A high-precision ultrasonic ranging device and method

Abstract

The application relates to the technical field of ultrasonic ranging, and particularly discloses a high-precision ultrasonic ranging device and method, which comprises an ultrasonic sensor, a protective cover arranged outside the ultrasonic sensor, a first sound wave reflecting device arranged on the protective cover, and a second sound wave reflecting device arranged between the first sound wave reflecting device and a target surface to be measured. The ultrasonic sensor is arranged in the protective cover, so that the ultrasonic speed in the protective cover is not affected by weather such as rain, snow, air temperature and storms; the first sound wave reflecting device and the second sound wave reflecting device are arranged, and a new algorithm is introduced, so that the problem that the signal speed of the previous ultrasonic ranging device is different when the signal is transmitted in different media and the speed cannot be corrected is solved, the precision of the ultrasonic ranging device is improved, and the measurement result is more accurate.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic ranging technology, and specifically to a high-precision ultrasonic ranging device and method. Background Technology

[0002] Ultrasonic ranging is a technology that has been researched for many years, and related products are available. These products and technologies are sufficient for general ranging, achieving centimeter-level or even millimeter-level accuracy. However, for higher precision measurements, the speed at which ultrasound waves propagate in different media needs to be considered.

[0003] Chinese patent application CN111175757A discloses a high-precision ultrasonic rangefinder. It uses a standard-distance acoustic wave reflector in front of the testing device. After the ultrasonic sensor emits an ultrasonic wave, it receives the ultrasonic wave returned by the standard distance device at time T1 and the ultrasonic wave returned by the measured object at time T2. Since the distance of the standard distance device is constant, the current accurate velocity V of the ultrasonic wave is calculated based on the return time of the standard device. Then, the accurate distance S of the measured object is calculated based on the calculated velocity V and the time T2 for the ultrasonic wave to return from the measured object (S = V × T2), i.e., S2 = (S1 ÷ T1) × T2. This completely avoids the influence of ambient temperature and air density on the test, resulting in more accurate measurement results.

[0004] The above method is sufficient under normal circumstances. However, when considering high-precision ranging, the speed of ultrasonic waves is not constant under different weather conditions. Therefore, it is necessary to consider the speed correction of ultrasonic waves when they pass through different media in order to further improve the accuracy of ranging.

[0005] Therefore, the applicant proposes a high-precision ultrasonic ranging device and method to solve the above problems. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a high-precision ultrasonic ranging device and method.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A high-precision ultrasonic ranging device includes an ultrasonic sensor, a protective cover is provided outside the ultrasonic sensor, a first acoustic wave reflecting device is installed on the protective cover, and a second acoustic wave reflecting device is provided between the first acoustic wave reflecting device and the target surface to be measured.

[0009] Furthermore, the protective cover has an opening, and a first sound wave reflecting device is installed on one side of the opening.

[0010] Furthermore, it also includes a microprocessor and a display, the microprocessor being connected to the display and the ultrasonic sensor, respectively.

[0011] Furthermore, it also includes a wireless transmission module, which is connected to the microprocessor, and the microprocessor connects to an external client through the wireless transmission module.

[0012] Furthermore, the wireless transmission module is a Bluetooth module.

[0013] A high-precision ultrasonic ranging method, the specific steps of which are as follows:

[0014] Step 1: Record the distance between the ultrasonic sensor and the first sound wave reflecting device as S1, the distance between the ultrasonic sensor and the second sound wave reflecting device as S2, the distance between the ultrasonic sensor and the target surface to be measured as S3, the ultrasonic velocity inside the protective cover as Vi, and the ultrasonic velocity outside the protective cover as Vo.

[0015] Step 2: After the ultrasonic sensor emits an ultrasonic wave, the time it takes to receive the return from the first sound wave reflection device is recorded as 2Ti. According to S=V×T, the following calculation formula can be derived: S1=Vi×Ti;

[0016] Step 3: After the ultrasonic sensor emits an ultrasonic wave, the time it takes to receive the return from the second sound wave reflection device is recorded as 2To. According to S=V×T and combined with the calculation formula in Step 2, the following calculation formula can be obtained: S2=Vi×Ti+(To-Ti)×Vo;

[0017] Step 4: After the ultrasonic sensor emits ultrasonic waves, the time it takes to receive the return from the target surface is recorded as 2Tu. According to S=V×T and combined with the calculation formula in Step 2, the following calculation formula can be obtained: S3=Vi×Ti+(Tu-Ti)×Vo;

[0018] Step 5: Combining the calculation formulas from Steps 2, 3, and 4, the following calculation formula can be derived:

[0019]

[0020] S1 and S2 are fixed known values.

[0021] Furthermore, Ti, To, and Tu are all half the round-trip time of the ultrasound.

[0022] Compared with the prior art, the present invention provides a high-precision ultrasonic ranging device and method, which has the following beneficial effects:

[0023] This invention places the ultrasonic sensor inside a protective cover, ensuring that the ultrasonic speed inside the cover is not affected by weather conditions such as rain, snow, temperature, or storms. By incorporating a first and a second acoustic wave reflection device and introducing a new algorithm, it solves the problem of previous ultrasonic ranging devices being unable to correct for the different speeds of signals propagating in different media. This improves the accuracy of the ultrasonic ranging device, resulting in more accurate measurement results. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the present invention.

[0025] The diagram shows: 1. Ultrasonic sensor; 2. First acoustic wave reflector; 3. Second acoustic wave reflector; 4. Target surface; 5. Protective cover. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0028] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] This invention provides a high-precision ultrasonic ranging device, referring to... Figure 1The device includes an ultrasonic sensor 1, which is provided with a protective cover 5. A first acoustic wave reflecting device 2 is installed on the protective cover 5, and a second acoustic wave reflecting device 3 is provided between the first acoustic wave reflecting device 2 and the target surface 4 to be measured.

[0031] Specifically, ultrasonic sensor 1 is an existing device used for transmitting and receiving ultrasonic waves.

[0032] In this embodiment, the protective cover 5 has an opening, and a first sound wave reflecting device 2 is installed on one side of the opening.

[0033] Specifically, by setting up a protective cover 5, the ultrasonic speed inside the protective cover 5 will not be affected by weather conditions such as rain, snow, temperature, storms, etc.; an opening is provided on one side of the protective cover 5; a first sound wave reflecting device 2 is installed at the top of the opening; the target surface 4 to be measured is set outside the protective cover 5.

[0034] In this embodiment, a microprocessor and a display are also included, wherein the microprocessor is connected to the display and the ultrasonic sensor 1, respectively.

[0035] Specifically, the microprocessor is used to control the working state of the ultrasonic sensor 1 and read the measurement data of the ultrasonic sensor 1; the display is used to display the test results on the screen.

[0036] In this embodiment, a wireless transmission module is also included. The wireless transmission module is connected to the microprocessor, and the microprocessor is connected to an external client through the wireless transmission module.

[0037] In this embodiment, the wireless transmission module is a Bluetooth module.

[0038] Specifically, the Bluetooth module is used to transmit test results to other devices such as mobile phones.

[0039] It also includes a DC / DC converter, which is connected to the microprocessor and is used to control the operation and shutdown of the ultrasonic sensor 1.

[0040] The structure and principles of the ultrasonic sensor 1, microprocessor, display, DC / DC converter and Bluetooth module are all existing technologies. The algorithm of this application is processed in the MCU, which is a common practice and will not be elaborated on here.

[0041] Reference Figure 1 A high-precision ultrasonic ranging method, the specific steps of which are as follows:

[0042] Step 1: Record the distance between the ultrasonic sensor 1 and the first acoustic wave reflecting device 2 as S1, the distance between the ultrasonic sensor 1 and the second acoustic wave reflecting device 3 as S2, the distance between the ultrasonic sensor 1 and the target surface 4 to be measured as S3, the ultrasonic velocity inside the protective cover 5 as Vi, and the ultrasonic velocity outside the protective cover 5 as Vo.

[0043] Step 2: After the ultrasonic sensor 1 emits an ultrasonic wave, the time it takes to receive the return from the first sound wave reflecting device 2 is recorded as 2Ti. According to S=V×T, the following calculation formula can be derived: S1=Vi×Ti;

[0044] Step 3: After the ultrasonic sensor 1 emits an ultrasonic wave, the time it takes to receive the return from the second sound wave reflection device 3 is recorded as 2To. According to S=V×T and combined with the calculation formula in Step 2, the following calculation formula can be obtained: S2=Vi×Ti+(To-Ti)×Vo;

[0045] Step 4: After ultrasonic sensor 1 emits ultrasonic waves, the time it takes to receive the return from the target surface 4 is recorded as 2Tu. According to S=V×T and combined with the calculation formula in step 2, the following calculation formula can be obtained: S3=Vi×Ti+(Tu-Ti)×Vo;

[0046] Step 5: Combining the calculation formulas from Steps 2, 3, and 4, the following calculation formula can be derived:

[0047]

[0048] S1 and S2 are fixed known values.

[0049] Among them, reference Figure 1 In this embodiment, Ti, To, and Tu are all half of the round-trip time of the ultrasonic wave.

[0050] Specifically, 2Ti refers to twice the time of Ti; similarly, 2To and 2Tu refer to twice the time of To and twice the time of Tu, respectively; since Vo is affected by weather such as rain, snow, temperature, storms, etc., Vi and Vo have different speeds.

[0051] In summary, by placing the ultrasonic sensor 1 inside the protective cover 5, the ultrasonic speed inside the protective cover 5 is not affected by weather conditions such as rain, snow, temperature, and storms. By setting up the first sound wave reflection device 2 and the second sound wave reflection device 3, and introducing a new algorithm, the present invention solves the problem that the signal of the previous ultrasonic ranging device cannot be corrected because the speed of the signal is different when it propagates in different media. This improves the accuracy of the ultrasonic ranging device and makes the measurement results more accurate.

[0052] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of the present invention according to the circumstances without conflict or creative effort, thereby obtaining different technical solutions that do not fundamentally depart from the concept of the present invention. These technical solutions also fall within the scope of protection of the present invention.

Claims

1. A high-precision ultrasonic distance measuring device comprising an ultrasonic sensor (1), characterized in that, The ultrasonic sensor (1) is externally provided with a protective cover (5), the first sound wave reflection device (2) is installed on the protective cover (5), and the second sound wave reflection device (3) is arranged between the first sound wave reflection device (2) and the target surface (4) to be measured. An opening is formed on the protective cover (5), and the first sound wave reflection device (2) is installed on one side of the opening.

2. The high-precision ultrasonic distance measuring device according to claim 1, characterized in that It also includes a microprocessor and a display, and the microprocessor is connected with the display and the ultrasonic sensor (1) respectively.

3. The high-precision ultrasonic distance measuring device according to claim 2, characterized in that It also includes a wireless transmission module, which is connected with the microprocessor, and the microprocessor is connected with the external client through the wireless transmission module.

4. The high-precision ultrasonic distance measuring device according to claim 3, characterized in that The wireless transmission module is a Bluetooth module.

5. The distance measuring method of the high-precision ultrasonic distance measuring apparatus according to any one of claims 1 to 4, characterized by The specific steps are as follows: Step 1: the distance between the ultrasonic sensor (1) and the first sound wave reflection device (2) is recorded as S1, the distance between the ultrasonic sensor (1) and the second sound wave reflection device (3) is recorded as S2, the distance between the ultrasonic sensor (1) and the target surface (4) to be measured is recorded as S3, the ultrasonic velocity in the protective cover (5) is recorded as Vi, and the ultrasonic velocity outside the protective cover (5) is recorded as Vo; Step 2: after the ultrasonic sensor (1) emits ultrasonic waves, the time for receiving the return of the first sound wave reflection device (2) is recorded as 2Ti, and the following calculation formula can be obtained according to S=V×T: S1=Vi×Ti; Step 3: after the ultrasonic sensor (1) emits ultrasonic waves, the time for receiving the return of the second sound wave reflection device (3) is recorded as 2To, and the following calculation formula can be obtained according to S=V×T and combining the calculation formula in step 2: S2=Vi×Ti+(To-Ti)×Vo; Step 4: after the ultrasonic sensor (1) emits ultrasonic waves, the time for receiving the return of the target surface (4) to be measured is recorded as 2Tu, and the following calculation formula can be obtained according to S=V×T and combining the calculation formula in step 2: S3=Vi×Ti+(Tu-Ti)×Vo; Step 5: combining the calculation formulas in steps 2, 3 and 4, the following calculation formula can be obtained: Wherein, S1 and S2 are fixed known values.

6. The distance measuring method of the high-precision ultrasonic distance measuring apparatus according to claim 5, characterized by Ti, To and Tu are all half of the ultrasonic round trip time.

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