in claim 1, wherein said displacement sensor is a laser displacement sensor.
4. The apparatus for measuring the sensing characteristics of a flow rate sensor according to claim 2, wherein the automatic temperature control heater is immersed in the water bath for changing the temperature of the water in the water bath, and the temperature change is measured by means of a thermometer.
5. The device for measuring the sensing characteristics of a flow velocity sensor according to claim 1, wherein the signal conditioning circuit is composed of a two-stage amplifier circuit, the first stage amplifier circuit is a charge amplifier circuit, the second stage amplifier circuit is a voltage amplifier circuit, so that the amplitude of the output voltage is within the collection range allowed by the signal collection module, the voltage signal output by the signal conditioning circuit is transmitted to the data collection card through a wire, the voltage signal is collected by the data collection card and then sent to the computer through a USB interface of the data collection card for data processing, and the collected voltage data corresponds to the displacement of the tip of the flow velocity sensor material measured by the laser displacement sensor.
6. The device for measuring the sensing characteristics of the flow rate sensor according to claim 1, wherein the first slide rail and the second slide rail are both provided with anti-collision blocks.
7. A method for measuring a sensing characteristic of a flow rate sensor according to claim 1, comprising the steps of:
(1) a water tank is formed by adding water into the water tank, and the second guide rail is driven by a motor, so that the clamping rod is driven to move along the first guide rail along with the second guide rail; the movement speed of the clamping rod is adjustable and is used for simulating different ocean current speeds;
(2) when the flow velocity sensor moves along the guide rail along with the clamping rod driven by the motor and the sliding block, the tip of the flow velocity sensor generates displacement, and the voltage between the electrodes at the two ends of the inner side and the outer side of the flow velocity sensor is measured through the signal conditioning circuit;
(3) the water temperature in the water tank is changed by the automatic temperature control heater to simulate different seawater temperatures, and the sensing characteristics of the flow velocity sensor at different water temperatures are obtained by measuring the temperature change by the thermometer;
(4) adding NaCl, KCl and CaCl into the water tank2、MgCl2Chlorides of different ions are used for simulating the existence of different ions in seawater, the concentration of various ions is measured by a spectrophotometer, an ion chromatograph, an automatic potentiometric titrator and a salinity meter, and the sensing characteristics of the flow velocity sensor under the influence of different ions are obtained;
(5) and measuring the tip displacement of the flow velocity sensor by adopting a laser displacement sensor, carrying out real-time data acquisition, display and storage on the deformation displacement of the flow velocity sensor and the voltage between electrodes, and using the stored data for subsequent analysis and processing.
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