High-precision ultrasonic ranging device and method

Abstract

The invention relates to the technical field of ultrasonic ranging, and particularly discloses a high-precision ultrasonic ranging device and method.The high-precision ultrasonic ranging device comprises an ultrasonic sensor, a protective cover is arranged outside the ultrasonic sensor, a first sound wave reflection device is installed on the protective cover, and a second sound wave reflection device is arranged between the first sound wave reflection device and a to-be-measured target surface. According to the invention, the ultrasonic sensor is arranged in the protective cover, so that the sound velocity of ultrasonic waves in the protective cover is not affected by weather such as rain and snow, air temperature and storm, and a new algorithm is introduced by arranging the first sound wave reflection device and the second sound wave reflection device. The problem that speed correction cannot be carried out due to different propagation speeds of signals of the conventional ultrasonic distance measuring device in different media is solved, so that the precision of the ultrasonic distance measuring device is improved, and the measurement result is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic distance measurement, and in particular to a high-precision ultrasonic distance measurement device and method. Background Art

[0002] Ultrasonic distance measurement is a technology that has been studied for many years, and there are related products. These products and technologies are sufficient for general distance measurement, and can reach the centimeter or even millimeter level. However, when it is used for higher-precision measurement, it is necessary to consider the speed at which ultrasonic waves propagate in different media.

[0003] A Chinese patent with a prior art application publication number of CN111175757A discloses a high-precision ultrasonic rangefinder, which adds a sound wave reflection device of a standard distance in front of a test device. After the ultrasonic sensor sends out an ultrasonic wave, the ultrasonic wave is received at a time T1 when the standard distance device returns the ultrasonic wave, and a time T2 when the object being measured returns the ultrasonic wave. Since the distance of the standard distance device is certain, the current accurate speed V of the ultrasonic wave is calculated according to the return time of the standard device, and then the accurate distance S (S=V×T2) of the object being measured is calculated according to the calculated speed V and the time T2 when the object being measured returns the ultrasonic wave, that is, S2=(S1÷T1)×T2, which can completely avoid the test being affected by the ambient temperature and the density of the air, and the measurement result is more accurate.

[0004] The above method is sufficient under normal circumstances. However, when taking into account high-precision ranging, the speed of ultrasound is not constant under different weather conditions. At this time, it is necessary to consider the speed correction when ultrasound passes through different media, so as 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] In view of the deficiencies in the prior art, the present invention aims to provide a high-precision ultrasonic distance measurement device and method.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A high-precision ultrasonic distance measuring device comprises an ultrasonic sensor. A protective cover is arranged outside the ultrasonic sensor. A first sound wave reflecting device is installed on the protective cover. A second sound wave reflecting device is arranged between the first sound wave reflecting device and a target surface to be measured.

[0009] Furthermore, an opening is provided on the protective cover, 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, wherein the microprocessor is 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 is connected 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 are as follows:

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

[0015] Step 2: After the ultrasonic sensor sends out the ultrasonic wave, the time it takes to receive the first sound wave reflection device’s return is recorded as 2Ti. According to S=V×T, the following calculation formula can be obtained: S1=Vi×Ti;

[0016] Step 3: After the ultrasonic sensor sends out the ultrasonic wave, the time it takes to receive the return signal from the second sound wave reflection device is recorded as 2To. According to S=V×T and 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 sends out ultrasonic waves, the time it takes to receive the return signal from the target surface to be measured is recorded as 2Tu. According to S=V×T and 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 in steps 2, 3, and 4, the following calculation formula can be obtained:

[0019]

[0020] Among them, S1 and S2 are fixed known values.

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

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

[0023] The present invention arranges an ultrasonic sensor in a protective cover so that the ultrasonic sound velocity in the protective cover will not be affected by weather conditions such as rain, snow, temperature, storms, etc., and arranges a first sound wave reflecting device and a second sound wave reflecting device, and introduces a new algorithm to solve the problem that the signal of the previous ultrasonic ranging device has different speeds when propagating in different media and cannot perform speed correction, thereby improving the accuracy of the ultrasonic ranging device and making the measurement result more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Markings in the figure: 1. ultrasonic sensor; 2. first sound wave reflecting device; 3. second sound wave reflecting device; 4. target surface to be measured; 5. protective cover. DETAILED DESCRIPTION

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

[0027] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method 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", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The embodiment of the present invention provides a high-precision ultrasonic distance measuring device, referring to Figure 1, comprising an ultrasonic sensor 1, a protective cover 5 is provided outside the ultrasonic sensor 1, a first sound wave reflecting device 2 is installed on the protective cover 5, and a second sound wave reflecting device 3 is provided between the first sound wave reflecting device 2 and a target surface 4 to be measured.

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

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

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

[0034] In this embodiment, a microprocessor and a display are further included, and 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 display screen.

[0036] In this embodiment, a wireless transmission module is further included, and 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 the test results to other devices such as mobile phones.

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

[0040] The structural components and principles of the ultrasonic sensor 1, microprocessor, display, DC / DC converter and Bluetooth module are all prior art. The algorithm of the present 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 are as follows:

[0042] Step 1: The distance between the ultrasonic sensor 1 and the first sound wave reflecting device 2 is recorded as S1, the distance between the ultrasonic sensor 1 and the second sound wave reflecting 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 sound velocity inside the protective cover 5 is recorded as Vi, and the ultrasonic sound velocity outside the protective cover 5 is recorded as Vo;

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

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

[0045] Step 4: After the ultrasonic sensor 1 sends out the ultrasonic wave, the time it takes to receive the return signal from the target surface 4 to be measured is recorded as 2Tu. According to S=V×T and 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 in steps 2, 3, and 4, the following calculation formula can be obtained:

[0047]

[0048] Among them, S1 and S2 are fixed known values.

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

[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, storm, etc., the speeds of Vi and Vo are different.

[0051] In summary, the present invention arranges the ultrasonic sensor 1 in the protective cover 5 so that the ultrasonic sound velocity in the protective cover 5 will not be affected by weather conditions such as rain, snow, temperature, storms, etc., and arranges the first sound wave reflecting device 2 and the second sound wave reflecting device 3, and introduces a new algorithm to solve the problem that the signal of the previous ultrasonic ranging device has different speeds when propagating in different media and the speed correction cannot be performed, thereby improving the accuracy of the ultrasonic ranging device and making the measurement result more accurate.

[0052] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work 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, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also belong to 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 provided with a protective cover (5) on the outside, a first sound wave reflection device (2) is installed on the protective cover (5), and a second sound wave reflection device (3) is provided between the first sound wave reflection device (2) and the target surface (4) to be measured.

2. The high-precision ultrasonic distance measuring device according to claim 1, characterized in that: The protective cover (5) is provided with an opening, and a first sound wave reflecting device (2) is installed on one side of the opening.

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

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

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

6. A high-precision ultrasonic ranging method, characterized in that: The specific steps are as follows: Step 1: The distance between the ultrasonic sensor (1) and the first sound wave reflecting device (2) is recorded as S1, the distance between the ultrasonic sensor (1) and the second sound wave reflecting 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 sound velocity inside the protective cover (5) is recorded as Vi, and the ultrasonic sound velocity outside the protective cover (5) is recorded as Vo; Step 2: After the ultrasonic sensor (1) emits ultrasonic waves, the time it takes to receive the return sound from the first sound wave reflection device (2) is recorded as 2Ti. According to S=V×T, the following calculation formula can be obtained: S1=Vi×Ti; Step 3: After the ultrasonic sensor (1) emits ultrasonic waves, the time it takes to receive the return sound from the second sound wave reflection device (3) is recorded as 2To. According to S=V×T and the calculation formula in step 2, the following calculation formula can be obtained: S2=Vi×Ti+(To-Ti)×Vo; Step 4: After the ultrasonic sensor (1) emits ultrasonic waves, the time it takes to receive the return signal from the target surface (4) to be measured is recorded as 2Tu. According to S=V×T and the calculation formula in step 2, the following calculation formula can be obtained: 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: Among them, S1 and S2 are fixed known values.

7. The high-precision ultrasonic distance measurement method according to claim 6, characterized in that: Ti, To and Tu are all half of the ultrasonic round trip time.

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