CN113932885A - Water level detection device and method - Google Patents
Water level detection device and method Download PDFInfo
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- CN113932885A CN113932885A CN202111174104.0A CN202111174104A CN113932885A CN 113932885 A CN113932885 A CN 113932885A CN 202111174104 A CN202111174104 A CN 202111174104A CN 113932885 A CN113932885 A CN 113932885A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/296—Acoustic waves
- G01F23/2962—Measuring transit time of reflected waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
- G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
Abstract
The device comprises a host and a probe arranged on a floater, wherein the host comprises a first sound wave module and a controller, and the first sound wave module is used for transmitting a first sound wave signal and receiving a second sound wave signal; the probe comprises a second sound wave module, and the second sound wave module is used for transmitting a second sound wave signal with preset frequency after receiving the first sound wave signal; the controller is used for controlling the first sound wave module to emit a first sound wave signal with preset frequency, acquiring a first time point, acquiring a second time point when the first sound wave module receives a second sound wave signal, and calculating the distance between the first sound wave module and the second sound wave module according to the time difference between the first time point and the second time point and the sound wave transmission speed, wherein the preset frequency of the sound wave is between 2.1 and 2.8k, so that the interference of other sound waves can be effectively inhibited, and the sound wave in the frequency can be transmitted by more than 200 meters in the water level pipe, so that the water level pipe has a measurement range.
Description
Technical Field
The application relates to the technical field of water level monitoring, in particular to a water level detection device and method.
Background
The measurement of the groundwater level plays a very important role in the construction engineering, and is directly related to the quality of construction projects and the safety of constructors, particularly in areas close to water sources, the change of the groundwater level is usually severe, and in order to ensure the construction safety, the change of the groundwater level must be strictly monitored.
At present, can generally set up the diameter at the job site specially and be about 60 mm's water level hole, and the engineer measures the water level through the steel rule fluviograph, and when measuring, the engineer will have the steel rule of two contacts to put into the aquatic, and the break-make signal that produces when contacting the surface of water through the steel rule obtains the height of water level.
In view of the above-mentioned related technologies, the inventor considers that such a fully manual measurement method is cumbersome, and the measurement accuracy is related to the skill level of the operator, and has instability.
Disclosure of Invention
In order to solve the technical problem, the application provides a water level detection device and a water level detection method.
In a first aspect, the present application provides a water level detection device, which adopts the following technical scheme:
a water level detecting device comprising:
the host comprises a first sound wave module and a controller, wherein the first sound wave module is used for transmitting a first sound wave signal and receiving a second sound wave signal;
the probe is arranged on the floater and comprises a second sound wave module, and the second sound wave module is used for transmitting a second sound wave signal with preset frequency after receiving the first sound wave signal;
the controller is configured to control the first acoustic wave module to emit a first acoustic wave signal with a preset frequency, acquire a first time point, acquire a second time point when the first acoustic wave module receives the second acoustic wave signal, and calculate a distance between the first acoustic wave module and the second acoustic wave module according to a time difference between the first time point and the second time point and an acoustic wave transmission speed, where the preset frequency is between 2.1k and 2.8 k.
By adopting the technical scheme, when the underground water level is measured, the host can be placed at the opening of the water level hole, the floater is thrown into water, the probe is exposed out of the water surface, the controller can control the first sound wave module arranged in the host to transmit a first sound wave signal with preset frequency, simultaneously the first time point is recorded, the second sound wave module arranged on the probe can receive the first sound wave signal and actively transmit a second sound wave signal with preset frequency, the controller records the second time point after the first sound wave module receives the second sound wave module, the controller can calculate the distance between the first sound wave module and the second sound wave module according to the time difference between the first time point and the second time point and the sound wave transmission speed, the method adopts the mode that the probe actively reflects after receiving the first sound wave signal, and reduces the influence of sound wave attenuation on the measurement result, and this application adopts the low frequency sound wave of frequency between 2.1-2.8k, can effectively restrain the interference of other sound waves to can transmit more than 200 meters in the water level pipe, make this application have sufficient measuring range.
Optionally, the first acoustic module includes a first acoustic transmitter and a first acoustic receiver, and the second acoustic module includes a second acoustic transmitter and a second acoustic receiver.
Optionally, the probe further includes a wake-up module, the controller is further configured to control the first sound wave module to send a trigger signal before the first sound wave module sends the first sound wave signal, and the wake-up module wakes up the probe after receiving the trigger signal through the second sound wave receiver, and sends a response signal to the controller through the second sound wave transmitter.
By adopting the technical scheme, the probe can be in a dormant state when not working, and the wake-up module can wake up the probe, so that the probe enters a working state, the electric quantity of the probe can be effectively saved, and the cruising ability of the probe is improved.
Optionally, the host further includes a human-computer interaction module, where the human-computer interaction module is configured to output a start signal to the controller, and the controller receives the start signal and outputs the trigger signal.
By adopting the technical scheme, the staff can start the host by operating the human-computer interaction module, and further wake up the probe to acquire water level measurement data.
Optionally, the probe further includes a delay module, and the delay module is configured to control the second acoustic module to transmit the second acoustic signal after delaying for a preset time after the second acoustic module receives the first acoustic signal.
By adopting the technical scheme, the second acoustic wave module cannot immediately transmit the second acoustic wave signal after receiving the first acoustic wave signal, certain reaction time is needed, an error can be caused to a measurement result, the delay module controls the second acoustic wave module to transmit the second acoustic wave signal after delaying the preset time, enough reaction time is reserved for the second acoustic wave module, and the measurement error is reduced.
Optionally, the probe further includes a power supply module, the power supply module is configured to supply power to the second sound wave module and the wake-up module, and the electric quantity information of the power supply module is sent to the controller through the second sound wave transmitter.
Through adopting above-mentioned technical scheme, power module sends electric quantity information to the controller, makes things convenient for the staff to monitor power module's electric quantity.
Optionally, the host further includes a display module, and the display module is configured to display the distance and the power information.
Optionally, the host further comprises a temperature compensator.
Through adopting above-mentioned technical scheme, temperature compensator can measure the downthehole temperature of water level, and the controller can confirm the sound wave transmission speed according to the temperature.
In a second aspect, the present application provides a water level detection method based on the water level detection apparatus according to the first aspect, including:
the controller controls the first sound wave module to emit a first sound wave signal with preset frequency to the water surface at the opening of the water level hole, and meanwhile, a first time point is obtained;
a second acoustic wave module in the probe on the water surface transmits a second acoustic wave signal with preset frequency after receiving the first acoustic wave signal;
and the controller acquires a second time point when receiving a second sound wave signal, and calculates the distance between the first sound wave module and the second sound wave module according to the time difference between the first time point and the second time point and the sound wave transmission speed, wherein the preset frequency is between 2.1 and 2.8 k.
Optionally, before the controller controls the first sound wave module to transmit the first sound wave signal with the preset frequency to the water surface at the opening of the water level hole and obtain the first time point, the method further includes:
the controller controls the first sound wave module to send a trigger signal, and the probe feeds back a response signal after receiving the trigger signal
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the underground water level is measured, the host can be placed at the opening of the water level hole, the floater is thrown into water, the probe is exposed out of the water surface, the probe is in an active reflection mode after receiving a first sound wave signal transmitted by the host, the controller of the host calculates the distance between the host and the probe according to the time difference between the transmission of the controller and the reception of the sound wave and the transmission speed of the sound wave after receiving a second sound wave signal transmitted by the probe, the influence of the attenuation of the sound wave on a measurement result is reduced, the low-frequency sound wave with the frequency of 2.1-2.8k is adopted, the interference of other sound waves can be effectively inhibited, and more than 200 meters can be transmitted in the water level pipe, so that the underground water level measuring device has a sufficient measuring range;
2. the probe can be in a dormant state when not working, and the wake-up module can wake up the probe so that the probe enters a working state, thereby effectively saving the electric quantity of the probe and improving the cruising ability of the probe;
3. the time delay module controls the second sound wave module to transmit the second sound wave signal after delaying for the preset time, so that enough reaction time is reserved for the second sound wave module, and the measurement error is reduced.
Drawings
Fig. 1 is a system diagram of a water level detecting device according to an embodiment of the present application.
Fig. 2 is a schematic view of the overall structure of the water level detecting device according to the embodiment of the present application.
FIG. 3 is a flowchart illustrating a water level detecting method according to an embodiment of the present application.
Description of reference numerals: 1. a host; 11. a first acoustic wave module; 12. a controller; 13. a display module; 14. a human-computer interaction module; 15. a communication module; 16. a temperature compensator; 2. a probe; 21. a second acoustic module; 22. a processor; 221. a delay module; 222. a wake-up module; 23. a power supply module; 3. a float.
Detailed Description
Various exemplary embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
At present, in order to measure the underground water level, a water level hole with the diameter of about 60mm is generally specially formed in a construction site, a water level pipe is arranged in the water level hole, an engineer measures the water level through a steel ruler water level gauge, the engineer puts a steel ruler with two contacts into water during measurement, and the height of the water level is obtained through an on-off signal generated when the steel ruler is in contact with the water level.
The water level measuring method with osmometer is to measure the pressure difference between the water level and the sensor, and this measurement method depends mainly on atmospheric pressure to calculate the pressure difference, and has great measurement precision, less measurement error of 0.5 m and instability.
The application discloses water level detection device, including host computer 1 and probe 2, host computer 1 includes first sound wave module 11 and controller 12, and probe 2 includes second sound wave module 21, and probe 2 sets up on float 3, and first sound wave module 11 is used for launching first sound wave signal, still is used for receiving second sound wave signal, and second sound wave module 21 then is used for receiving first sound wave signal, still is used for after receiving first sound wave signal, launches the second sound wave signal of predetermineeing the frequency.
This application is when using, and host computer 1 places the opening part in water level hole, and probe 2 then drops into the aquatic along with float 3, and float 3 can float in the surface of water to make probe 2 expose from the surface of water, this moment, the distance between host computer 1 and the probe 2, be the distance of ground and surface of water promptly.
The controller 12 can control the first acoustic module 11 to send a first acoustic signal with a preset frequency, and obtain a first time point while the first acoustic signal is sent, the second acoustic module 21 transmits a second acoustic signal with a preset frequency after receiving the first acoustic signal, the controller 12 obtains a second time point after the first acoustic module 11 receives the second acoustic signal, and according to a time difference between the first time point and the second time point and an acoustic wave transmission speed, a distance between the first acoustic module 11 and the second acoustic module 21, namely a distance between the host 1 and the probe 2, is also a distance between the ground and the water surface.
In this embodiment, the probe 2 further includes a delay module 221 connected to the second acoustic module 21, where the delay module 221 may be integrated in the processor 22, and since the second acoustic module 21 has a delay from the time when receiving the first acoustic signal to the time when actively transmitting the second acoustic signal, a calculation error is easily caused, therefore, the delay module 221 controls the second acoustic module 21 to delay for a preset time after receiving the first acoustic signal, and then transmit the second acoustic signal, so as to reserve a sufficient response time for the second acoustic module 21 and the processor 22, and reduce the calculation error.
Taking the distance as L, the first time point as T1, the second time point as T2, the preset time as T3, the sound velocity as V, the calculation formula of the distance is:
the preset time may be 1s or 2s, and may be specifically set according to the actual situation.
In the embodiment of the application, the host 1 is arranged at the opening of the water level hole, the probe 2 is arranged on the floater 3 capable of floating on the water level, the first sound wave module 11 is arranged on the host 1, the second sound wave module 21 is arranged on the probe 2, the first sound wave signal with the preset frequency is transmitted to the second sound wave module 21 through the first sound wave module 11, the second sound wave signal with the preset frequency is actively reflected by the second sound wave module 21 after the second sound wave module 21 receives the first sound wave module 11, the distance between the host 1 and the probe 2 is calculated by the controller 12 according to the transmission time and the transmission speed of the sound wave, compared with the mode that the traditional sound wave generator transmits the sound wave to the water level and then receives the sound wave reflected by the water level, the second sound wave module 21 actively reflects the second sound wave signal, and the influence of the sound wave attenuation and the water level fluctuation on the water level detection result can be effectively reduced, the method and the device have the advantages of convenience in detection and high detection precision.
In the embodiment of the present application, the first acoustic module 11 includes a first acoustic transmitter and a first acoustic receiver, and the second acoustic module 21 includes a second acoustic transmitter and a second acoustic receiver.
In the embodiment of the present application, the probe 2 further includes a power supply module 23 for supplying power to the processor 22 and the second acoustic wave module 21, so as to facilitate grasping the electric quantity information of the power supply module 23, the processor 22 can obtain the electric quantity of the power supply module 23, convert the electric quantity information of the power supply module 23 into an electric quantity acoustic wave signal through the second acoustic wave transmitter, and send the electric quantity acoustic wave signal to the controller 12; the controller 12 receives the electric quantity acoustic wave signal, and demodulates the electric quantity acoustic wave signal to obtain the electric quantity information of the power supply module 23.
Because the probe 2 is placed in water and is not convenient to take out, the cruising ability of the power supply module 23 is particularly important, in order to increase the cruising duration of the power supply module 23, the processor 22 controls the probe 2 to be in a dormant state in a non-working state, the probe 2 further comprises a wake-up module 222, the wake-up module 222 can be integrated in the processor 22, the wake-up module 222 can wake up the probe 2, so that the probe 2 enters a working state, and after the second sound wave module 21 transmits a second sound wave signal, the processor 22 controls the probe 2 to enter the dormant state.
Specifically, before the controller 12 controls the first acoustic wave transmitter to transmit the first acoustic wave signal, the first acoustic wave transmitter transmits a trigger signal, the wake-up module 222 wakes up the probe 2 after receiving the trigger signal, so that the probe 2 enters the working state, and sends a response signal to the controller 12 through the second acoustic wave transmitter, and after receiving the response signal, the controller 12 knows that the probe 2 is in the working state at this time, and can send the first acoustic wave signal to the probe 2.
It should be noted that the trigger signal and the response signal are both sound waves with a frequency of 2.1K-2.8K, and the manner of distinguishing from the first sound wave signal and the second sound wave signal may be to adjust the frequencies of the trigger signal and the response signal, or to adjust the number of pulse waves emitted by the trigger signal and the response signal.
In the embodiment of the present application, in order to facilitate taking out the probe 2 from the water, an iron sheet may be disposed at an end of the float 3, and when taking out the probe 2, a worker may take out the float 3 from the water by using a magnetic block having a magnetic force.
In the embodiment of the present application, the host 1 further includes a display module 13, a human-computer interaction module 14, a communication module 15, and a temperature compensator 16.
The display module 13 may be a display screen disposed on the host 1, and can display the measured distance and the power information of the power supply module 23 of the probe 2.
The human-computer interaction module 14 may be a button disposed on the host 1, and specifically may be disposed on one side of the display screen, where the button includes a start key, and when the start key is pressed, the controller 12 receives a start signal, starts the host 1, and then the controller 12 sends a trigger signal to the probe 2 to wake up the probe 2, so as to measure the groundwater level.
The communication module 15 is mainly used for data transmission between the controller 12 and the server, so that the controller 12 can transmit the measurement data to the server, the centralized management of the measurement data is facilitated, and the communication module 15 can be 4G, 5G, wireless WiFi and the like.
The temperature compensator 16 may be disposed below the main body 1, and when in use, the temperature compensator 16 extends into the water level hole to detect the temperature in the water level hole, so that the controller 12 can determine the transmission speed of the sound wave according to the temperature.
According to the measuring method, after the probe 2 receives the signal of the host 1, the signal is actively reflected to the host 1, and an operator tests various communication modes to establish signal connection between the host 1 and the probe 2, wherein the signal connection comprises optical communication, electromagnetic wave communication and sound wave communication adopted by the application.
Wherein, the optical communication mode that gives first place to laser and infrared, because the water level pipeline can not guarantee strict vertically, almost all water level pipes are all crooked underground to water level pipe arm has the comdenstion water, and the optical communication modes such as laser and infrared are unreliable in the groundwater level detects.
Electromagnetic waves mainly based on Zigbee, Bluetooth and RFID are not suitable for detection of underground water level, and due to strong polarity of the ground, the electromagnetic waves are absorbed and interfered by the ground magnetic field in a water pipe, in the actual test process, the transmission distance of the electromagnetic waves is seriously attenuated after exceeding 1 meter, the total transmission distance is hardly more than 2 meters, and the electromagnetic waves cannot be used for detection of the underground water level.
The sound wave communication mode includes ultrasonic wave and the low frequency sound wave that this application adopted, and the ultrasonic wave frequency is above 20K, and the inventor finds in the experiment that because the ultrasonic wave frequency is higher, the decay is serious when long-distance transmission, and when the intraductal transmission of water level, its transmission distance is no longer than 1.5 meters, can't be applied to ground water level and measure.
Through a large number of tests, operators finally obtain low-frequency sound waves with the frequency of 2.1K-2.8K, the transmission distance in the water level pipe can reach more than 200 meters, the low-frequency sound waves are suitable for underground water level measurement, and the low-frequency sound waves with the frequency of 2.1K-2.8K can effectively inhibit other sound wave interferences, such as automobile whistling, thunderstorm sound and the like.
In another aspect, the present application also discloses a water level detecting method, including:
step S100, the controller 12 controls the first acoustic wave module 11 to emit a first acoustic wave signal with a preset frequency to the water surface at the opening of the water level hole, and obtain a first time point at the same time.
Step S200, after receiving the first sound wave signal, the second sound wave module 21 in the probe 2 positioned on the water surface transmits a second sound wave signal with preset frequency;
step S300, the controller 12 obtains a second time point when receiving the second acoustic signal, and calculates a distance between the first acoustic module 11 and the second acoustic module 21 according to a time difference between the first time point and the second time point and an acoustic wave transmission speed.
The preset frequency of the first sound wave signal and the second sound wave signal is between 2.1 and 2.8k, and after the probe 2 receives the first sound wave signal, the second sound wave signal can be fed back after delaying the preset time in order to reduce the interference of the echo of the water pipe.
In some embodiments, in order to prolong the duration of the power supply module 23 in the probe 2, the probe 2 may be in a sleep state in the non-operating state, and the controller 12 sends a trigger signal to the water surface to wake up the probe 2 in the sleep state before controlling the first acoustic wave module 11 to send the first acoustic wave signal, and the second acoustic wave signal feeds back a response signal after receiving the trigger signal. The controller 12, upon receiving the response signal, transmits the first acoustic signal to measure the water level.
The application discloses a water level detection method, adopt the opening part at the water level hole to surface of water transmission first sound wave signal, 2 probes that float on the surface of water are after receiving first sound wave signal, the initiative reflects the second sound wave signal, controller 12 calculates the distance that obtains water level hole opening and surface of water according to the time of sound wave transmission and sound wave transmission speed, and then obtain ground water level, with traditional sound wave generator to surface of water transmission sound wave, the mode of the reflected sound wave of surface of water of receiving again is compared, 2 initiative reflection second sound wave signals of probe, can effectually reduce because the sound wave decay, the influence of surface of water fluctuation to the water level testing result, this application has the detection convenience, detect the high advantage of precision.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A water level detection apparatus, comprising:
the host (1) comprises a first sound wave module (11) and a controller (12), wherein the first sound wave module (11) is used for transmitting a first sound wave signal and receiving a second sound wave signal;
the probe (2) is arranged on the floater (3) and comprises a second sound wave module (21), and the second sound wave module (21) is used for transmitting a second sound wave signal with a preset frequency after receiving the first sound wave signal;
the controller (12) is configured to control the first acoustic wave module (11) to transmit a first acoustic wave signal with a preset frequency, acquire a first time point, acquire a second time point when the first acoustic wave module (11) receives the second acoustic wave signal, and calculate a distance between the first acoustic wave module (11) and the second acoustic wave module (21) according to a time difference between the first time point and the second time point and an acoustic wave transmission speed, where the preset frequency is between 2.1k and 2.8 k.
2. The water level detection device according to claim 1, wherein the first acoustic module (11) comprises a first acoustic transmitter and a first acoustic receiver, and the second acoustic module (21) comprises a second acoustic transmitter and a second acoustic receiver.
3. The water level detecting device according to claim 2, wherein the probe (2) further comprises a wake-up module (222), the controller (12) is further configured to control the first sound wave module (11) to send a trigger signal before controlling the first sound wave module (11) to send the first sound wave signal, and the wake-up module (222) wakes up the probe (2) after receiving the trigger signal through the second sound wave receiver and sends a response signal to the controller (12) through the second sound wave transmitter.
4. The water level detecting device according to claim 3, wherein the main machine (1) further comprises a human-computer interaction module (14), the human-computer interaction module (14) is configured to output an activation signal to the controller (12), and the controller (12) receives the activation signal and outputs the trigger signal.
5. The water level detecting device according to claim 4, wherein the probe (2) further comprises a delay module (221), and the delay module (221) is configured to control the second acoustic module (21) to delay for a preset time after the second acoustic module (21) receives the first acoustic signal, and then to emit the second acoustic signal.
6. The water level detecting device according to claim 3, wherein the probe (2) further comprises a power supply module (23), the power supply module (23) is used for supplying power to the second sound wave module (21) and the wake-up module (222), and the power information of the power supply module (23) is sent to the controller (12) through the second sound wave transmitter.
7. The water level detecting device according to claim 6, wherein the host (1) further comprises a display module (13), and the display module (13) is used for displaying the distance and the power information.
8. Water level detection device according to claim 1, characterized in that the main machine (1) further comprises a temperature compensator (16).
9. A water level detection method based on the water level detection apparatus according to any one of claims 1 to 8, comprising:
the controller (12) controls the first sound wave module (11) to emit a first sound wave signal with a preset frequency to the water surface at the opening of the water level hole, and meanwhile, a first time point is obtained;
a second sound wave module (21) in the probe (2) positioned on the water surface transmits a second sound wave signal with preset frequency after receiving the first sound wave signal;
the controller (12) acquires a second time point when receiving a second sound wave signal, and calculates the distance between the first sound wave module (11) and the second sound wave module (21) according to the time difference between the first time point and the second time point and the sound wave transmission speed, wherein the preset frequency is 2.1-2.8 k.
10. The water level detecting method according to claim 9, wherein before the controller (12) controls the first acoustic module (11) to emit the first acoustic signal with the preset frequency to the water surface at the opening of the water level hole and obtain the first time point, the method further comprises:
the controller (12) controls the first sound wave module (11) to send a trigger signal, and the probe (2) feeds back a response signal after receiving the trigger signal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114543939A (en) * | 2022-03-09 | 2022-05-27 | 内蒙古金原农牧科技有限公司 | Sensor technology for monitoring underground water by utilizing ultrasonic sensor |
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