A single-probe ultrasonic distance measurement module and ultrasonic equipment

Abstract

The embodiment of the present invention discloses a single-probe ultrasonic ranging module and ultrasonic equipment. The ultrasonic ranging module includes an ultrasonic probe with a transceiver, a receiving amplifier circuit, a transceiver ranging circuit and a control circuit. When the control circuit receives a measurement instruction output by an external device, the transceiver ranging circuit is controlled to output an ultrasonic signal. The transceiver ultrasonic probe transmits a beam of ultrasonic pulses according to the ultrasonic signal. The ultrasonic probe converts the reflected echo into an ultrasonic signal and transmits it to the receiving amplifier circuit. The receiving amplifier circuit amplifies the ultrasonic signal and outputs an ultrasonic receiving signal. The transceiver ranging circuit outputs an ultrasonic round-trip ranging time signal to the control circuit according to the ultrasonic receiving signal. The control circuit calculates the distance value according to the ranging time signal and transmits it to the external device. Only one ultrasonic probe is needed to realize the transceiver of ultrasonic signals, which simplifies the device, can directly output the distance value to the user, and also saves the user's calculation time.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic distance measurement, and in particular to an ultrasonic distance measurement module and ultrasonic equipment with a single probe. Background Art

[0002] Traditional ultrasonic ranging modules are built with multiple chips or separate components. For example, the ultrasonic ranging module model US-015 can achieve non-contact ranging functions of 2cm to 4m. However, the US-015 ultrasonic ranging module is composed of two ultrasonic probes (one for sending and the other for receiving) and separate components. It cannot directly output the measured distance, but can only output digital signals. An external MCU is required to convert the digital signals into distance values. At the same time, the use of two ultrasonic probes is costly and the circuit is complex. In addition, the circuit board used to integrate the ultrasonic probes and separate components must be long enough to install the two ultrasonic probes, and the size of the circuit board cannot be reduced. Summary of the invention

[0003] In view of the above technical problems, the embodiments of the present invention provide an ultrasonic ranging module and an ultrasonic device with a single probe to solve the problem of high cost of existing ultrasonic ranging modules.

[0004] The embodiment of the present invention provides a single-probe ultrasonic ranging module connected to an external device, which includes an ultrasonic probe with a transceiver integrated, a receiving amplifier circuit, a transceiver ranging circuit and a control circuit; the ultrasonic probe is connected to the receiving amplifier circuit and the transceiver ranging circuit, the transceiver ranging circuit is connected to the receiving amplifier circuit and the control circuit, and the control circuit is connected to the external device;

[0005] When the control circuit receives the measurement instruction output by the peripheral device, it controls the transceiver distance measurement circuit to output an ultrasonic signal, and the transceiver integrated ultrasonic probe emits a beam of ultrasonic pulses according to the ultrasonic signal;

[0006] The ultrasonic probe converts the reflected echo into an ultrasonic signal and transmits it to the receiving amplifier circuit, which amplifies the ultrasonic signal and outputs an ultrasonic receiving signal. The transceiver distance measurement circuit outputs an ultrasonic round-trip distance measurement time signal to the control circuit according to the ultrasonic receiving signal.

[0007] The control circuit calculates the distance value according to the ranging time signal and transmits it to the peripheral device.

[0008] Optionally, in the single-probe ultrasonic ranging module, the cathode of the transceiver integrated ultrasonic probe is connected to the receiving amplifier circuit and the transceiver ranging circuit, and the anode of the ultrasonic probe is connected to the receiving amplifier circuit and the transceiver ranging circuit.

[0009] Optionally, in the single-probe ultrasonic ranging module, the receiving amplification circuit includes an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor and a third capacitor;

[0010] One end of the first resistor is connected to the negative electrode of the ultrasonic probe, the other end of the first resistor is connected to the inverting input end of the operational amplifier and one end of the third resistor, one end of the second resistor is connected to the positive electrode of the ultrasonic probe, the other end of the second resistor is connected to the non-inverting input end of the operational amplifier and one end of the fourth resistor, the output end of the operational amplifier is connected to the other end of the third resistor and one end of the first capacitor, the other end of the first capacitor is connected to one end of the second capacitor and the transceiver ranging circuit, the other end of the second capacitor is connected to one end of the third capacitor and the transceiver ranging circuit, and the other end of the third capacitor and the other end of the fourth resistor are both grounded.

[0011] Optionally, in the single-probe ultrasonic ranging module, the receiving amplification circuit further includes a fifth resistor, a sixth resistor, a fourth capacitor and a fifth capacitor;

[0012] The fifth resistor is connected in parallel with the third resistor, the fourth capacitor is connected in parallel with the fifth resistor, one end of the sixth resistor is connected to the other end of the second resistor and one end of the fourth resistor, the other end of the sixth resistor is connected to the power supply end, and the fifth capacitor is connected in parallel with the fourth resistor.

[0013] Optionally, in the single-probe ultrasonic ranging module, the transceiver ranging circuit includes a crystal oscillator, an ultrasonic ranging chip, a seventh resistor, a sixth capacitor and a seventh capacitor;

[0014] The RN pin of the ultrasonic ranging chip is connected to the other end of the second capacitor and one end of the third capacitor; the RP pin of the ultrasonic ranging chip is connected to the other end of the first capacitor and is also grounded through the seventh resistor; the TRIM1 pin, TRIM0 pin, ECHO pin, TRIG pin, BLIND0 pin, BLIND1 pin and BLIND2 pin of the ultrasonic ranging chip are all connected to the control circuit; the XO pin of the ultrasonic ranging chip is connected to one end of the crystal oscillator and one end of the sixth capacitor, the XI pin of the ultrasonic ranging chip is connected to the other end of the crystal oscillator and one end of the seventh capacitor, the other end of the sixth capacitor and the other end of the seventh capacitor are both grounded, the TN pin of the ultrasonic ranging chip is connected to the negative pole of the ultrasonic probe, the TP pin of the ultrasonic ranging chip is connected to the positive pole of the ultrasonic probe, the AVDD pin and DVDD pin of the ultrasonic ranging chip are both connected to the power supply end, and the AVSS pin and DVSS pin of the ultrasonic ranging chip are both grounded.

[0015] Optionally, in the single-probe ultrasonic ranging module, the control circuit includes a single-chip microcomputer and a serial port, and the P0.6 / AIN3 / TXD pin and P0.7 / AIN2 / RXD pin of the single-chip microcomputer are connected to the peripherals through the serial port; the P3.0 / AIN1 / OSCIN / INT0 pin, P1.7 / AIN0 / INT1 pin, SPCLK / IC2 / PWM2 / P1.0 pin, CL0 / AIN7 / IC1 / PWM1 / P1.1 pin, IC0 / PWM0 / P1.2 pin, SCL / P1.3 pin, PWM1 / FB / SDA / P1.4 pin of the single-chip microcomputer are connected one-to-one with the TRIG pin, ECHO pin, BLIND0 pin, BLIND1 pin, BLIND2 pin, TRIM0 pin, and TRIM1 pin of the ultrasonic ranging chip; the VDD pin of the single-chip microcomputer is connected to the power supply end, and the GND pin of the single-chip microcomputer is grounded.

[0016] A second aspect of an embodiment of the present invention provides an ultrasonic device, comprising an external device, and also comprising the single-probe ultrasonic ranging module, wherein the single-probe ultrasonic ranging module is connected to the external device via a serial port line;

[0017] The peripheral output control instruction sets the working parameters of the ultrasonic ranging module. The ultrasonic ranging module transmits a beam of ultrasonic pulses to the object to be measured according to the measurement instruction output by the peripheral, analyzes the reflected echo, obtains the corresponding distance value and transmits it to the peripheral.

[0018] In the technical solution provided by the embodiment of the present invention, the ultrasonic ranging module includes an ultrasonic probe with integrated transceiver, a receiving amplifier circuit, a transceiver ranging circuit and a control circuit; the ultrasonic probe is connected to the receiving amplifier circuit and the transceiver ranging circuit, the transceiver ranging circuit is connected to the receiving amplifier circuit and the control circuit, and the control circuit is connected to the peripheral device; when the control circuit receives the measurement instruction output by the peripheral device, it controls the transceiver ranging circuit to output an ultrasonic signal, and the ultrasonic probe with integrated transceiver emits a beam of ultrasonic pulses according to the ultrasonic signal; the ultrasonic probe converts the reflected echo into an ultrasonic signal and transmits it to the receiving amplifier circuit, the receiving amplifier circuit amplifies the ultrasonic signal and outputs an ultrasonic receiving signal, and the transceiver ranging circuit outputs an ultrasonic round-trip ranging time signal to the control circuit according to the ultrasonic receiving signal; the control circuit calculates the distance value according to the ranging time signal and transmits it to the peripheral device. Only one ultrasonic probe is needed to realize the transceiver of ultrasonic signals, which simplifies the device, can directly output the distance value to the user, and also saves the user's calculation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 4 is a structural block diagram of an ultrasonic device in an embodiment of the present invention.

[0020] Figure 2Schematic diagram of a receiving amplifier circuit in an ultrasonic ranging module in an embodiment of the present invention.

[0021] Figure 3 Schematic diagram of a circuit of a transceiver ranging circuit in an ultrasonic ranging module in an embodiment of the present invention.

[0022] Figure 4 Schematic diagram of a control circuit in an ultrasonic ranging module in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The embodiments of the present invention and all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1 The ultrasonic device provided by the embodiment of the present invention includes a single-probe ultrasonic ranging module and a peripheral device. The ultrasonic ranging module and the peripheral device are connected via a serial port line. The peripheral device outputs a control instruction to set the working parameters of the ultrasonic ranging module. The ultrasonic ranging module emits a beam of ultrasonic pulses to the object to be measured according to the measurement instruction output by the peripheral device, analyzes and processes the reflected echo, obtains the corresponding distance value and transmits it to the peripheral device.

[0025] The peripheral device may be a computer, or a single-chip microcomputer or a programmable logic controller that can input commands. The ultrasonic device includes all devices that need to measure distance, such as various robots (sweeping robots), aircraft, etc.

[0026] In this embodiment, the single-probe ultrasonic ranging module includes a circuit board, on which is integrated an ultrasonic probe RT with an integrated transceiver, a receiving amplifier circuit 10, a transceiver ranging circuit 20 and a control circuit 30; the ultrasonic probe RT is connected to the receiving amplifier circuit 10 and the transceiver ranging circuit 20, the transceiver ranging circuit 20 is connected to the receiving amplifier circuit 10 and the control circuit 30, and the control circuit 30 is connected to peripherals. The control circuit 30 sets the working parameters (such as sensitivity and blind time) of the transceiver distance measurement circuit 20 according to the control instruction input by the peripheral device, and outputs the ranging start signal Trig to the transceiver distance measurement circuit 20 when receiving the measurement instruction output by the peripheral device; the transceiver distance measurement circuit 20 outputs the ultrasonic signal (S_TN and S_TP) according to the ranging start signal Trig, and controls the transceiver integrated ultrasonic probe RT to transmit a beam of ultrasonic pulses to the measured object; the ultrasonic probe RT converts the received reflected echo into an ultrasonic signal and transmits it to the receiving amplifier circuit 10, and the receiving amplifier circuit 10 amplifies the ultrasonic signal and outputs the ultrasonic receiving signal (RP and RN), and the transceiver distance measurement circuit 20 outputs an ultrasonic round-trip ranging time signal to the control circuit 30 according to the ultrasonic receiving signal (RP and RN), and the control circuit 30 calculates the distance value according to the ranging time signal and transmits it to the peripheral device. Only one ultrasonic probe is needed to realize the transmission and reception of ultrasonic signals, which simplifies the device, and can directly output the distance value to the user, saving the user's calculation time.

[0027] The transceiver integrated ultrasonic probe RT is preferably of the type MSW-A1640H10TR or ZM-Sensor-A1640TR-W. Figure 2 and Figure 3 , the negative pole of the ultrasonic probe RT is connected to the receiving amplifier circuit 10 and the transceiver ranging circuit 20, and the positive pole of the ultrasonic probe RT is connected to the receiving amplifier circuit 10 and the transceiver ranging circuit 20. The transceiver ranging circuit 20 outputs an ultrasonic signal (S_TN and S_TP) to control the ultrasonic probe RT to transmit a beam of ultrasonic pulses to the object being measured, and the ultrasonic signal (S_TN and S_TP) at this time is used as a transmitting signal. The ultrasonic pulse (a kind of sound wave) is reflected by the surface of the object, and part of the reflected echo is received by the ultrasonic probe RT and converted into an ultrasonic signal (S_TN and S_TP), and the ultrasonic signal (S_TN and S_TP) at this time is used as a receiving signal. That is, the ultrasonic signal (S_TN and S_TP) is compatible with transmission and reception, and the transceiver integrated ultrasonic probe is equivalent to a sensor. When transmitting, the ultrasonic probe is used to generate sound waves, and when receiving sound waves, the ultrasonic probe is a receiving sensor.

[0028] Please continue reading Figure 2The receiving amplifier circuit 10 includes an operational amplifier U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first capacitor C1, a second capacitor C2 and a third capacitor C3; one end of the first resistor R1 is connected to the negative electrode of the ultrasonic probe RT, the other end of the first resistor R1 is connected to the inverting input end of the operational amplifier U1 and one end of the third resistor R3, one end of the second resistor R2 is connected to the positive electrode of the ultrasonic probe RT, the other end of the second resistor R2 is connected to the non-inverting input end of the operational amplifier U1 and one end of the fourth resistor R4, the output end of the operational amplifier U1 is connected to the other end of the third resistor R3 and one end of the first capacitor C1, the other end of the first capacitor C1 is connected to one end of the second capacitor C2 and the transceiver ranging circuit 20, the other end of the second capacitor C2 is connected to one end of the third capacitor C3 and the transceiver ranging circuit 20, and the other end of the third capacitor C3 and the other end of the fourth resistor R4 are both grounded. The power supply terminal (ie, the 5th pin) of the operational amplifier U1 is connected to the power supply terminal (providing the power supply voltage VCC), and the ground terminal (ie, the 2nd pin) of the operational amplifier U1 is grounded.

[0029] The operational amplifier U1 is preferably of the type LMV321. The ultrasonic probe RT converts the received reflected echo into an ultrasonic signal (S_TN and S_TP, such as a 40kHZ square wave), and R1-R4 and the operational amplifier U1 form a differential input configuration circuit to amplify the received ultrasonic signal (S_TN and S_TP), and then filter the first capacitor C1 to pass the AC and isolate the DC, and finally output the ultrasonic receiving signal (RP and RN, which are two 40KHZ square waves with different amplitudes) to the transceiver ranging circuit 20 after isolation and filtering by the second capacitor C2 and the third capacitor C3.

[0030] Preferably, the receiving amplifier circuit 10 further includes a fifth resistor R5, a sixth resistor R6, a fourth capacitor C4 and a fifth capacitor C5; the fifth resistor R5 is connected in parallel with the third resistor R3, the fourth capacitor C4 is connected in parallel with the fifth resistor R5, one end of the sixth resistor R6 is connected to the other end of the second resistor R2 and one end of the fourth resistor R4, the other end of the sixth resistor R6 is connected to the power supply end, and the fifth capacitor C5 is connected in parallel with the fourth resistor R4. The fourth capacitor C4 is used as a compensation capacitor for phase compensation, and the fifth capacitor C5 is used to introduce a positive feedback to strengthen the signal and increase the amplification factor.

[0031] Please continue reading Figure 3The transceiver ranging circuit 20 includes a crystal oscillator Y, an ultrasonic ranging chip U2, a seventh resistor R7, a sixth capacitor C6 and a seventh capacitor C7; the RN pin of the ultrasonic ranging chip U2 is connected to the other end of the second capacitor C2 and one end of the third capacitor C3; the RP pin of the ultrasonic ranging chip U2 is connected to the other end of the first capacitor C1 and is also grounded through the seventh resistor R7; the TRIM1 pin, TRIM0 pin, ECHO pin, TRIG pin, BLIND0 pin, BLIND1 pin and BLIND2 pin of the ultrasonic ranging chip U2 are all connected to the control circuit 30; the ultrasonic ranging chip U2 is connected to the control circuit 30; the ultrasonic ranging chip ... The XO pin of the ultrasonic ranging chip U2 is connected to one end of the crystal oscillator Y and one end of the sixth capacitor C6, the XI pin of the ultrasonic ranging chip U2 is connected to the other end of the crystal oscillator Y and one end of the seventh capacitor C7, the other end of the sixth capacitor C6 and the other end of the seventh capacitor C7 are both grounded, the TN pin of the ultrasonic ranging chip U2 is connected to the negative pole of the ultrasonic probe RT, the TP pin of the ultrasonic ranging chip U2 is connected to the positive pole of the ultrasonic probe RT, the AVDD pin and DVDD pin of the ultrasonic ranging chip U2 are both connected to the power supply end, and the AVSS pin and DVSS pin of the ultrasonic ranging chip U2 are both grounded.

[0032] Among them, the model of the ultrasonic ranging chip U2 is preferably CS102, which is used to generate ultrasonic signals and analyze the data in the ultrasonic receiving signal (RP and RN). The ultrasonic ranging chip only needs a single ultrasonic probe to realize the function of the existing two ultrasonic probes. The crystal oscillator Y provides an accurate clock for the ultrasonic ranging chip. The seventh resistor R7 is used as a pull-down resistor, and the RP of the ultrasonic ranging chip U2 is pulled down to a low level when there is no signal input to prevent the misjudgment of the interference signal, and can also play a role in adjusting the sensitivity. After the ultrasonic ranging chip U2 receives the ranging start signal Trig output by the control circuit 30, it outputs an ultrasonic signal (S_TN and S_TP, which are used as transmission signals at this time) to control the ultrasonic probe RT to transmit a beam of ultrasonic pulses to the object to be measured. After that, when the ultrasonic ranging chip U2 waits to receive the returned amplified ultrasonic receiving signal (RP and RN), it outputs an ultrasonic round-trip ranging time signal Echo to the control circuit 30, so that the control circuit 30 can calculate the actual distance value.

[0033] Since the ultrasonic probe RT, which is an integrated transmitter and receiver, only transmits when transmitting, it needs to wait for a period of time (preset value) after transmitting until the ultrasonic probe RT calms down. This period of time is the blind area of ​​the ultrasonic probe RT. It can only receive the reflected echo from the outside when no sound waves are generated. Figure 3In the figure, the high and low levels of the blind time signal (BLIND0, BLIND1, BLIND2) are used to set the blind time to shield the influence of aftershocks. BLIND0, BLIND1, and BLIND2 are set in a binary method, with the high level being 1 and the low level being 0. There are 8 combinations, namely 000, 001, 010, 011, 100, 101, 110, and 111. The larger the value, the larger the blind time and distance. For example, 111 represents the highest blind time, with a duration of 2.25ms and a blind distance of 382mm. 000 represents the lowest blind time, with both the duration and the blind distance being 0.

[0034] Please also read Figure 4 The control circuit 30 includes an 8-bit single-chip microcomputer U3 of the NE76003 series and a serial port (not shown in the figure, the serial port is a prior art and will not be described here). The P0.6 / AIN3 / TXD pin and the P0.7 / AIN2 / RXD pin of the single-chip microcomputer U3 are both connected to the external serial port; the P3.0 / AIN1 / OSCIN / INT0 pin, the P1.7 / AIN0 / INT1 pin, and the SPCLK / IC2 / PWM2 / P1. 0 pin, CL0 / AIN7 / IC1 / PWM1 / P1.1 pin, IC0 / PWM0 / P1.2 pin, SCL / P1.3 pin, PWM1 / FB / SDA / P1.4 pin are connected one-to-one with the TRIG pin, ECHO pin, BLIND0 pin, BLIND1 pin, BLIND2 pin, TRIM0 pin, and TRIM1 pin of the ultrasonic ranging chip U2; the VDD pin of the microcontroller U3 is connected to the power supply end, and the GND pin of the microcontroller U3 is grounded.

[0035] Among them, the P0.6 / AIN3 / TXD pin and P0.7 / AIN2 / RXD pin of the single-chip microcomputer U3 are externally connected to the serial port for communication, which is used to output the measured distance value to the peripheral device, and directly output the distance value to the user, saving the user's calculation time. When working, the user first sends a measurement instruction to the single-chip microcomputer U3 through the communication interface (P0.6 / AIN3 / TXD pin and P0.7 / AIN2 / RXD pin), and the single-chip microcomputer U3 outputs the ranging start signal Trig (a high-level pulse greater than 10us) to start the ranging function of the ultrasonic ranging chip U2; the ultrasonic ranging chip U2 outputs an ultrasonic signal (S_TN and S_TP) to control the ultrasonic probe RT to transmit a beam of ultrasonic pulses to the object to be measured, and then the ultrasonic ranging chip U2 waits to receive the returned ultrasonic signal and amplifies it through the operational amplifier U1, and outputs the ultrasonic receiving signal (RP and RN) to the ultrasonic ranging chip U2. The ultrasonic ranging chip U2 outputs an ultrasonic round-trip ranging time signal Echo to the single-chip microcomputer. The single-chip microcomputer can obtain the current distance value through calculation, and output the distance value to the user through the P0.6 / AIN3 / TXD pin and P0.7 / AIN2 / RXD pin.

[0036] The single-chip computer U3 also adjusts the sensitivity according to the sensitivity control instructions input by the user: for example, the single-chip computer U3 controls the sensitivity of the ultrasonic ranging chip U2 by outputting sensitivity signals (TRIM0, TRIM1) from the SCL / P1.3 pin and the PWM1 / FB / SDA / P1.4 pin according to the sensitivity control instructions input from the P0.6 / AIN3 / TXD pin and the P0.7 / AIN2 / RXD pin. When TRIM0 and TRIM1 are both 0, the sensitivity is the default value; when TRIM0 is 1 and TRIM1 is 0, the sensitivity is reduced by one level; when TRIM0 is 0 and TRIM1 is 1, the sensitivity is increased by one level; when both are 1, the sensitivity is reduced by two levels.

[0037] In summary, the single-probe ultrasonic ranging module and ultrasonic equipment provided by the present invention use an ultrasonic probe with an integrated transmitter and receiver and an ultrasonic ranging chip to achieve ranging. Only one ultrasonic probe is required, which greatly reduces the cost of components, simplifies the circuit, and reduces the size of the circuit board. It can also directly output the distance value without the need for user calculation, thus saving calculation time.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A single-probe ultrasonic ranging module, connected to an external device, characterized in that: It includes an ultrasonic probe with integrated transceiver, a receiving amplifier circuit, a transceiver ranging circuit and a control circuit; the ultrasonic probe is connected to the receiving amplifier circuit and the transceiver ranging circuit, the transceiver ranging circuit is connected to the receiving amplifier circuit and the control circuit, and the control circuit is connected to the peripheral device; When the control circuit receives the measurement instruction output by the peripheral device, it controls the transceiver distance measurement circuit to output an ultrasonic signal, and the transceiver integrated ultrasonic probe emits a beam of ultrasonic pulses according to the ultrasonic signal; The ultrasonic probe converts the reflected echo into an ultrasonic signal and transmits it to the receiving amplifier circuit, which amplifies the ultrasonic signal and outputs an ultrasonic receiving signal. The transceiver distance measurement circuit outputs an ultrasonic round-trip distance measurement time signal to the control circuit according to the ultrasonic receiving signal. The control circuit calculates the distance value according to the ranging time signal and transmits it to the peripheral device; The negative pole of the transceiver integrated ultrasonic probe is connected to the receiving amplifier circuit and the transceiver ranging circuit, and the positive pole of the ultrasonic probe is connected to the receiving amplifier circuit and the transceiver ranging circuit; The receiving amplifying circuit comprises an operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor, a second capacitor and a third capacitor; One end of the first resistor is connected to the negative electrode of the ultrasonic probe, the other end of the first resistor is connected to the inverting input end of the operational amplifier and one end of the third resistor, one end of the second resistor is connected to the positive electrode of the ultrasonic probe, the other end of the second resistor is connected to the non-inverting input end of the operational amplifier and one end of the fourth resistor, the output end of the operational amplifier is connected to the other end of the third resistor and one end of the first capacitor, the other end of the first capacitor is connected to one end of the second capacitor and the transceiver ranging circuit, the other end of the second capacitor is connected to one end of the third capacitor and the transceiver ranging circuit, and the other end of the third capacitor and the other end of the fourth resistor are both grounded.

2. The single-probe ultrasonic ranging module according to claim 1, characterized in that: The receiving amplifier circuit also includes a fifth resistor, a sixth resistor, a fourth capacitor and a fifth capacitor; The fifth resistor is connected in parallel with the third resistor, the fourth capacitor is connected in parallel with the fifth resistor, one end of the sixth resistor is connected to the other end of the second resistor and one end of the fourth resistor, the other end of the sixth resistor is connected to the power supply end, and the fifth capacitor is connected in parallel with the fourth resistor.

3. The single-probe ultrasonic ranging module according to claim 2, characterized in that: The transceiver distance measurement circuit includes a crystal oscillator, an ultrasonic distance measurement chip, a seventh resistor, a sixth capacitor and a seventh capacitor; The RN pin of the ultrasonic ranging chip is connected to the other end of the second capacitor and one end of the third capacitor; the RP pin of the ultrasonic ranging chip is connected to the other end of the first capacitor and is also grounded through the seventh resistor; the TRIM1 pin, TRIM0 pin, ECHO pin, TRIG pin, BLIND0 pin, BLIND1 pin and BLIND2 pin of the ultrasonic ranging chip are all connected to the control circuit; the XO pin of the ultrasonic ranging chip is connected to one end of the crystal oscillator and one end of the sixth capacitor, the XI pin of the ultrasonic ranging chip is connected to the other end of the crystal oscillator and one end of the seventh capacitor, the other end of the sixth capacitor and the other end of the seventh capacitor are both grounded, the TN pin of the ultrasonic ranging chip is connected to the negative pole of the ultrasonic probe, the TP pin of the ultrasonic ranging chip is connected to the positive pole of the ultrasonic probe, the AVDD pin and DVDD pin of the ultrasonic ranging chip are both connected to the power supply end, and the AVSS pin and DVSS pin of the ultrasonic ranging chip are both grounded.

4. The single-probe ultrasonic ranging module according to claim 3, characterized in that: The control circuit includes a single-chip microcomputer and a serial port, wherein the P0.6 / AIN3 / TXD pin and the P0.7 / AIN2 / RXD pin of the single-chip microcomputer are connected to the peripherals through the serial port; the P3.0 / AIN1 / OSCIN / INT0 pin, the P1.7 / AIN0 / INT1 pin, the SPCLK / IC2 / PWM2 / P1.0 pin, the CL0 / AIN7 / IC1 / PWM1 / P1.1 pin, the IC0 / PWM0 / P1.2 pin, the SCL / P1.3 pin, the PWM1 / FB / SDA / P1.4 pin of the single-chip microcomputer are connected one-to-one with the TRIG pin, the ECHO pin, the BLIND0 pin, the BLIND1 pin, the BLIND2 pin, the TRIM0 pin, and the TRIM1 pin of the ultrasonic ranging chip; The VDD pin of the microcontroller is connected to the power supply terminal, and the GND pin of the microcontroller is grounded.

5. An ultrasonic device, comprising a peripheral device, characterized in that: It also includes the single-probe ultrasonic ranging module according to any one of claims 1 to 4, wherein the single-probe ultrasonic ranging module is connected to the peripheral device via a serial port line; The peripheral output control instruction sets the working parameters of the ultrasonic ranging module. The ultrasonic ranging module transmits a beam of ultrasonic pulses to the object to be measured according to the measurement instruction output by the peripheral, analyzes the reflected echo, obtains the corresponding distance value and transmits it to the peripheral.

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