An ultrasonic measurement module

Abstract

This invention relates to an ultrasonic measurement module, comprising an ultrasonic chip for transmitting and receiving ultrasonic signals, and a processing circuit for processing signals related to the time difference between transmitted and received ultrasonic waves output by the ultrasonic chip. Both the ultrasonic chip and the processing circuit are mounted on a circuit board. An ultrasonic output guiding device is disposed outside the ultrasonic chip, having a chip-accommodating space for accommodating the ultrasonic chip soldered to the circuit board. An ultrasonic transceiver port, corresponding to the ultrasonic transceiver oscillator on the ultrasonic chip, is located at the top of the chip-accommodating space. In this invention, the ultrasonic output guiding device outside the ultrasonic chip limits the ultrasonic emission angle by utilizing the tilt of the ultrasonic transceiver port, thereby limiting the measurement range.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic sensors, and in particular to an ultrasonic measurement module with controllable measurement range. Background Technology

[0002] An ultrasonic measurement module, also known as an ultrasonic sensor, uses an ultrasonic transceiver to transmit and receive ultrasonic waves of a specific frequency to measure the distance to a target within a specific range. The basic principle of an ultrasonic measurement module is based on the known speed of sound in air. It measures the time it takes for the sound wave to reflect back from an obstacle after being emitted, and calculates the actual distance from the emission point to the obstacle (the measurement target) based on the time difference between emission and reception. In practice, the ultrasonic transceiver module is integrated onto a single chip, called an ultrasonic chip. This chip contains an ultrasonic transceiver oscillator that emits ultrasonic signals and receives the reflected ultrasonic waves from the target. It then outputs the time difference between the two signals, and finally processes this time data within the chip to determine the distance to the target.

[0003] Utility Model Patent Publication No. CN 206056725 U discloses a dedicated ultrasonic probe for a liquid-medium ultrasonic level measuring instrument. This ultrasonic probe includes an ultrasonic probe housing, a piezoelectric ceramic, a matching layer, and a lead wire. The lead wire is fixedly connected to the piezoelectric ceramic. A sound-absorbing layer is disposed below the piezoelectric ceramic and fixedly connected to its lower end face. A shielding layer is disposed on the sidewall of the piezoelectric ceramic and outside the sound-absorbing layer. An isolation layer is disposed outside the lead wire and fixedly connected to copper foil. The matching layer is fixedly connected to the upper end face of the piezoelectric ceramic. The matching layer is fixedly connected to the upper end face of the ultrasonic probe housing. A backing is disposed inside the ultrasonic probe housing, and the piezoelectric ceramic, sound-absorbing layer, and shielding layer are placed inside the backing. The lead wire passes through the sound-absorbing layer, shielding layer, and backing, with its lower end exiting the ultrasonic probe housing through a hole. In such an ultrasonic measurement module probe, because the ultrasonic transceiver (piezoelectric ceramic) is directly exposed, the ultrasonic waves are emitted in all directions, resulting in energy concentration, making it unsuitable for measuring a specific measurement area. Summary of the Invention

[0004] The purpose of this invention is to provide an ultrasonic measurement module that uses an ultrasonic output guiding device to guide the ultrasonic waves generated by the ultrasonic chip to a set emission angle for emission, thereby achieving measurement in a designated area.

[0005] The technical solution adopted by this utility model is as follows: an ultrasonic measurement module, including an ultrasonic chip for transmitting and receiving ultrasonic signals, and a processing circuit for processing the signals related to the time difference between transmitted and received ultrasonic waves output by the ultrasonic chip; the ultrasonic chip and the processing circuit are both mounted on a circuit board; an ultrasonic output guiding device is provided outside the ultrasonic chip, the ultrasonic output guiding device has a chip receiving space for accommodating the ultrasonic chip soldered on the circuit board, and an ultrasonic transceiver port corresponding to the ultrasonic transceiver oscillator on the ultrasonic chip is provided at the top of the chip receiving space.

[0006] Furthermore, in the aforementioned ultrasonic measurement module, the ultrasonic chip and the processing circuit are respectively disposed on both sides of the circuit board.

[0007] Furthermore, in the aforementioned ultrasonic measurement module: the ultrasonic transceiver port is funnel-shaped, and the wall of the ultrasonic transceiver port is arc-shaped. The arc surface of the ultrasonic transceiver port wall (312) forms an angle of -60° to 90° with the ultrasonic chip (110) and the vertical line.

[0008] Furthermore, in the aforementioned ultrasonic measurement module: the ultrasonic output guiding device covers the ultrasonic chip on the circuit board, and a fixing screw hole is provided on the contact surface with the circuit board.

[0009] Furthermore, the aforementioned ultrasonic measurement module also includes an ultrasonic transceiver cavity, which is connected to the ultrasonic transceiver port.

[0010] Furthermore, in the aforementioned ultrasonic measurement module: the ultrasonic transceiver cavity is in the shape of a long horn, and the taper of the horn is between 5 and 15 degrees.

[0011] Furthermore, in the aforementioned ultrasonic measurement module: a circular interface for installing the ultrasonic transceiver cavity is provided on the ultrasonic transceiver cavity and the ultrasonic transceiver port; when the ultrasonic transceiver cavity is installed into the circular interface, an annular washer is also provided.

[0012] Furthermore, in the aforementioned ultrasonic measurement module, an annular protrusion is provided on the outer side of the end of the ultrasonic transceiver cavity to facilitate installation of the ultrasonic measurement module.

[0013] In this invention, an ultrasonic output guiding device is provided outside the ultrasonic chip, and the ultrasonic emission angle is limited by the tilt of the ultrasonic transceiver port, thereby limiting the measurement range.

[0014] The present invention will be described in more detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Appendix Figure 1 This is a three-dimensional view of the ultrasonic measurement module of this utility model;

[0016] Appendix Figure 2 This is an exploded view of the ultrasonic measurement module of this utility model;

[0017] Appendix Figure 3 This is a structural diagram (I) of the ultrasonic output guiding device in this utility model embodiment;

[0018] Appendix Figure 4 This is a structural diagram (II) of the ultrasonic output guiding device in this utility model embodiment;

[0019] Appendix Figure 5 This is a cross-sectional view (a) of the ultrasonic output guiding device in this embodiment of the present invention.

[0020] Appendix Figure 6 This is a cross-sectional view (a) of the ultrasonic output guiding device in an embodiment of this utility model. Detailed Implementation

[0021] This embodiment is an ultrasonic measurement module. This module can be used to measure the distance between a target and an ultrasonic transducer within a set range. Figure 1 and Figure 2 As shown, the ultrasonic measurement module is mounted on a circuit board 100, including an ultrasonic chip 110 with an ultrasonic transceiver soldered to the lower side of the circuit board 100, and a processing circuit soldered to the upper side of the circuit board 100 to process the output signal of the ultrasonic chip. The processing circuit processes the data (time difference signal between ultrasonic transmission and reception) generated by the ultrasonic chip to generate a chart reflecting the distance between target objects within a set range for use by other devices. Here, the ultrasonic chip is an externally purchased module; it is a powerful chip with ultrasonic transmitting and receiving transceivers, etc. The chip uses circuitry and algorithms to obtain the distance between various objects within the measurement range and the transceiver. It is generally a rectangular chip, differing from ordinary chips in that it has ultrasonic transceivers on the back. In this embodiment, since the required ultrasonic measurement range is limited, an ultrasonic output guiding device 300 is provided outside the ultrasonic chip 110, such as... Figure 3 , 4As shown in Figures 5 and 6, the ultrasonic output guiding device 300 has a chip receiving space 310 for accommodating an ultrasonic chip 110 soldered onto a circuit board 100. An ultrasonic transceiver port 311, corresponding to the ultrasonic transceiver oscillator 111 on the ultrasonic chip 110, is located at the top of the chip receiving space 310. The ultrasonic transceiver port 311 is flared, and its wall 312 is arc-shaped. The angle between the arc surface of the ultrasonic transceiver port wall 312 and the ultrasonic chip 110 and the vertical line is -60° to 90°. Figure 5 and Figure 6 The diagram shows two schematic representations of this angle, which is essentially the angle between the tangent of the arc and the perpendicular line. The ultrasonic output guide device 300 covers the ultrasonic chip 110 on the circuit board 100. A fixing screw hole 321 is provided on the contact surface 320 with the circuit board 100. In this embodiment, the ultrasonic chip 110 and the processing circuit are installed on both sides of the circuit board 100, respectively. When installed on a beverage machine, the ultrasonic chip 110 is installed on both sides of the circuit board 100; therefore, the ultrasonic output guide device 300 is positioned with its bottom against the circuit board 100. For ease of encapsulation, two screws are used to secure it in the fixing screw hole 321.

[0022] In this embodiment, to ensure the controllable range of the ultrasonic measuring device, an ultrasonic transceiver cavity 200 is also included, which is connected to the ultrasonic transceiver port 311. In this embodiment, the ultrasonic transceiver cavity 200 is morning glory-shaped, i.e., a long trumpet shape. A circular interface 313 for mounting the ultrasonic transceiver cavity 200 is provided on the ultrasonic transceiver cavity 200 and the ultrasonic transceiver port 311. When the ultrasonic transceiver cavity 200 is mounted onto the circular interface 313, an annular washer 330 is also provided. Figure 2 As shown.

[0023] In this embodiment, an annular protrusion 210 is provided on the outer side of the end of the ultrasonic transceiver cavity 200 to facilitate the installation of the ultrasonic measurement module. In this embodiment, the tube diameter at the upper end of the ultrasonic transceiver cavity 200 is 8mm and the length is 25mm. In practice, the dimensions of the ultrasonic transceiver cavity 200 can be between 5-10mm in diameter and 20-30mm in length at the upper end. The ultrasonic transceiver cavity 200 is conical with an isosceles trapezoidal cross-section. The angle between the waist and the central axis can be between 5-15 degrees, which is the taper of the horn.

[0024] In this embodiment, an ultrasonic transceiver cavity 200 with a long, horn-shaped opening is used to limit the radiation surface of the ultrasonic transducer. Its main function is as follows:

[0025] Focused sound waves: The shape of the long horn helps to concentrate ultrasonic energy in a specific direction, forming a narrower beam of sound waves. This improves the directivity of the sound waves, allowing the ultrasonic waves to propagate more accurately to the target object, reducing sound wave scattering, and thus improving the precision and accuracy of the measurement.

[0026] Enhanced transmission and reception: A suitable horn design allows for better matching with the ultrasonic transducer, enabling the transducer to more effectively convert electrical energy into acoustic energy when emitting ultrasonic waves and radiate the acoustic energy in a specific direction. When receiving reflected ultrasonic waves, it can also more efficiently convert acoustic energy into electrical energy, improving reception sensitivity.

[0027] Transducer protection: The horn-shaped structure can protect the internal ultrasonic transducer components to a certain extent, preventing them from being directly impacted and damaged by external objects. It can also play a certain role in dust and moisture protection, ensuring the normal working environment of the transducer.

Claims

1. An ultrasonic measurement module, comprising an ultrasonic chip for transmitting and receiving ultrasonic signals, and a processing circuit for processing signals related to the time difference between transmitted and received ultrasonic waves output by the ultrasonic chip; the ultrasonic chip and the processing circuit are both mounted on a circuit board (100); characterized in that: An ultrasonic output guiding device (300) is provided outside the ultrasonic chip (110). The ultrasonic output guiding device (300) has a chip receiving space (310) for accommodating the ultrasonic chip soldered on the circuit board (100). An ultrasonic transceiver port (311) corresponding to the ultrasonic transceiver transducer (111) on the ultrasonic chip (110) is provided at the top of the chip receiving space (310).

2. The ultrasonic measurement module according to claim 1, characterized in that: The ultrasonic chip (110) and the processing circuit are respectively disposed on both sides of the circuit board (100).

3. The ultrasonic measurement module according to claim 1, characterized in that: The ultrasonic transceiver port (311) is shaped like a trumpet, and the port wall (312) of the ultrasonic transceiver port is arc-shaped.

4. The ultrasonic measurement module according to claim 3, characterized in that: The ultrasonic output guide device (300) covers the ultrasonic chip (110) on the circuit board (100), and a fixing screw hole (321) is provided on the contact surface (320) with the circuit board (100).

5. The ultrasonic measurement module according to claim 4, characterized in that: It also includes an ultrasonic transceiver cavity (200), which is connected to the ultrasonic transceiver port (311).

6. The ultrasonic measurement module according to claim 5, characterized in that: The ultrasonic transceiver cavity (200) is in the shape of a long horn, and the taper of the horn is between 5 and 15 degrees.

7. The ultrasonic measurement module according to claim 6, characterized in that: On the ultrasonic transceiver cavity (200), the ultrasonic transceiver port (311) is provided with a circular interface (313) for installing the ultrasonic transceiver cavity (200). When the ultrasonic transceiver cavity (200) is installed into the circular interface (313), an annular washer (330) is also provided.

8. The ultrasonic measurement module according to claim 7, characterized in that: An annular protrusion (210) is provided on the outer side of the end of the ultrasonic transceiver cavity (200) to facilitate the installation of the ultrasonic measurement module.

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