CN112550724A - Icing detection system and detection method based on impedance measurement - Google Patents
Icing detection system and detection method based on impedance measurement Download PDFInfo
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Abstract
The invention relates to an icing detection system and method based on impedance measurement. The impedance icing detector consists of an impedance electrode and a temperature sensor and is used for detecting the thickness of the ice layer, converting the thickness information and the temperature information of the ice layer into electric signals and providing the electric signals to the icing detection controller. The icing detection controller provides an excitation signal for the impedance icing detector, calculates a temperature signal and an icing signal sent by the impedance icing detector and judges whether the impedance icing detector is in an icing environment or not. The resistive icing probe can be glued to the leading edge of an aircraft wing with its surface resistive electrode in direct contact with the ice. The device can be arranged at any position of the outer surface of the wing, and the adaptability of the icing detection system to various different types of machines is improved. Aiming at the existing rapidly developed unmanned aerial vehicle and helicopter, the impedance type icing detection system not only has the advantages of small volume and light weight, but also has the invisibility which the common icing detector does not have.
Description
Technical Field
The invention belongs to the technical field of ice prevention and deicing, and relates to an icing detection system and method based on impedance measurement.
Background
The icing detection system is used as special detection and alarm equipment for detecting whether icing exists on the surface of the airplane when the airplane flies under the icing meteorological condition. The old icing detection device is embedded into the aircraft skin and exposes the probe to carry out icing detection, the mounting position is fixed, the whole set of device has the defect of heavy weight, the exposed probe is made of functional materials, the anti-interference capability is poor, and the materials are easy to damage. And can not meet the stealth requirement of part of the current airplanes.
In order to meet the high requirement of stealth of the aircraft icing detection system, the traditional icing detection device is optimally designed. An impedance type icing detection system is designed and developed by adopting an impedance measurement principle.
Disclosure of Invention
The purpose of the invention is: the icing detection system and method based on impedance measurement have the function of detecting the icing condition on the surface of the skin of the airplane and meet the requirements of the new generation of airplane on the volume, weight and stealth of the sensor. The sensor generates an effective frontal gyroidal icing detection zone by means of electrodes mounted parallel to the surface of the wing. Icing detection can be carried out in a wide range.
The technical scheme of the invention is as follows:
an icing detection system based on impedance measurement comprises an icing detection controller and a plurality of impedance icing detectors, wherein the impedance icing detectors are respectively connected with the icing detection controller, the icing detection controller comprises a driving circuit board (2-1), a signal processing circuit board (2-2) and a filtering power supply circuit board (2-3), the impedance icing detectors comprise temperature sensors (1-2) and impedance electrodes (1-1), the temperature sensors (1-2) are bidirectionally connected with the driving circuit board (2-1), the driving circuit board (2-1) provides voltage signals for the temperature sensors (1-2), the temperature sensors (1-2) provide temperature signals for the driving circuit board (2-1), the impedance electrodes (1-1) are connected with the driving circuit board (21-), and provide impedance signals for the driving circuit board (2-1), the filtering power supply circuit board (2-3) is respectively connected with the driving circuit board (2-1) and the impedance electrode (1-1), an alternating voltage signal is provided for the driving circuit board (2-1), an excitation signal is provided for the impedance electrode (1-1), the driving circuit board (2-1) is connected with the signal processing circuit board (2-2), a driving signal is provided for the signal processing circuit board (2-2), the signal processing circuit board (2-2) is connected with an upper computer, an alarm/fault signal is provided for the upper computer, the upper computer is connected with the filtering power supply circuit board (2-3), an alternating voltage is provided for the filtering power supply circuit board (2-3), the filtering power supply circuit board (2-3) is connected with the signal processing circuit board (2-2), and a power supply voltage signal is provided for the signal processing circuit board (2-2).
Further, the temperature monitoring device comprises impedance electrodes (1-1), temperature sensors (1-2), a supporting shell (1-3) and a socket (1-4), wherein the number of the impedance electrodes (1-1) is even, the impedance electrodes (1-1) are separately arranged on the surface of the supporting shell (1-3), the temperature sensors (1-2) are arranged on the surface of the supporting shell (1-3), and the impedance electrodes (1-1) are connected with the socket (1-4).
Furthermore, the support shell (1-3) is of an arc-shaped structure, the arc-shaped structure comprises an inner concave surface and an outer convex surface, the shape of the inner concave surface is matched with that of the front edge of the airplane wing, and the outer convex surface is provided with a temperature sensor (1-2) and an impedance electrode (1-1).
Further, the temperature sensor (1-2) and the impedance electrode (1-1) are bonded on the outer convex surface through a high-temperature adhesive.
Furthermore, the impedance electrode (1-1) is supported by an inert metal platinum material, and the support shell (1-3) is made of a composite material compatible with the airplane wing.
Furthermore, the structure of the power supply device also comprises a socket (2-4), a base (2-5), a rear cover (2-6), a filtering power supply circuit board (2-3), a signal processing circuit board (2-2) and a driving circuit board (2-1) which are sequentially stacked in the rear cover (2-6) and the base (2-5) through a support column, and the socket (2-4) is arranged on the side part of the rear cover (2-6).
Furthermore, the number of the impedance icing detectors is 2, and the impedance icing detectors are respectively arranged at the front edges of the left wing and the right wing of the airplane.
Further, the driving circuit board (2-1) comprises an impedance measuring module, an impedance adjusting module and a temperature measuring module, wherein the temperature signal and the impedance signal are subjected to signal processing and A/D conversion through the temperature measuring module and the impedance measuring module respectively, the impedance signal and the temperature signal are converted into voltage signals acceptable by a microprocessor on the signal processing circuit board, and the impedance adjusting module adopts a negative feedback adjusting circuit to play a role in eliminating the influence of raindrops or other interferents.
Further, the signal processing circuit board (2-2) comprises a signal processing module and an icing alarm module, the signal processing module is composed of a microprocessor and a peripheral circuit, the signal processing module receives impedance signals and temperature signals and judges whether the impedance type icing detector is in an icing environment or not, the icing alarm module comprises a solid relay and an optical coupler, and icing alarm signals are output to the upper computer through the solid relay and the optical coupler.
The detection method of the icing detection system comprises the following steps:
step 1: the temperature sensor (1-2) receives a direct current voltage signal provided by the driving circuit board (2-1) through a signal, the temperature sensor (1-2) provides (2-1) an atmospheric temperature signal for the driving circuit board, the filtering power supply circuit board (2-3) provides an alternating current voltage signal for the impedance electrode (1-1), and the impedance electrode (1-1) provides an impedance signal for the driving circuit board (2-1);
step 2: the impedance measurement module on the driving circuit board (2-1) performs signal processing and A/D conversion on the impedance signal, the temperature measurement module performs signal processing and A/D conversion on the temperature signal, and the impedance signal and the temperature signal are converted into voltage signals acceptable by a microprocessor on the signal processing circuit board (2-2);
and step 3: initializing a signal processing circuit board (2-2);
and 4, step 4: the signal processing module detects whether the impedance type icing detector works normally, if so, the step 5 is executed, and if not, the impedance type icing detector is detected to work normally in a circulating mode;
and 5: the signal processing module performs self-checking, and simultaneously detects whether the driving circuit board (2-1), the filtering power supply circuit board (2-3) and the signal output state are normal or not, if so, step 6 is executed, if not, the self-checking is performed in a circulating mode, and simultaneously, whether the driving circuit board (2-1), the filtering power supply circuit board (2-3) and the signal output state are normal or not is detected in a circulating mode;
step 6: the signal processing module judges whether the impedance signal reaches the icing condition, if so, the signal processing module sends an icing alarm signal to the upper computer and continues for a period of time, and if not, the signal processing module circularly judges whether the impedance signal reaches the icing condition.
The invention has the advantages and beneficial effects that:
the impedance icing probe can be glued to the leading edge of the aircraft wing with its internal impedance electrode in direct contact with the ice. The icing detector can be arranged at any position of the outer surface of the wing, provides wide-area icing detection capability, can detect icing at different attack angles, and improves the adaptability of the icing detector to different types of airplane.
The structural design of an exposed probe of an old icing detection device is broken through, the icing detection device is not required to be embedded into the wing during installation, the installation position is variable, and the icing detection device is adhered to the surface of the wing by using a high-temperature adhesive, so that the requirement of high stealth performance of part of airplanes is met.
The icing detection system consists of an impedance icing detector and an icing detection control box, wherein the exposed impedance icing detector consists of an impedance electrode and a temperature sensor, has a simpler structure and meets the requirements of the new generation of airplanes on the volume, the weight and the weight of the sensor.
Can decide to adopt the quantity of impedance formula icing detector according to the in service behavior, use the separated time cable to carry out electrical connection, adopt the redundancy design, can effectual promotion reliability and security. The icing detection system also has a self-checking function, and can effectively detect faults.
Drawings
FIG. 1 is a schematic diagram of an impedance icing detector;
FIG. 2 is a schematic structural diagram of an icing detection controller;
FIG. 3 is a schematic block diagram of the system of the present invention;
FIG. 4 is a flow chart of the signal processing module decision logic.
Detailed Description
The first embodiment is as follows:
as shown in figure 3, an icing detection system based on impedance measurement comprises a plurality of impedance type icing detectors, an icing detection controller 2 and an upper computer, wherein the icing detection controller 2 comprises a driving circuit board, a signal processing circuit board and a filtering power supply circuit board, the impedance type icing detectors comprise temperature sensors and impedance electrodes, the temperature sensors are in two-way connection with the driving circuit board, the driving circuit board provides voltage signals for the temperature sensors, the temperature sensors provide temperature signals for the driving circuit board, the impedance electrodes are connected with the driving circuit board and provide impedance signals for the driving circuit board, the filtering power supply circuit board is respectively connected with the driving circuit board and the impedance electrodes and provides alternating voltage signals for the driving circuit board and the impedance electrodes, the driving circuit board is connected with the signal processing circuit board and provides driving signals for the signal processing circuit board, the signal processing circuit board is connected with an upper computer, an alarm/fault signal is provided for the upper computer, the upper computer is connected with the filtering power supply circuit board, an alternating voltage is provided for the filtering power supply circuit board, and the filtering power supply circuit board is connected with the signal processing circuit board and provides a 5V power supply signal for the signal processing circuit board.
As shown in figure 1, the impedance type icing detector comprises impedance electrodes 1-1, temperature sensors 1-2, a supporting shell 1-3 and a socket 1-4, wherein the number of the impedance electrodes 1-1 is even, the impedance electrodes are arranged on the surface of the supporting shell 1-3, the temperature sensors 1-2 are arranged on the surface of the supporting shell 1-3, and the impedance electrodes 1-1 are connected with the socket 1-4. The ice detector has the advantages of simple structure and comprehensive performance, and can not only detect icing but also measure temperature.
Further, the support shell 1-3 is of an arc-shaped structure, the arc-shaped structure comprises an inner concave surface and an outer convex surface, the shape of the inner concave surface is matched with that of the front edge of the airplane wing, and the outer convex surface is provided with a temperature sensor 1-2 and an impedance electrode 1-1. The arc structural design can make the detector that freezes perfectly laminate to the wing surface, effectively freeze the stealthy nature that promotes detection system that freezes.
Further, the temperature sensor 1-2 and the impedance electrode 1-1 are bonded on the outer convex surface through a high-temperature adhesive. Compared with the traditional mechanical installation mode, the fixing mode of the high-temperature adhesive has the advantages that the installation position is not fixed, and the optimal installation mode can be selected according to the actual situation.
Furthermore, the impedance electrode is supported by an inert metal platinum material, and the support shell 1-3 is made of a composite material compatible with the airplane wing. The platinum metal should not be easily polarized, have low impedance and have long service life.
Furthermore, the icing detection controller structurally further comprises a socket 2-4, a base 2.5 and a rear cover 2.6, wherein the filtering power supply circuit board, the signal processing circuit board and the driving circuit board are sequentially stacked in the rear cover and the base through supporting columns, and the socket is arranged on the side part of the rear cover.
Furthermore, the number of the impedance icing detectors is 2, and the impedance icing detectors are respectively arranged at the front edges of the left wing and the right wing of the airplane. The redundancy design can effectively avoid interference, and the system can still work under the condition that one impedance icing detector fails, so that the stability of the system is improved.
Furthermore, the driving circuit board comprises an impedance measuring module, an impedance adjusting module and a temperature measuring module, wherein the temperature signal and the impedance signal are respectively subjected to signal processing and A/D conversion through the temperature measuring module and the impedance measuring module, the impedance signal and the temperature signal are converted into voltage signals acceptable by a microprocessor on the signal processing circuit board, and the impedance adjusting module adopts a negative feedback adjusting circuit and plays a role in eliminating the influence of raindrops or other interferents.
Further, the signal processing circuit board includes signal processing module, freezes alarm module, and signal processing module comprises microprocessor and peripheral circuit, receives impedance signal, temperature signal, judges whether impedance formula freezes the detector and is in under the environment that freezes, freezes alarm module and includes solid relay, opto-coupler, through solid relay, opto-coupler to the host computer output warning signal that freezes.
Example two:
the detection method of the icing detection system comprises the following steps:
step 1: the temperature sensor receives a direct-current voltage signal provided by the driving circuit board, the temperature sensor provides an atmospheric temperature signal for the driving circuit board, the filtering power supply circuit board provides an alternating-current voltage signal for the impedance electrode, and the impedance electrode provides an impedance signal for the driving circuit board;
step 2: the impedance measuring module on the driving circuit board performs signal processing and A/D conversion on the impedance signal, the temperature measuring module performs signal processing and A/D conversion on the temperature signal, and the impedance signal and the temperature signal are converted into voltage signals acceptable by a microprocessor on the signal processing circuit board;
and step 3: initializing a signal processing circuit board;
and 4, step 4: a signal processing module (BIT) detects whether the impedance type icing detector works normally, if so, step 5 is executed, and if not, the impedance type icing detector is detected to work normally in a circulating mode;
and 5: the signal processing module performs self-checking, and simultaneously detects whether the driving circuit board, the filtering power supply circuit board and the signal output state are normal or not, if so, the step 6 is executed, if not, the self-checking is performed in a circulating mode, and simultaneously, whether the driving circuit board, the filtering power supply circuit board and the signal output state are normal or not is detected in a circulating mode;
step 6: the signal processing module judges whether the impedance signal reaches the icing condition, if so, the signal processing module sends an icing alarm signal to the upper computer and continues for a period of time, and if not, the signal processing module circularly judges whether the impedance signal reaches the icing condition.
Example three:
an icing detection system based on impedance measurement comprises an impedance icing sensor and an icing detection control box, wherein the impedance icing sensor comprises a patch electrode 1-1, a temperature sensor 1-2, a supporting shell 1-3 and a socket 1-4, and the patch electrode 1-1 and the temperature sensor 1-2 are adhered to the supporting shell 1-3 through a high-temperature adhesive; the icing detection control box comprises a driving circuit board-2-1, a signal processing circuit board-2-2, a filtering power supply circuit board 2-3, a socket 2-4, a base 2-5 and a rear cover 2-6, wherein the filtering power supply circuit board 2-3, the signal processing circuit board 2-2 and the driving circuit board 2-1 are sequentially stacked in the rear cover 2-6 and the base 2-5 through supporting columns, and the socket 2-4 is arranged on the side part of the rear cover 2-6. Typically, a system includes two impedance ice sensors and an ice detection control box electrically connected by electrical connectors and distribution cables.
The impedance type icing sensor comprises two patch electrodes 1-1, a temperature sensor 1-2 (RTD), a connector tail accessory and a supporting material. The impedance type icing detector receives the voltage signal and continuously outputs an impedance signal and a temperature signal to the icing detection control box in real time. When ice is deposited on the patch electrode 1-1, the impedance changes, thereby performing an icing detection function.
The patch electrode 1-1 is a core component of the icing detector, and has the characteristics of difficult polarization, low impedance and long service life, so that inert metal platinum is generally used as a material for manufacturing the electrode. Platinum is an inert noble metal that is commonly used as an electron conductor for certain electrodes and does not itself participate in the electrode reaction.
The temperature sensor 1-2 plays a role in assisting in judging the icing environment, and because the conductivity of water is higher than that of ice, the electrode is easier to conduct under the action of alternating voltage, and at the moment, the temperature sensor 1-2 is needed to detect a temperature signal and judge whether the temperature is lower than 0 ℃ or not so as to provide correct icing environment information for icing signal analysis and system diagnosis.
The support material is made of composite material compatible with the wing.
The icing detection control box mainly comprises a driving circuit board-2-1, a signal processing circuit board-2-2 and a filtering power supply circuit board 2-3. The impedance icing detector processes and judges an impedance signal and a temperature signal sent by the impedance icing detector, and monitors the change of the impedance signal in real time to judge whether the icing detector is in an icing environment. The icing detection control box also has the functions of self-checking, filtering and anti-interference. Whether the system is in fault or in an abnormal working state can be monitored in real time.
The filter power supply circuit board 2-3 plays a role in receiving 115V voltage of the airplane, and the 115V voltage is converted into 12V alternating current and 5V direct current secondary power supplies through a transformer and a power supply processing circuit. 12V alternating current is used for driving the impedance electrode, and 5V direct current is used for driving the signal processing circuit and the driving circuit board. Meanwhile, the filter circuit is also arranged, so that the influences of power supply undervoltage, voltage spike and other interference signals can be effectively reduced.
The driving circuit board-2-1 comprises an impedance measuring module, an impedance adjusting module and a temperature measuring module. The impedance measuring module and the temperature measuring module convert the impedance signal and the temperature signal into voltage signals acceptable by the singlechip through signal processing and A/D conversion. The impedance adjusting module adopts a negative feedback adjusting circuit to eliminate the influence of raindrops or other interferents.
The signal processing circuit board-2-2 comprises a signal processing module and an icing warning module. The signal processing module mainly comprises a single chip microcomputer and a peripheral circuit, and is used for processing the impedance signal and the temperature signal and judging whether the ice-forming device is in an icing environment or not. The icing warning module outputs an icing warning signal outwards through the solid relay and the optical coupler. Meanwhile, the signal processing circuit also comprises a self-checking function and judges whether the system works normally.
When ice is accumulated on the patch electrode 1-1, the impedance of the patch electrode 1-1 is correspondingly reduced, and the icing detection control box judges whether the impedance icing detector is in an icing state or not according to the signal sent by the temperature sensor and the impedance of the patch electrode. Impedance measurements are measurements of the ratio of the sinusoidal voltage U applied to the system circuits or components and the current I flowing through them, and are among the basic parameters of telecommunications.
When ice adheres to the surface of a body, its electrical properties may vary depending on the substance in the middle of the ice, such as in air or water. An installed electrode, the electrical characteristics of which are abnormally active due to the application of an alternating voltage. From an electronic point of view, this is called the composite impedance, and as the thickness of ice increases, he will cause the adjacent electrodes to change. This change serves to convey the presence of ice. When ice covers the surface of the ice detector, the impedance changes due to the presence of ice, and the ice detection control box senses this change in electrical impedance, which when a corresponding signal is detected, indicates the presence of ice.
The rainwater has similar electrical characteristics, so that the raindrops with small area can eliminate interference through a negative feedback regulating circuit in the icing detection control box, but when the surface of the icing detector is completely covered by the rainwater, the electrodes are more easily conducted under the action of alternating voltage because the conductivity of water is higher than that of ice, and at the moment, a temperature sensor is needed to detect a temperature signal, judge whether the temperature is lower than 0 ℃ or not, so as to provide correct icing environment information for icing signal analysis and system diagnosis.
Claims (10)
1. An icing detection system based on impedance measurement, characterized by: the device comprises an icing detection controller and a plurality of impedance icing detectors, wherein the impedance icing detectors are respectively connected with the icing detection controller, the icing detection controller comprises a driving circuit board (2-1), a signal processing circuit board (2-2) and a filtering power supply circuit board (2-3), the impedance icing detectors comprise temperature sensors (1-2) and impedance electrodes (1-1), the temperature sensors (1-2) are bidirectionally connected with the driving circuit board (2-1), the driving circuit board (2-1) provides voltage signals for the temperature sensors (1-2), the temperature sensors (1-2) provide temperature signals for the driving circuit board (2-1), the impedance electrodes (1-1) are connected with the driving circuit board (21-), and provide impedance signals for the driving circuit board (2-1), the filtering power supply circuit board (2-3) is respectively connected with the driving circuit board (2-1) and the impedance electrode (1-1), an alternating voltage signal is provided for the driving circuit board (2-1), an excitation signal is provided for the impedance electrode (1-1), the driving circuit board (2-1) is connected with the signal processing circuit board (2-2), a driving signal is provided for the signal processing circuit board (2-2), the signal processing circuit board (2-2) is connected with an upper computer, an alarm/fault signal is provided for the upper computer, the upper computer is connected with the filtering power supply circuit board (2-3), an alternating voltage is provided for the filtering power supply circuit board (2-3), the filtering power supply circuit board (2-3) is connected with the signal processing circuit board (2-2), and a power supply voltage signal is provided for the signal processing circuit board (2-2).
2. An impedance measurement based icing detection system according to claim 1, wherein: the temperature sensor comprises impedance electrodes (1-1), temperature sensors (1-2), a supporting shell (1-3) and a socket (1-4), wherein the number of the impedance electrodes (1-1) is even, the impedance electrodes (1-1) are separately arranged on the surface of the supporting shell (1-3), the temperature sensors (1-2) are arranged on the surface of the supporting shell (1-3), and the impedance electrodes (1-1) are connected with the socket (1-4).
3. An impedance measurement based icing detection system according to claim 2, wherein: the support shell (1-3) is of an arc-shaped structure, the arc-shaped structure comprises an inner concave surface and an outer convex surface, the shape of the inner concave surface is matched with that of the front edge of the airplane wing, and the outer convex surface is provided with a temperature sensor (1-2) and an impedance electrode (1-1).
4. An impedance measurement based icing detection system according to claim 3, wherein: the temperature sensor (1-2) and the impedance electrode (1-1) are bonded on the outer convex surface through a high-temperature adhesive.
5. An impedance measurement based icing detection system according to claim 2, wherein: the impedance electrode (1-1) is supported by an inert metal platinum material, and the support shell (1-3) is made of a composite material compatible with the airplane wing.
6. An impedance measurement based icing detection system according to claim 1, wherein: the structure of the power supply device also comprises a socket (2-4), a base (2-5), a rear cover (2-6), a filtering power supply circuit board (2-3), a signal processing circuit board (2-2) and a driving circuit board (2-1) which are sequentially stacked in the rear cover (2-6) and the base (2-5) through a support column, and the socket (2-4) is arranged on the side part of the rear cover (2-6).
7. An impedance measurement based icing detection system according to claim 1, wherein: the number of the impedance icing detectors is 2, and the impedance icing detectors are respectively arranged on the front edges of the left wing and the right wing of the airplane.
8. An impedance measurement based icing detection system according to claim 1, wherein: the driving circuit board (2-1) comprises an impedance measuring module, an impedance adjusting module and a temperature measuring module, wherein the temperature signal and the impedance signal are respectively subjected to signal processing and A/D conversion through the temperature measuring module and the impedance measuring module, the impedance signal and the temperature signal are converted into voltage signals acceptable by a microprocessor on the signal processing circuit board, and the impedance adjusting module adopts a negative feedback adjusting circuit to play a role in eliminating the influence of raindrops or other interferents.
9. An impedance measurement based icing detection system according to claim 1, wherein: the signal processing circuit board (2-2) comprises a signal processing module and an icing warning module, the signal processing module is composed of a microprocessor and a peripheral circuit, the signal processing module receives impedance signals and temperature signals and judges whether the impedance type icing detector is in an icing environment or not, the icing warning module comprises a solid relay and an optical coupler, and icing warning signals are output to an upper computer through the solid relay and the optical coupler.
10. The icing detection system detection method according to any one of claims 1-9, wherein: the method comprises the following steps:
step 1: the temperature sensor (1-2) receives a direct current voltage signal provided by the driving circuit board (2-1) through a signal, the temperature sensor (1-2) provides (2-1) an atmospheric temperature signal for the driving circuit board, the filtering power supply circuit board (2-3) provides an alternating current voltage signal for the impedance electrode (1-1), and the impedance electrode (1-1) provides an impedance signal for the driving circuit board (2-1);
step 2: the impedance measurement module on the driving circuit board (2-1) performs signal processing and A/D conversion on the impedance signal, the temperature measurement module performs signal processing and A/D conversion on the temperature signal, and the impedance signal and the temperature signal are converted into voltage signals acceptable by a microprocessor on the signal processing circuit board (2-2);
and step 3: initializing a signal processing circuit board (2-2);
and 4, step 4: the signal processing module detects whether the impedance type icing detector works normally, if so, the step 5 is executed, and if not, the impedance type icing detector is detected to work normally in a circulating mode;
and 5: the signal processing module performs self-checking, and simultaneously detects whether the driving circuit board (2-1), the filtering power supply circuit board (2-3) and the signal output state are normal or not, if so, step 6 is executed, if not, the self-checking is performed in a circulating mode, and simultaneously, whether the driving circuit board (2-1), the filtering power supply circuit board (2-3) and the signal output state are normal or not is detected in a circulating mode;
step 6: the signal processing module judges whether the impedance signal reaches the icing condition, if so, the signal processing module sends an icing alarm signal to the upper computer and continues for a period of time, and if not, the signal processing module circularly judges whether the impedance signal reaches the icing condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011572803.6A CN112550724B (en) | 2020-12-25 | 2020-12-25 | Icing detection system and method based on impedance measurement |
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| CN202011572803.6A CN112550724B (en) | 2020-12-25 | 2020-12-25 | Icing detection system and method based on impedance measurement |
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| CN112960120A (en) * | 2020-12-28 | 2021-06-15 | 南京航空航天大学 | Ultrasonic guided wave detection system based on piezoelectric film |
| CN113286391A (en) * | 2021-05-31 | 2021-08-20 | 华中科技大学 | Ice detecting and removing device and method |
| CN114447804A (en) * | 2021-12-20 | 2022-05-06 | 山东泰开隔离开关有限公司 | Fire protection system and method suitable for isolating switch |
| CN117368232A (en) * | 2023-10-08 | 2024-01-09 | 江苏麦赫物联网科技有限公司 | Miniature ice and water accumulation sensor |
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