CN113311050A - Medical quick zirconia oxygen sensor - Google Patents
Medical quick zirconia oxygen sensor Download PDFInfo
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- CN113311050A CN113311050A CN202110542186.3A CN202110542186A CN113311050A CN 113311050 A CN113311050 A CN 113311050A CN 202110542186 A CN202110542186 A CN 202110542186A CN 113311050 A CN113311050 A CN 113311050A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/417—Systems using cells, i.e. more than one cell and probes with solid electrolytes
- G01N27/419—Measuring voltages or currents with a combination of oxygen pumping cells and oxygen concentration cells
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
- G05D23/22—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element being a thermocouple
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- Measuring Oxygen Concentration In Cells (AREA)
Abstract
The invention discloses a medical rapid zirconia oxygen sensor and a temperature control unit thereof, which mainly uses zirconia materials and platinum electrodes to form an oxygen concentration high-speed response sensing unit, designs a symmetrical sensing and gas inlet structure, ensures that reference gas and measured gas symmetrically pass through a sensing unit, and designs a sensing unit heating and temperature control method in a matching way, thereby realizing rapid and accurate acquisition of the oxygen concentration in the gas.
Description
Technical Field
The invention relates to the field of oxygen sensors, in particular to a medical rapid zirconia oxygen sensor.
Background
The zirconia oxygen sensor takes stable zirconia as a sensitive material, generates holes by ionizing oxygen ions at high temperature (above 650 ℃), oxygen ions containing oxygen pass through the holes, the oxygen ions migrate and generate potential difference, and leads at two ends of a platinum electrode can detect voltage, so that the measurement of oxygen concentration is realized.
The early oxygen sensor is mainly used for automobiles, and mainly detects the content of oxygen in automobile exhaust so as to realize oil injection control. The automobile can generate heat to meet the working condition of the sensor in the driving process, so that the whole sensor can work without additionally increasing a high-temperature heating environment.
Along with the development of the medical industry, the demand of oxygen concentration detection on the aspect of medical health is also increasing, but the existing liquid electrochemistry, ultrasonic and other types of oxygen sensors have the defects of short service life, slow response speed and the like, and because the zirconia oxygen sensor has long service life and high response speed, the zirconia oxygen sensor is very suitable for the real-time monitoring of the oxygen concentration in the medical health, but the zirconia oxygen sensor needs a high-temperature working environment, and the measurement precision can be influenced by the temperature change, so a high-performance constant temperature control unit is needed to ensure the normal work of the zirconia oxygen sensor.
Disclosure of Invention
In view of this, the present invention provides a novel medical rapid zirconia oxygen sensor and a temperature control unit thereof.
The technical scheme adopted by the invention is as follows:
a medical rapid zirconia oxygen sensor comprises a sensing unit and a temperature control unit; the sensing unit comprises a platinum electrode 2 and a zirconia solid electrolyte zirconia disc 1. A zirconia disc made of a stable zirconia material, and porous platinum electrodes 2 are symmetrically generated on the left side and the right side of the zirconia disc, and the ceramic tube is divided into two chambers by the sensing unit; the platinum electrode output lead 7 is led out through the alumina tube 4 and is sealed by the sealing ceramic 3. The sensor airway is symmetrical. The gas can smoothly enter and exit.
Furthermore, the air passages are symmetrical, namely the effective contact surfaces of the left air chamber, the right air chamber, the sensitive unit and the like are symmetrical by taking the zirconia disc as the center.
Furthermore, the smooth gas inlet and outlet means that the analysis gas passes through the gas inlet pipe and then directly reaches the sensing unit, and is rapidly discharged after contacting the sensing unit, so that no dead space exists, and the gas cannot remain in the area.
Further, the temperature control unit comprises a thermocouple 16, a snake-shaped heating wire 17 and a circuit module, the temperature of the heating area 6 of the ceramic tube is detected through the thermocouple 16, the snake-shaped heating wire 17 is wound on the outer side of the ceramic tube 5 for heating, and the circuit module detects real-time temperature and controls heating power.
Further, the temperature of the heating area 6 of the ceramic tube is detected through a thermocouple 16, the thermocouple is thermally bonded outside the middle position of the ceramic tube 5, and the environment temperature compensation is carried out through a platinum resistor; thereby accurately calculating the temperature of the heating zone of the sensor.
Furthermore, the snake-shaped heating wire is wound on the outer side of the ceramic tube, the snake-shaped heating wire is uniformly wound on the outer side of the ceramic tube, and the length of a coverage area of the heating wire is more than three times of the length of an area of the sensing unit; the temperature of the sensing unit is uniform, and the inlet gas is effectively preheated.
Furthermore, the circuit module detects real-time temperature and controls heating power, wherein the circuit module comprises a temperature measuring circuit, a silicon controlled trigger circuit, a temperature heating circuit and a main control chip MCU, the temperature measuring circuit inputs signals into the MCU, the MCU calculates the temperature of a heating area, compares the temperature with a set target temperature and calculates and controls the trigger circuit to conduct heating time; thereby realizing constant temperature feedback control.
The invention has the following beneficial advantages:
(1) the sensors are symmetrically designed, the resistance is the same, and the contact area of the sensitive units and the gas is the same, so that when gas with the same pressure enters and exits, the zero-point signal of the system is smaller, and the signal can be directly amplified conveniently.
(2) The smooth gas circulation makes, and gas is bounce-back few in the intracavity, and the signal noise is low, and the degree of accuracy is high, simultaneously because gas retention time is short for sensor response time is short, and the response is rapid.
(3) The measuring method of the thermocouple is adopted, the position is arranged outside the central position of the sensing unit, the temperature detection is reliable, and the temperature of the heating area is accurately measured through environment temperature compensation.
(4) The snakelike heating wire winding mode for the heating is even, and the temperature is even in the sensing unit.
(5) The control part controls the conduction angle of the controlled silicon to control the heating time through a feedback method, the control process is mild and has small oscillation, and a closed loop is formed, so that the whole temperature is accurately controlled.
Drawings
FIG. 1 is a schematic diagram of the sensor structure of the present invention;
FIG. 2 is a diagram of the thermocouple and heater wire winding of the present invention;
FIG. 3 is a schematic diagram of the temperature measurement circuit of the present invention;
FIG. 4 is a schematic diagram of the thyristor trigger circuit of the present invention;
FIG. 5 is a schematic diagram of the temperature heating circuit of the present invention;
fig. 6 is a flow chart of the temperature control of the present invention.
In the figure, 1 zirconia plate, 2 platinum electrode, 3 sealing ceramic, 4 alumina tube, 5 ceramic tube, 6 heating zone, 7 output lead wire, 8 inlet tube, 9 sample gas end, 10 reference gas end, 11 sample gas inlet, 12 reference gas inlet, 13 sample gas outlet, 14 reference gas outlet, 15 detection cavity, 16 thermocouple, 17 serpentine heater strip.
Detailed Description
For the sake of clarity and completeness of the technical solution in the embodiment of the present invention, the present invention will be described in detail with reference to fig. 1 to 6. Mainly relates to a circuit diagram design of a heating, measuring and controlling system which is designed by a symmetrical structure of a sensor, smooth gas inlet and outlet, winding of a thermocouple and a heating wire and temperature. The device comprises a zirconia plate 1, a platinum electrode 2, sealing ceramic 3, an alumina tube 4, a ceramic tube 5, a heating zone 6, an output lead 7, an air inlet tube 8, a sample gas end 9, a reference gas end 10, a sample gas inlet 11, a reference gas inlet 12, a sample gas outlet 13, a reference gas outlet 14, a detection cavity 15, a thermocouple 16 and a serpentine heater strip 17.
The sensor comprises a sensing unit and a temperature control unit.
As shown in fig. 1, the sensing unit comprises a platinum electrode 2 and a zirconia solid electrolyte zirconia disc 1. A zirconia disc 1 made of stable zirconia material, porous platinum electrodes 2 are symmetrically generated at the left side and the right side of the zirconia disc 1, and the ceramic tube is divided into two chambers by the sensing unit; an output lead 7 of the platinum electrode 2 is led out through the alumina tube 4 and is sealed by sealing ceramics 3. The sensor airway is symmetrical, and the gas inlet and outlet are smooth. The air passages are symmetrical, namely the effective contact surfaces of the left air chamber, the right air chamber, the sensitive unit and the like are symmetrical by taking the zirconia disc 1 as a center. The gas smoothly enters and exits, namely the analyzed gas passes through the gas inlet pipe and then directly reaches the sensing unit, and is rapidly discharged after contacting the sensing unit, so that no dead space exists, and the gas cannot be remained in the area.
The whole sensor adopts a bilateral symmetry design, as shown in figure 1, the center is the middle zirconia disc 1, the air inlet and outlet lengths at two ends and the size of the internal space are consistent, and the purpose of the design is to reduce the measurement error. The ceramic tube 5 is made of zirconia ceramic material, and has the following size design, the length is 30mm, the thickness is 1mm, the diameter is 6mm, and the thickness of the middle zirconia disc 1 is 0.5 mm. The zirconia disk 1 is zirconia-doped yttria electrolyte, and the activity of the zirconia disk is much higher than that of single zirconia. The joint of the alumina tube 4 and the ceramic tube 5 adopts a sealing ceramic material, and the thermal expansion coefficient of the material is consistent with that of the ceramic in the sealing, so that rigid connection is avoided.
The gas inlet pipe 8 is designed to ensure smooth gas inlet and outlet, and as shown in fig. 1, the reference gas end 10 and the sample gas end 9 are partially designed to be consistent. The gas inlet pipe 8 is made of 3mm metal, penetrates through the detection cavity 15 in the middle to reach the ceramic pipe 5, extends into the ceramic pipe 5, can be but is not limited to 10mm, gas flows out of the gas inlet pipe 8 to reach the middle sensing unit, and is rapidly dispersed to the periphery, and then flows out from the sample gas outlet 13 or the reference gas outlet 14 above two sides of the detection cavity 15, so that residual gas is prevented from staying in the cavity for a long time.
As shown in fig. 2, the temperature control unit comprises a thermocouple 16, a serpentine heater 17 and a circuit module, the thermocouple 16 detects the temperature of the heating area of the ceramic tube, the serpentine heater 17 is wound on the outer side of the ceramic tube for heating, and the circuit module detects the real-time temperature and controls the heating power. The thermocouple hot junction is located the outside of ceramic tube intermediate position to carry out ambient temperature compensation through platinum resistance, thereby the temperature of accurate calculation sensor heating zone.
The snake-shaped heating wire 17 is uniformly wound on the outer side of the ceramic tube 5, and the length of the coverage area of the heating wire is more than three times of the length of the area of the sensing unit, so that the temperature of the sensing unit is uniform, and the entering gas is effectively preheated.
The thermocouple 16 and the snake-shaped heating wire 17 are wound, as shown in figure 2, the alumina tube 4 is slightly shorter than the ceramic tube 5, each is assembled side by side to form a tube shape, the ceramic tube 5 is wrapped, the snake-shaped heating wire 17 respectively penetrates through the inside of the alumina tube 4 and wraps the ceramic tube 5 to enable the alumina tube 5 to be heated uniformly, one alumina tube 4 is reserved, the thermocouple 16 is installed, the connection point is located at the center of the zirconia plate 1, and the measured temperature can represent the temperature of a heating area.
The circuit module detects real-time temperature and controls heating power, wherein the circuit module comprises a temperature measuring circuit, a silicon controlled trigger circuit, a temperature heating circuit and a main control chip MCU, the temperature measuring circuit inputs signals into the MCU, the MCU calculates the temperature of a heating area, compares the temperature with a set target temperature, and calculates and controls the trigger circuit to conduct heating time, thereby realizing constant temperature feedback control.
The principle of the temperature measuring circuit is that a junction is placed in the heating area 6 and used for detecting the temperature difference between the heating area 6 and the environment, the thermistor is located in the circuit module and used for measuring the environment temperature, when the temperature is different, a potential difference is generated, the AD7793 receives the thermocouple detected temperature difference and the thermistor detected environment temperature, the temperature of the heating area 6 is the sum of the thermocouple detected temperature difference and the platinum resistor detected environment temperature, and the measured temperature result is processed by an internal analog microcontroller of the AD7793 and converted into a digital signal to be transmitted to the outside through an interface.
The principle diagrams of silicon controlled rectifier triggering and temperature heating are shown in fig. 4 and 5, a special chip TCA789 for a triggering circuit is mainly adopted, N1 and N2 are VMOS tubes, T1 and T2 are two unidirectional reverse parallel silicon controlled rectifiers at the rear end controlled by an isolation transformer, the two unidirectional reverse parallel silicon controlled rectifiers are respectively conducted at the positive end and the negative end of a power supply in turn, the voltage at the two ends of a heater is controlled by the conduction angle of the silicon controlled rectifiers, when the conduction angle is increased, the voltage at the two ends is reduced, the heating power is reduced, the temperature is reduced, otherwise, the temperature is increased, and the power or the temperature of the heater can be adjusted.
A temperature control flow chart, as shown in fig. 6, the preceding stage changes the voltage into the available voltage, controls the heating power of the heater through the conduction angle of the thyristor, receives the thermocouple detection temperature difference and the thermistor detection environment temperature through the AD7793, calculates the temperature of the heating area, inputs the obtained heating area temperature signal and the set temperature signal into the software together, calculates the conduction angle and outputs the conduction angle, transmits the conduction angle signal to the trigger circuit, and finally adjusts the thyristor, thereby realizing the adjustment of the temperature, forming the closed-loop control, and precisely controlling the temperature.
The specific using method of the sensor comprises the following steps:
firstly, symmetrically introducing a sample gas outlet 13 and a reference gas outlet 14 into a vacuum air pump through two sections of temperature-resistant gas pipes, and ensuring that the pumping pressure of the air pump on two paths of gas is equal to the greatest extent;
secondly, connecting a reference gas inlet 12 to standard reference gas with known concentration through a temperature-resistant gas pipe by an adjustable throttle valve, connecting a sample gas inlet 11 to a gas part to be detected through the temperature-resistant gas pipe by the adjustable throttle valve, adjusting the flow rates of the gas on two sides to be as close as possible by adjusting the throttle valves on the two sides, wherein the flow rate difference does not exceed 30 milliliters per minute, and the flow rate range is generally within 50-400 milliliters per minute;
the power supply of the temperature control unit is supplied, the temperature control unit can automatically heat according to the set temperature, and the temperature of the sensor reaches a stable state through the preheating time of several minutes;
therefore, a corresponding voltage signal is output on the platinum electrode output lead according to the difference value between the gas concentration of the part to be measured and the reference gas concentration, and the oxygen concentration of the part to be measured can be rapidly measured through subsequent amplification and detection of the type.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and the preferred embodiments are not exhaustive and do not limit the invention to the precise embodiments described. Various modifications and improvements of the technical solution of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solution of the present invention is to be covered by the protection scope defined by the claims.
Claims (7)
1. A medical quick zirconia oxygen sensor which is characterized in that: the sensor comprises a sensing unit and a temperature control unit; the sensing unit comprises a platinum electrode (2) and a zirconia disc (1) of zirconia solid electrolyte; a zirconia disc made of stable zirconia material, porous platinum electrodes (2) are symmetrically generated at the left side and the right side of the zirconia disc, and the ceramic tube is divided into two chambers by the sensing unit; a platinum electrode output lead (7) is led out through an alumina tube (4) and is sealed by adopting sealing ceramics (3); the sensor airway is symmetrical.
2. The sensor of claim 1, wherein: the air passages are symmetrical, and the effective contact surfaces of the left air chamber, the right air chamber and the sensitive unit are symmetrical by taking the zirconia disc as the center.
3. The sensor of claim 1, wherein: the analysis gas passes through the gas inlet pipe and then directly reaches the sensing unit, and is discharged after contacting the sensing unit, so that no dead space exists.
4. The sensor of claim 1, wherein: the temperature control unit comprises a thermocouple (16), a snake-shaped heating wire (17) and a circuit module, the temperature of the heating area (6) of the ceramic tube is detected through the thermocouple, the snake-shaped heating wire (17) is wound on the outer side of the ceramic tube for heating, and the circuit module detects the real-time temperature and controls the heating power.
5. The sensor of claim 4, wherein: the temperature of the heating area (6) of the ceramic tube is detected through a thermocouple (16), the thermocouple is thermally bonded on the outer side of the middle position of the ceramic tube (5), and environmental temperature compensation is carried out through a platinum resistor.
6. The sensor of claim 4, wherein: the snake-shaped heating wire (17) is wound on the outer side of the ceramic pipe (5) for heating, the snake-shaped heating wire (17) is uniformly wound on the outer side of the ceramic pipe (5), and the length of a coverage area of the heating wire is more than three times that of an area of the sensing unit.
7. The sensor of claim 4, wherein: the circuit module detects real-time temperature and controls heating power, wherein the circuit module comprises a temperature measuring circuit, a silicon controlled trigger circuit, a temperature heating circuit and a main control chip MCU, the temperature measuring circuit inputs signals into the MCU, the MCU calculates the temperature of a heating area, compares the temperature with a set target temperature and calculates and controls the conduction heating time of the trigger circuit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115753887A (en) * | 2022-11-17 | 2023-03-07 | 广州市华粤行医疗科技有限公司 | Trace oxygen detection device, trace oxygen analyzer and trace oxygen detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115753887A (en) * | 2022-11-17 | 2023-03-07 | 广州市华粤行医疗科技有限公司 | Trace oxygen detection device, trace oxygen analyzer and trace oxygen detection method |
| CN115753887B (en) * | 2022-11-17 | 2024-04-09 | 广州市华粤行医疗科技有限公司 | Trace oxygen detection device, trace oxygen analyzer, and trace oxygen detection method |
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| Publication number | Publication date |
|---|---|
| CN113311050B (en) | 2023-07-25 |
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