Dual frequency ultrasonic liquid level measuring device

Abstract

The utility model belongs to the technical field of measuring device, concretely relates to a kind of dual-frequency ultrasonic liquid level measuring device, can realize wide range (0.1~15 meters) and high-precision measurement to liquid level.Actual use, temperature measurer is inserted below liquid surface, and temperature signal detected in real time is sent to temperature compensation module, and temperature compensation module carries out sound velocity compensation to low-frequency ultrasonic wave and high-frequency ultrasonic wave respectively by existing calculation method.Low-frequency ultrasonic transducer and high-frequency ultrasonic transducer are close to liquid surface.Controller drives low-frequency ultrasonic transducer to emit low-frequency ultrasonic wave to liquid by low-frequency ultrasonic transducer drive module, and controller drives high-frequency ultrasonic transducer to emit high-frequency ultrasonic wave to liquid by high-frequency ultrasonic transducer drive module.Low-frequency echo signal receiver receives low-frequency echo signal, and high-frequency ultrasonic echo signal receiver receives high-frequency echo signal.

Description

Technical Field

[0001] This utility model belongs to the field of measuring device technology, specifically relating to a dual-frequency ultrasonic liquid level measuring device. Background Technology

[0002] Liquid level measurement is widely used in daily life, commonly found in waterworks, industrial transportation, lake and reservoir water level monitoring, and household water storage tanks. Traditional ultrasonic liquid level measuring devices often only achieve one of two ranges: a large range (typically 1–15 meters) or a small range (typically 0.1–3 meters). This is due to the inherent characteristics of ultrasonic transducers. According to relevant technical manuals for ultrasonic transducers, the driving voltage for low-frequency ultrasonic transducers (frequency 20–200 kHz) is relatively high (drive voltage > 400V). This high voltage results in a large dead zone in the echo signal (often greater than 0.5 meters). If the liquid level is low (less than 0.5 meters), a low-frequency ultrasonic transducer cannot achieve the desired measurement. Conversely, high-frequency ultrasonic transducers (frequency 1-2 MHz) require lower driving voltages (<150V) and have smaller dead zones in their echo signals (typically less than 0.05 meters). However, the high-frequency echo signals attenuate rapidly in liquids, limiting their maximum measurement range to generally no more than 3 meters. High-frequency ultrasonic transducers enable small-range measurements. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a dual-frequency ultrasonic liquid level measuring device that can achieve a wide range (0.1 to 15 meters) and high precision measurement of liquid level.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a dual-frequency ultrasonic liquid level measuring device, including a main housing, and a low-frequency ultrasonic transducer driving module, a high-frequency ultrasonic transducer driving module and a controller disposed within the main housing, as well as a low-frequency ultrasonic transducer, a low-frequency ultrasonic echo signal receiver, a high-frequency ultrasonic transducer and a high-frequency ultrasonic echo signal receiver disposed outside the main housing. The low-frequency ultrasonic transducer and the controller are electrically connected through a low-frequency ultrasonic transducer drive module; the high-frequency ultrasonic transducer and the controller are electrically connected through a high-frequency ultrasonic transducer drive module; both the low-frequency ultrasonic echo signal receiver and the high-frequency ultrasonic echo signal receiver are electrically connected to the controller. It also includes a temperature measuring device and a temperature compensation module; The temperature measuring device is located outside the main housing, and the temperature compensation module is located inside the main housing; the temperature measuring device, the temperature compensation module, and the controller are electrically connected in sequence.

[0005] Furthermore, it also includes a first housing disposed outside the main housing, wherein the low-frequency ultrasonic transducer and the low-frequency ultrasonic echo signal receiver are both disposed inside the first housing; the first housing is provided with a low-frequency ultrasonic emission window and a low-frequency ultrasonic echo entry window.

[0006] Furthermore, it also includes a second housing disposed outside the main housing, wherein the high-frequency ultrasonic transducer and the high-frequency ultrasonic echo signal receiver are both disposed inside the second housing; the second housing is provided with a high-frequency ultrasonic emission window and a high-frequency ultrasonic echo entry window.

[0007] Furthermore, it also includes a communication module disposed within the main housing, which is electrically connected to the controller. (ESP-01S module)

[0008] Furthermore, the temperature compensation module is integrated with the controller.

[0009] Furthermore, the low-frequency ultrasonic echo signal receiver includes a low-frequency echo signal limiting module, a low-frequency echo signal amplification module, a low-frequency echo signal bandpass filtering module, and a low-frequency echo signal envelope detection module disposed within the first housing; It also includes a low-frequency echo signal AD acquisition module disposed within the main housing; The low-frequency echo signal limiting module, low-frequency echo signal amplification module, low-frequency echo signal bandpass filtering module, low-frequency echo signal envelope detection module, and low-frequency echo signal AD acquisition module are electrically connected to the controller in sequence.

[0010] Furthermore, the low-frequency echo signal AD acquisition module is integrated with the controller.

[0011] Furthermore, the high-frequency ultrasonic echo signal receiver includes a high-frequency echo signal limiting module, a high-frequency echo signal amplification module, a high-frequency echo signal bandpass filtering module, and a high-frequency echo signal envelope detection module disposed within the second housing; It also includes a high-frequency echo signal AD acquisition module disposed within the main housing; The high-frequency echo signal limiting module, high-frequency echo signal amplification module, high-frequency echo signal bandpass filtering module, high-frequency echo signal envelope detection module, and high-frequency echo signal AD acquisition module are electrically connected to the controller in sequence.

[0012] Furthermore, the high-frequency echo signal AD acquisition module is integrated with the controller.

[0013] Furthermore, it also includes a display electrically connected to the controller, the display being embedded in the mounting window of the main housing.

[0014] Compared with existing technologies, the advantages of this invention are as follows: This invention provides a dual-frequency ultrasonic liquid level measuring device, capable of achieving wide-range (0.1-15 meters) and high-precision measurement of liquid levels. In actual use, the temperature measuring device is inserted below the liquid surface, sending the real-time detected liquid temperature data to the temperature compensation module. The temperature compensation module performs sound velocity compensation for both low-frequency and high-frequency ultrasonic waves using existing calculation methods. The low-frequency and high-frequency ultrasonic transducers are brought close to the liquid surface. The controller drives the low-frequency ultrasonic transducer to emit low-frequency ultrasonic waves into the liquid via the low-frequency ultrasonic transducer drive module, and the controller drives the high-frequency ultrasonic transducer to emit high-frequency ultrasonic waves into the liquid via the high-frequency ultrasonic transducer drive module. The low-frequency ultrasonic echo signal receiver receives the low-frequency echo signal, and the high-frequency ultrasonic echo signal receiver receives the high-frequency echo signal. This achieves wide-range (0.1-15 meters) and high-precision measurement of liquid depth. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is the circuit diagram of the STM32H750VBT6 in this utility model; Figure 3 This is a circuit diagram of the low-frequency ultrasonic transducer drive module of this utility model. Figure 4 This is a circuit diagram for low-frequency echo signal processing in this utility model; Figure 5 This is a circuit diagram of the medium-high frequency ultrasonic transducer drive module of this utility model; Figure 6 This is a circuit diagram for high-frequency echo signal processing in this utility model; Figure 7 This is a circuit diagram of the temperature compensation module in this utility model; Figure 8 This is the circuit diagram of the ESP-01S module in this utility model; Figure 9 This is the circuit diagram of the display in this utility model; Figure 10 This is the circuit diagram of buttons K1, K2 and K3 in this utility model; Figure label: 1-Main housing; 2-Low-frequency ultrasonic transducer drive module; 3-High-frequency ultrasonic transducer drive module; 4-Controller; 5-Low-frequency ultrasonic transducer; 6-Low-frequency ultrasonic echo signal receiver; 601-Low-frequency echo signal limiting module; 602-Low-frequency echo signal amplification module; 603-Low-frequency echo signal bandpass filter module; 604-Low-frequency echo signal envelope detector module; 7-First housing; 701-Low-frequency ultrasonic emission window; 702-Low-frequency ultrasonic echo entry window; 8-High-frequency ultrasonic transducer; 9- High-frequency ultrasonic echo signal receiver; 901-High-frequency echo signal limiting module; 902-High-frequency echo signal amplification module; 903-High-frequency echo signal bandpass filter module; 904-High-frequency echo signal envelope detector module; 10-Second housing; 1001-High-frequency ultrasonic wave emission window; 1002-High-frequency ultrasonic wave entry window; 11-Temperature measuring device; 12-Low-frequency echo signal AD acquisition module; 13-High-frequency echo signal AD acquisition module; 14-Temperature compensation module; 15-Display; 16-Communication module. Detailed Implementation

[0016] The following is in conjunction with the appendix Figures 1-10 The present invention will be further illustrated by the embodiments.

[0017] A dual-frequency ultrasonic liquid level measuring device includes a main housing 1, and a low-frequency ultrasonic transducer drive module 2, a high-frequency ultrasonic transducer drive module 3, and a controller 4 disposed within the main housing 1, and a low-frequency ultrasonic transducer 5, a low-frequency ultrasonic echo signal receiver 6, a high-frequency ultrasonic transducer 8, and a high-frequency ultrasonic echo signal receiver 9 disposed outside the main housing 1; the low-frequency ultrasonic transducer 5 and the controller 4 are electrically connected through the low-frequency ultrasonic transducer drive module 2; the high-frequency ultrasonic transducer 8 and the controller 4 are electrically connected through the high-frequency ultrasonic transducer drive module 3; the low-frequency ultrasonic echo signal receiver 6 and the high-frequency ultrasonic echo signal receiver 9 are both electrically connected to the controller 4; it also includes a temperature measuring device 11 and a temperature compensation module 14; the temperature measuring device 11 is disposed outside the main housing 1, and the temperature compensation module 14 is disposed inside the main housing 1; the temperature measuring device 11, the temperature compensation module 14, and the controller 4 are sequentially electrically connected.

[0018] The main housing 1 provides mounting support for the low-frequency ultrasonic transducer drive module 2, the high-frequency ultrasonic transducer drive module 3, and the controller 4. In actual use, the temperature measuring device 11 extends below the liquid surface, sending the real-time detected liquid temperature data to the temperature compensation module 14. The temperature compensation module 14 performs sound velocity compensation for the low-frequency and high-frequency ultrasonic waves using existing calculation methods. The low-frequency ultrasonic transducer 5 and the high-frequency ultrasonic transducer 8 are brought close to the liquid surface. The controller 4 drives the low-frequency ultrasonic transducer 5 to emit low-frequency ultrasonic waves into the liquid via the low-frequency ultrasonic transducer drive module 2, and drives the high-frequency ultrasonic transducer 8 to emit high-frequency ultrasonic waves into the liquid via the high-frequency ultrasonic transducer drive module 3. The low-frequency ultrasonic echo signal receiver 6 receives the low-frequency echo signal, and the high-frequency ultrasonic echo signal receiver 9 receives the high-frequency echo signal. This enables wide-range (0.1–15 meters) and high-precision measurement of liquid depth.

[0019] Preferably, the temperature measuring device 11 is a DS18B20 temperature sensor.

[0020] Preferably, the system further includes a first housing 7 disposed outside the main housing 1, wherein the low-frequency ultrasonic transducer 5 and the low-frequency ultrasonic echo signal receiver 6 are both disposed within the first housing 7; the first housing 7 is provided with a low-frequency ultrasonic emission window 701 and a low-frequency ultrasonic echo entry window 702. The first housing 7 provides mounting support for the low-frequency ultrasonic transducer 5 and the low-frequency ultrasonic echo signal receiver 6.

[0021] Preferably, the system further includes a second housing 10 disposed outside the main housing 1, wherein the high-frequency ultrasonic transducer 8 and the high-frequency ultrasonic echo signal receiver 9 are both disposed within the second housing 10; the second housing 10 is provided with a high-frequency ultrasonic emission window 1001 and a high-frequency ultrasonic echo entry window 1002. The second housing 10 provides mounting support for the high-frequency ultrasonic transducer 8 and the high-frequency ultrasonic echo signal receiver 9.

[0022] Preferably, the system further includes a communication module 16 disposed within the main housing 1, which is electrically connected to the controller 4. By providing the communication module 16, the controller 4 can send liquid level data and liquid temperature data to an external storage device, such as cloud storage.

[0023] The communication module 16 can be a Bluetooth module. Specifically, the communication module 16 is an ESP-01S module.

[0024] Preferably, the temperature compensation module 14 is integrated with the controller 4.

[0025] Preferably, the low-frequency ultrasonic echo signal receiver 6 includes a low-frequency echo signal limiting module 601, a low-frequency echo signal amplification module 602, a low-frequency echo signal bandpass filter module 603, and a low-frequency echo signal envelope detector module 604 disposed within the first housing 7; it also includes a low-frequency echo signal AD acquisition module 12 disposed within the main housing 1; the low-frequency echo signal limiting module 601, low-frequency echo signal amplification module 602, low-frequency echo signal bandpass filter module 603, low-frequency echo signal envelope detector module 604, and low-frequency echo signal AD acquisition module 12 are electrically connected to the controller 4 in sequence. The low-frequency ultrasonic echo signal is limited by the low-frequency echo signal limiting module 601, amplified by the low-frequency echo signal amplification module 602, filtered by the low-frequency echo signal bandpass filter module 603, detected by the low-frequency echo signal envelope detector module 604, and finally acquired by the low-frequency echo signal AD acquisition module 12.

[0026] Preferably, the low-frequency echo signal AD acquisition module 12 is integrated with the controller 4.

[0027] Preferably, the high-frequency ultrasonic echo signal receiver 9 includes a high-frequency echo signal limiting module 901, a high-frequency echo signal amplification module 902, a high-frequency echo signal bandpass filter module 903, and a high-frequency echo signal envelope detector module 904 disposed within the second housing 10; it also includes a high-frequency echo signal AD acquisition module 13 disposed within the main housing 1; the high-frequency echo signal limiting module 901, high-frequency echo signal amplification module 902, high-frequency echo signal bandpass filter module 903, high-frequency echo signal envelope detector module 904, and high-frequency echo signal AD acquisition module 13 are sequentially electrically connected to the controller 4. The high-frequency ultrasonic echo signal is limited by the high-frequency echo signal limiting module 901, amplified by the high-frequency echo signal amplification module 902, filtered by the high-frequency echo signal bandpass filter module 903, detected by the high-frequency echo signal envelope detector module 904, and finally acquired by the high-frequency echo signal AD acquisition module 13.

[0028] Preferably, the high-frequency echo signal AD acquisition module 13 is integrated with the controller 4.

[0029] Preferably, the system also includes a display 15 electrically connected to the controller 4, which is embedded in the mounting window of the main housing 1. The controller 4 sends liquid level data to the display 15 for liquid level display. The temperature measuring device 11 sends real-time detected liquid temperature data to the controller 4, which then sends the liquid temperature data to the display 15 for temperature display. The controller 4 communicates with the ESP-01S module. The ESP-01S module has pre-configured its network with the Alibaba Cloud IoT platform (including Wi-Fi connection parameter configuration, Alibaba Cloud IoT platform device certificate entry, and data transmission protocol adaptation). After receiving the liquid level and liquid temperature data sent by the controller 4, the ESP-01S module encapsulates the liquid temperature and liquid level data into standard data frames according to the preset MQTT communication protocol and uploads them to a designated topic on the Alibaba Cloud IoT platform via the Wi-Fi network. The Alibaba Cloud IoT platform then receives, parses, and persistently stores the data, enabling remote traceability and management of the data. Simultaneously, the Alibaba Cloud IoT platform can also issue liquid level measurement commands to the controller 4 to achieve ultra-long-range liquid level measurement.

[0030] Preferably, buttons K1, K2, and K3 are also provided on the main housing 1. Button K1 is electrically connected to the high-frequency ultrasonic transducer drive module 3. Pressing button K1 starts the high-frequency ultrasonic transducer 8 to emit high-frequency ultrasonic waves. If the high-frequency echo signal does not pass through the high-frequency ultrasonic echo signal receiver 9 and is not ultimately acquired by the high-frequency echo signal AD acquisition module 13 on the controller 4 after a certain period of time (e.g., 10 seconds, 20 seconds), the controller 4 starts the low-frequency ultrasonic transducer 5 to emit low-frequency ultrasonic waves through the low-frequency ultrasonic transducer drive module 2. The Alibaba Cloud IoT platform only needs to issue a single drive command to drive the high-frequency ultrasonic transducer 8 and the low-frequency ultrasonic transducer 5. Buttons K2 and K3 are both electrically connected to the controller 4. Pressing button K2 sends the liquid level data and liquid temperature data to the storage module built into the controller 4. Pressing button K3 sends the liquid level data and liquid temperature data to the Alibaba Cloud IoT platform.

[0031] Preferably, the display 15 is an LED display.

[0032] Controller 4 can be a microcontroller or a programmable logic controller (PLC). Preferably, controller 4 is an STM32 controller. The model of controller 4 is STM32H750VBT6.

[0033] This device uses a 24V lithium battery as a portable power source to power various components, and a power adapter to power various components in scenarios requiring long-term power supply.

[0034] The specific embodiments described are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. All equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A dual-frequency ultrasonic liquid level measuring device, characterized in that: Includes a main housing (1), and a low-frequency ultrasonic transducer drive module (2), a high-frequency ultrasonic transducer drive module (3) and a controller (4) disposed within the main housing (1), and a low-frequency ultrasonic transducer (5), a low-frequency ultrasonic echo signal receiver (6), a high-frequency ultrasonic transducer (8) and a high-frequency ultrasonic echo signal receiver (9) disposed outside the main housing (1). The low-frequency ultrasonic transducer (5) and the controller (4) are electrically connected through the low-frequency ultrasonic transducer drive module (2); the high-frequency ultrasonic transducer (8) and the controller (4) are electrically connected through the high-frequency ultrasonic transducer drive module (3); the low-frequency ultrasonic echo signal receiver (6) and the high-frequency ultrasonic echo signal receiver (9) are both electrically connected to the controller (4). It also includes a temperature measuring device (11) and a temperature compensation module (14). The temperature measuring device (11) is located outside the main housing (1), and the temperature compensation module (14) is located inside the main housing (1); the temperature measuring device (11), the temperature compensation module (14) and the controller (4) are electrically connected in sequence.

2. The dual-frequency ultrasonic liquid level measuring device as described in claim 1, characterized in that: It also includes a first housing (7) disposed outside the main housing (1), wherein the low-frequency ultrasonic transducer (5) and the low-frequency ultrasonic echo signal receiver (6) are both disposed inside the first housing (7); the first housing (7) is provided with a low-frequency ultrasonic emission window (701) and a low-frequency ultrasonic echo entry window (702).

3. The dual-frequency ultrasonic liquid level measuring device as described in any one of claims 1-2, characterized in that: It also includes a second housing (10) disposed outside the main housing (1), wherein the high-frequency ultrasonic transducer (8) and the high-frequency ultrasonic echo signal receiver (9) are both disposed inside the second housing (10); the second housing (10) is provided with a high-frequency ultrasonic emission window (1001) and a high-frequency ultrasonic echo entry window (1002).

4. The dual-frequency ultrasonic liquid level measuring device as described in claim 1, characterized in that: It also includes a communication module (16) disposed within the main housing (1), the communication module (16) being electrically connected to the controller (4).

5. The dual-frequency ultrasonic liquid level measuring device as described in claim 1, characterized in that: The temperature compensation module (14) is integrated with the controller (4).

6. The dual-frequency ultrasonic liquid level measuring device as described in claim 2, characterized in that: The low-frequency ultrasonic echo signal receiver (6) includes a low-frequency echo signal limiting module (601), a low-frequency echo signal amplification module (602), a low-frequency echo signal bandpass filtering module (603), and a low-frequency echo signal envelope detection module (604) disposed in the first housing (7). It also includes a low-frequency echo signal AD acquisition module (12) disposed within the main housing (1); The low-frequency echo signal limiting module (601), low-frequency echo signal amplification module (602), low-frequency echo signal bandpass filtering module (603), low-frequency echo signal envelope detection module (604), low-frequency echo signal AD acquisition module (12) and controller (4) are electrically connected in sequence.

7. The dual-frequency ultrasonic liquid level measuring device as described in claim 6, characterized in that: The low-frequency echo signal AD acquisition module (12) is integrated with the controller (4).

8. The dual-frequency ultrasonic liquid level measuring device as described in claim 3, characterized in that: The high-frequency ultrasonic echo signal receiver (9) includes a high-frequency echo signal limiting module (901), a high-frequency echo signal amplification module (902), a high-frequency echo signal bandpass filtering module (903), and a high-frequency echo signal envelope detection module (904) disposed in the second housing (10). It also includes a high-frequency echo signal AD acquisition module (13) disposed within the main housing (1); The high-frequency echo signal limiting module (901), high-frequency echo signal amplification module (902), high-frequency echo signal bandpass filtering module (903), high-frequency echo signal envelope detection module (904), high-frequency echo signal AD acquisition module (13) and controller (4) are electrically connected in sequence.

9. The dual-frequency ultrasonic liquid level measuring device as described in claim 8, characterized in that: The high-frequency echo signal AD acquisition module (13) is integrated with the controller (4).

10. The dual-frequency ultrasonic liquid level measuring device as described in claim 1, characterized in that: It also includes a display (15) electrically connected to the controller (4), the display (15) being embedded in the mounting window of the main housing (1).

Images