CN220019875U - Distance detection circuit and device - Google Patents
Distance detection circuit and device Download PDFInfo
- Publication number
- CN220019875U CN220019875U CN202320987694.7U CN202320987694U CN220019875U CN 220019875 U CN220019875 U CN 220019875U CN 202320987694 U CN202320987694 U CN 202320987694U CN 220019875 U CN220019875 U CN 220019875U
- Authority
- CN
- China
- Prior art keywords
- resistor
- operational amplifier
- gate
- input end
- ultrasonic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 36
- 239000003990 capacitor Substances 0.000 claims description 40
- 239000000523 sample Substances 0.000 claims description 31
- 238000007493 shaping process Methods 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 6
- 230000005284 excitation Effects 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 238000013016 damping Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Landscapes
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The utility model discloses a distance detection circuit and a device, and relates to the technical field of distance measurement. Compared with the traditional ultrasonic ranging circuit, the ultrasonic ranging circuit has higher driving capability under the excitation of the same voltage, and meanwhile, the circuit has small loss in the process of energy conversion (converting electric energy into acoustic energy) and high precision.
Description
Technical Field
The present utility model relates to the field of ranging technologies, and in particular, to a distance detection circuit and a device.
Background
The current means for ranging mainly include: microwave radar ranging, laser ranging and ultrasonic ranging. The fatal defects of microwave radar ranging and laser ranging are that the technical difficulty is high, the cost is high, and therefore the application is limited to a certain extent, while compared with microwave radar ranging and laser ranging, ultrasonic ranging has the advantages of small technical difficulty, low cost, wider application range, low sensitivity to external electromagnetic fields, light rays and colors, suitability for severe environments with strong electromagnetic interference, darkness, smoke or dust, and more advantages in identifying objects with poor diffuse reflectivity and transparency, and is particularly suitable for remote measurement. In addition, the ultrasonic detection is convenient, simple and can be controlled in real time, especially in the application of air ranging, the transmission speed is low, the information is easy to detect, and the resolution ratio is high, so that the application of ultrasonic ranging is more and more wide. However, the existing ultrasonic ranging circuit has the problem of low precision, and cannot meet the requirements of high-precision measurement.
Disclosure of Invention
The utility model aims to provide a distance detection circuit and a distance detection device, which solve the problem of low precision of an ultrasonic ranging circuit in the prior art.
In order to solve the technical problems, the utility model adopts the following technical scheme:
an aspect of the present utility model provides a distance detection circuit, where the distance detection circuit includes an ultrasonic transmitting circuit, an ultrasonic receiving circuit, and a main control unit, the ultrasonic transmitting circuit and the ultrasonic receiving circuit are both connected with the main control unit, the ultrasonic transmitting circuit is configured to send an ultrasonic signal to a measured object, the ultrasonic receiving circuit is configured to receive an echo signal sent by the ultrasonic transmitting circuit after the ultrasonic wave is sent to the measured object, and transmit the received ultrasonic echo signal to the main control unit, and the ultrasonic transmitting circuit includes: the ultrasonic transmitter comprises a time base module, a first resistor, a first capacitor, a first rheostat, a first NOT gate, a second NOT gate, a third NOT gate, a fourth NOT gate, a fifth NOT gate, a second resistor, a third resistor, an inductor and an ultrasonic transmitting probe, wherein the reset end of the time base module is connected with a main control unit, the power supply end of the time base module is connected with the discharge end of the time base module through the first rheostat, the discharge end of the time base module is connected with the first end of the first capacitor through the first resistor, the second end of the first capacitor is grounded, the output end of the time base module is connected with the input end of the first NOT gate and the input end of the fourth NOT gate, the output end of the first NOT gate is connected with the input end of the second NOT gate and the input end of the third NOT gate, the output end of the second NOT gate is connected with the output end of the fourth NOT gate through the second resistor, and the output end of the third NOT gate is connected with the output end of the fifth NOT gate.
In some embodiments, the distance detection circuit further includes a temperature compensation circuit, the temperature compensation circuit includes a fourth resistor, a voltage regulator tube, a fifth resistor, a second varistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first operational amplifier, a second operational amplifier, and a temperature sensor, a first end of the temperature sensor is connected to a power supply, a second end of the temperature sensor is grounded through the seventh resistor, a non-inverting input end of the second operational amplifier is connected to a second end of the temperature sensor, an output end of the second operational amplifier is connected to an inverting input end of the second operational amplifier through the eighth resistor, a non-inverting input end of the first operational amplifier is grounded through the ninth resistor, a first end of the fourth resistor is connected to a cathode of the voltage regulator tube, an anode of the temperature sensor is grounded through the seventh resistor, a non-inverting input end of the second operational amplifier is connected to a non-inverting input end of the second operational amplifier through the eighth resistor, a non-inverting input end of the second operational amplifier is connected to a non-inverting input end of the first operational amplifier through the eighth resistor, a non-inverting input end of the first operational amplifier is connected to a non-inverting input end of the fourth resistor.
In some embodiments, the ultrasonic receiving circuit includes an ultrasonic receiving probe, a third capacitor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a third operational amplifier, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor and a fourth operational amplifier, wherein a first end of the ultrasonic receiving probe is connected to a first end of the twelfth resistor through the third capacitor, a second end of the ultrasonic receiving probe is grounded, a first end of the eleventh resistor is connected to a first end of the twelfth resistor, a second end of the eleventh resistor is grounded, a second end of the twelfth resistor is connected to a non-inverting input end of the third operational amplifier, an inverting input end of the third operational amplifier is grounded through the thirteenth resistor, an output end of the third operational amplifier is connected to an inverting input end of the third operational amplifier through the fourteenth resistor, an output end of the third operational amplifier is connected to a non-inverting input end of the fourth operational amplifier through the fifteenth resistor, an inverting input end of the fourth operational amplifier is connected to a seventeenth input end of the fourth operational amplifier through the fourth operational amplifier.
In some embodiments, the distance detection circuit further includes a filter circuit, where the filter circuit is disposed between the output end of the fourth operational amplifier and the main control unit, and is used for filtering out interference signals.
In some embodiments, the distance detection circuit further includes a shaping circuit disposed between the filtering circuit and the master control unit for improving accuracy of distance detection.
In some embodiments, the filter circuit includes a nineteenth resistor, a fifth capacitor, a sixth capacitor, a twentieth resistor, a twenty-first resistor, a fifth operational amplifier, a twenty-second resistor, and a twenty-third resistor, wherein a first end of the nineteenth resistor is connected to an output end of the fourth operational amplifier, a second end of the nineteenth resistor is grounded through the fifth capacitor, a second end of the nineteenth resistor is connected to an in-phase input end of the fifth operational amplifier through the sixth capacitor, an in-phase input end of the fifth operational amplifier is grounded through the twentieth resistor, an inverting input end of the fifth operational amplifier is grounded through the twenty-second resistor, an output end of the fifth operational amplifier is connected to an inverting input end of the fifth operational amplifier through the twenty-third resistor, and an output end of the fifth operational amplifier is connected to the second end of the nineteenth resistor through the twenty-first resistor.
In some embodiments, the shaping circuit includes a fourth capacitor, a sixth not gate, a seventh not gate, and an eighteenth resistor, where a first end of the fourth capacitor is connected to the output end of the fifth operational amplifier, a second end of the fourth capacitor is connected to the input end of the sixth not gate, an output end of the sixth not gate is connected to the input end of the seventh not gate, an output end of the seventh not gate is connected to the master control unit, and an input end of the sixth not gate is connected to the output end of the seventh not gate through the eighteenth resistor.
An aspect of an embodiment of the present utility model provides a distance detection device including a distance detection circuit as described above.
According to the distance detection circuit and the distance detection device provided by the embodiment of the utility model, the distance detection circuit and the distance detection device have at least the following beneficial effects: when ranging is needed, the main control unit outputs a high-level signal to the reset end of the time base module, the output end of the time base module outputs a 40kHz pulse signal, the pulse signal is divided into two paths, one path is inverted through a first NOT gate, then is connected in parallel through a second NOT gate and a third NOT gate and then is added to the first end of the ultrasonic transmitting probe, the other path is connected in parallel through a fourth NOT gate and a fifth NOT gate and then is added to the second end of the ultrasonic transmitting probe, at this time, the voltage added to the two ends of the ultrasonic transmitting probe is a bipolar pulse signal with opposite phases, the voltage at the two ends of the ultrasonic transmitting probe is 2 times of the power supply voltage, the driving capability of an ultrasonic transmitting circuit is improved, and the ultrasonic transmitting probe is used for transmitting ultrasonic signals. The second and third NOT gates and the fourth and fifth NOT gates are connected in parallel, increasing the drive current. The second resistor and the third resistor have the functions of increasing the damping effect of the ultrasonic transmitting probe to improve the capacity of the ultrasonic transmitting probe with load, and the inductor has the functions of forming a resonant circuit, and matching the circuit in a series resonance mode (impedance is shown as a minimum value when the resonance matching is carried out) so as to minimize the loss of energy in the circuit. Compared with the traditional ultrasonic ranging circuit, the ultrasonic ranging circuit has higher driving capability under the excitation of the same voltage, and meanwhile, the circuit has small loss in the process of energy conversion (converting electric energy into acoustic energy) and high precision.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a circuit schematic of an ultrasound transmit circuit according to an embodiment;
FIG. 2 is a schematic circuit diagram of a temperature compensation circuit according to an embodiment;
FIG. 3 is a circuit schematic of an ultrasound receiving circuit according to an embodiment;
FIG. 4 is a circuit schematic of a filter circuit according to an embodiment;
fig. 5 is a circuit schematic of a shaping circuit according to an embodiment.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", or a third "may explicitly or implicitly include one or more such feature.
In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted.
The following is a brief description of the technical solution of the embodiment of the present utility model:
according to some embodiments, as shown in fig. 1, the present utility model provides a distance detection circuit, where the distance detection circuit includes an ultrasonic transmitting circuit, an ultrasonic receiving circuit, and a main control unit, the ultrasonic transmitting circuit and the ultrasonic receiving circuit are both connected to the main control unit, the ultrasonic transmitting circuit is configured to send an ultrasonic signal to an object to be detected, the ultrasonic receiving circuit is configured to receive an echo signal sent by the ultrasonic transmitting circuit after the ultrasonic wave is sent to the object to be detected, and transmit the received ultrasonic echo signal to the main control unit, and the ultrasonic transmitting circuit includes:
the ultrasonic transmission device comprises a time base module U1, a first resistor R1, a first capacitor C1, a first rheostat RP1, a first NOT gate U2, a second NOT gate U3, a third NOT gate U4, a fourth NOT gate U5, a fifth NOT gate U6, a second resistor R2, a third resistor R3, an inductor L1 and an ultrasonic transmission probe LS1, wherein the reset end of the time base module U1 is connected with a main control unit, the power supply end of the time base module U1 is connected with the discharge end of the time base module U1 through the first rheostat RP1, the discharge end of the time base module U1 is connected with the first end of the first capacitor C1 through the first resistor R1, the second end of the first capacitor C1 is grounded, the output end of the time base module U1 is connected with the input end of the first NOT gate U2 and the input end of the fourth NOT gate U5, the output end of the first NOT gate U2 is connected with the input end of the third NOT gate U3 and the output end of the third NOT gate U4, the output end of the second NOT gate U3 is connected with the output end of the fourth NOT gate U5, the output end of the third NOT gate U3 is connected with the output end of the fourth NOT gate U5, the output end of the third NOT gate U1 is connected with the output end of the fourth NOT gate 5.
Based on the above embodiment, during ranging, the ultrasonic transmitting circuit is used for transmitting an ultrasonic signal to the object to be measured, the ultrasonic receiving circuit is used for receiving an echo signal of the transmitted ultrasonic wave and transmitting the received ultrasonic signal to the main control unit, and the main control unit calculates and judges the distance between the object from which the ultrasonic wave is transmitted and the object to be measured by the time from the transmission of the ultrasonic signal to the reception of the echo signal.
In order to achieve sufficient accuracy in ultrasonic ranging, the accuracy of the frequency of ultrasonic output needs to be ensured, for this purpose, a multivibrator circuit is formed by a time base module U1, and is used for generating a pulse signal with a stable frequency of 40kHz, and the frequency of the pulse signal can be changed by changing the parameters of a first rheostat RP1, a first resistor R1 and a first capacitor C1.
Specifically, the working principle of the ultrasonic transmitting circuit is as follows: when the main control unit outputs a low-level signal to the reset end (RST pin) of the time base module U1, the output end (OUT pin) of the time base module U1 outputs the low-level signal, and the ultrasonic transmitting probe LS1 does not work. When ranging is needed, the main control unit outputs a high-level signal to the reset end (RST pin) of the time base module U1, the output end (OUT pin) of the time base module U1 outputs a 40kHz pulse signal, the pulse signal is divided into two paths, one path is inverted by the first NOT gate U2 and then is added to the first end of the ultrasonic emission probe LS1 after being connected in parallel by the second NOT gate U3 and the third NOT gate U4, the other path is added to the second end of the ultrasonic emission probe LS1 after being connected in parallel by the fourth NOT gate U5 and the fifth NOT gate U6, at this time, the voltage added to the two ends of the ultrasonic emission probe LS1 is a bipolar pulse signal with opposite phases, the voltage at the two ends of the ultrasonic emission probe LS1 is 2 times of the power supply voltage, the driving capability of the ultrasonic emission circuit is improved, and the ultrasonic emission probe LS1 is used for emitting ultrasonic signals. The second and third not gates U3 and U4 and the fourth and fifth not gates U5 and U6 are connected in parallel in order to increase the driving current.
The second resistor R2 and the third resistor R3 are used for increasing the damping effect of the ultrasonic transmitting probe LS1 to improve the load capacity, and the inductor L1 is used for forming a resonant circuit, so that in order to realize resonance matching, the excitation of the ultrasonic transmitting probe LS1 belongs to the excitation of a constant voltage source, and therefore the circuit is matched in a series resonance mode (impedance is shown as a minimum value during resonance matching), so that the loss of energy in the circuit is reduced to the minimum.
Compared with the traditional ultrasonic ranging circuit, the ultrasonic transmitting circuit has higher driving capability under the excitation of the same voltage, and meanwhile, the circuit has small loss in the process of energy conversion (converting electric energy into acoustic energy) and high precision.
Preferred embodiments of the present disclosure are further elaborated below in conjunction with figures 2-5 of the present description.
According to some embodiments, as shown in fig. 2, the distance detection circuit further includes a temperature compensation circuit, where the temperature compensation circuit includes a fourth resistor R4, a regulator tube D1, a fifth resistor R5, a second resistor RP2, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a first operational amplifier U7, a second operational amplifier U8, and a temperature sensor U9, a first end of the temperature sensor U9 is connected to a power supply, a second end of the temperature sensor U9 is connected to the ground through the seventh resistor R7, a non-inverting input end of the second operational amplifier U8 is connected to a second end of the temperature sensor U9, an output end of the second operational amplifier U8 is connected to an inverting input end of the first operational amplifier U7 through the eighth resistor R8, a first end of the first operational amplifier U7 is connected to the positive electrode of the second resistor R4 through the fourth resistor R7, a non-inverting input end of the second operational amplifier U7 is connected to the positive electrode of the fourth resistor R7 through the fifth resistor R4, a non-inverting input end of the second operational amplifier U8 is connected to the positive electrode of the fourth resistor R2 through the fourth resistor R7, and an output end of the fourth resistor R2 is connected to the positive electrode of the fourth resistor R2.
Based on the above embodiments, in the ultrasonic ranging circuit, factors affecting the ranging accuracy are many, including environmental interference, pulse frequency, etc., but the influence of the environmental temperature on the sound velocity is the largest, and therefore, the influence of the temperature cannot be ignored, and it is necessary to measure and compensate the temperature so as not to affect the measuring accuracy.
In the utility model, the temperature sensor U9 is used for detecting the ambient temperature and converting the detected temperature signal into a current signal, the current signal is converted into a voltage signal through the seventh resistor R7, the voltage is added to the non-inverting input end of the second operational amplifier U8, and the second operational amplifier U8 forms a follower to play a role in signal isolation. The electric signal output by the temperature sensor U9 is weak, in order to better identify the ambient temperature, the detected temperature signal is amplified, the first operational amplifier U7 forms a differential amplifying circuit, the voltage isolated by the second operational amplifier U8 is transmitted to the non-inverting input end of the first operational amplifier U7, the fourth resistor R4, the voltage stabilizing tube D1 and the second rheostat RP2 form a voltage stabilizing circuit, the magnitude of the stabilizing voltage can be changed by adjusting the resistance value of the second rheostat RP2, the stabilizing voltage is used as a reference voltage to be added to the inverting input end of the first operational amplifier U7, the voltage is amplified by the first operational amplifier U7 and then transmitted to the main control unit, and the main control unit carries out distance measurement precision compensation according to the detected temperature value.
According to some embodiments, as shown in fig. 3, the ultrasonic receiving circuit includes an ultrasonic receiving probe LS2, a third capacitor C3, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a third operational amplifier U10, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, and a fourth operational amplifier U11, wherein a first end of the ultrasonic receiving probe LS2 is connected to a first end of the twelfth resistor R12 through the third capacitor C3, a second end of the ultrasonic receiving probe LS2 is grounded, a first end of the eleventh resistor R11 is connected to a first end of the twelfth resistor R12, a second end of the eleventh resistor R11 is grounded, a second end of the twelfth resistor R12 is connected to an in-phase input end of the third operational amplifier U10, an inverting input end of the third operational amplifier U10 is grounded through the thirteenth resistor R16, an output end of the third operational amplifier U10 is connected to an inverting end of the fourth operational amplifier U11 through the fourteenth resistor R14, an inverting input end of the fourth operational amplifier U11 is connected to an in-phase input end of the fourth operational amplifier U11 through the inverting end of the thirteenth resistor R10, and an inverting input end of the fifteenth operational amplifier U10 is connected to the inverting input end of the fourth operational amplifier U11.
Based on the above embodiment, the ultrasonic receiving probe LS2 is configured to receive an echo signal of an ultrasonic wave, convert the received echo signal of the ultrasonic wave into an electrical signal and output the electrical signal, and the electrical signal is filtered by the third capacitor C3 and then added to the in-phase input end of the third operational amplifier U10, where the electrical signal output by the ultrasonic receiving probe LS2 is weak and cannot be directly recognized by the main control unit, so that the electrical signal needs to be amplified, the third operational amplifier U10 forms an amplifying circuit, the amplified electrical signal is sent to the in-phase input end of the fourth operational amplifier U11, the fourth operational amplifier U11 forms a second-stage amplifying circuit, and if only one-stage amplifying circuit is provided, the feedback resistance and the resistance of the input resistance of the amplifying circuit are all large, and the resistance of the resistance is also the larger, so that in order to improve the accuracy of ultrasonic ranging, the two-stage amplifying circuit is adopted to amplify the electrical signal output by the ultrasonic receiving probe LS2, and finally the amplified signal is sent to the main control unit.
According to some embodiments, the distance detection circuit further includes a filter circuit, which is disposed between the output end of the fourth operational amplifier U11 and the main control unit, for filtering out interference signals.
Further, as shown in fig. 4, the filter circuit includes a nineteenth resistor R19, a fifth capacitor C5, a sixth capacitor C6, a twenty-first resistor R21, a fifth operational amplifier U14, a twenty-second resistor R22, and a twenty-third resistor R23, where a first end of the nineteenth resistor R19 is connected to the output end of the fourth operational amplifier U11, a second end of the nineteenth resistor R19 is grounded through the fifth capacitor C5, a second end of the nineteenth resistor R19 is connected to the non-inverting input end of the fifth operational amplifier U14 through the sixth capacitor C6, the non-inverting input end of the fifth operational amplifier U14 is grounded through the twenty-second resistor R20, an inverting input end of the fifth operational amplifier U14 is grounded through the twenty-second resistor R22, an output end of the fifth operational amplifier U14 is connected to the output end of the fifth operational amplifier U14 through the twenty-third resistor R23, and an inverting input end of the fifth operational amplifier U14 is connected to the twenty-first end of the nineteenth resistor R21.
Based on the above embodiment, during the process of receiving the ultrasonic echo signal by the ultrasonic receiving probe LS2, some other interference signals are received at the same time, if the interference signals are not filtered, the accuracy of ultrasonic ranging will be seriously affected, and for this purpose, a filter circuit is added in the present utility model.
The nineteenth resistor R19, the fifth capacitor C5, the sixth capacitor C6, the twentieth resistor R20, the twenty-first resistor R21, the fifth operational amplifier U14, the twenty-second resistor R22 and the twenty-third resistor R23 form a second-order band-pass filter circuit for filtering high-frequency clutter and noise signals in the signals.
According to some embodiments, the distance detection circuit further comprises a shaping circuit, and the shaping circuit is arranged between the filtering circuit and the main control unit, so as to improve the accuracy of distance detection.
Further, as shown in fig. 5, the shaping circuit includes a fourth capacitor C4, a sixth not gate U12, a seventh not gate U13, and an eighteenth resistor R18, where a first end of the fourth capacitor C4 is connected to an output end of the fifth operational amplifier U14, a second end of the fourth capacitor C4 is connected to an input end of the sixth not gate U12, an output end of the sixth not gate U12 is connected to an input end of the seventh not gate U13, an output end of the seventh not gate U13 is connected to the master control unit, and an input end of the sixth not gate U12 is connected to an output end of the seventh not gate U13 through the eighteenth resistor R18.
Based on the above embodiment, the echo signal received by the main control unit is a square wave pulse signal, and although the filtered ultrasonic echo signal filters the interference signal in the signal, the waveform of the echo signal is irregular.
According to some embodiments, the present utility model provides a distance detection device comprising a distance detection circuit as described above.
In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
While the present disclosure has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration rather than of limitation. As the present disclosure may be embodied in several forms without departing from the spirit or essential attributes thereof, it should be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the metes and bounds of the claims, or equivalences of such metes and bounds are therefore intended to be embraced by the appended claims.
Claims (8)
1. The utility model provides a distance detection circuit, its characterized in that, distance detection circuit includes ultrasonic emission circuit, ultrasonic receiving circuit and master control unit, ultrasonic emission circuit and ultrasonic receiving circuit all with master control unit is connected, ultrasonic emission circuit is used for sending ultrasonic wave signal to the testee, ultrasonic receiving circuit is used for receiving ultrasonic emission circuit sends the echo signal behind ultrasonic wave to the testee to transmit the ultrasonic wave echo signal that receives to master control unit, ultrasonic emission circuit includes:
the ultrasonic transmitter comprises a time base module, a first resistor, a first capacitor, a first rheostat, a first NOT gate, a second NOT gate, a third NOT gate, a fourth NOT gate, a fifth NOT gate, a second resistor, a third resistor, an inductor and an ultrasonic transmitting probe, wherein the reset end of the time base module is connected with a main control unit, the power supply end of the time base module is connected with the discharge end of the time base module through the first rheostat, the discharge end of the time base module is connected with the first end of the first capacitor through the first resistor, the second end of the first capacitor is grounded, the output end of the time base module is connected with the input end of the first NOT gate and the input end of the fourth NOT gate, the output end of the first NOT gate is connected with the input end of the second NOT gate and the input end of the third NOT gate, the output end of the second NOT gate is connected with the output end of the fourth NOT gate through the second resistor, and the output end of the third NOT gate is connected with the output end of the fifth NOT gate.
2. The distance detection circuit according to claim 1, further comprising a temperature compensation circuit, wherein the temperature compensation circuit comprises a fourth resistor, a voltage regulator tube, a fifth resistor, a second varistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first operational amplifier, a second operational amplifier and a temperature sensor, wherein a first end of the temperature sensor is connected to a power supply, a second end of the temperature sensor is grounded through the seventh resistor, a non-inverting input end of the second operational amplifier is connected to a second end of the temperature sensor, an output end of the second operational amplifier is connected to an inverting input end of the second operational amplifier, an output end of the second operational amplifier is connected to a non-inverting input end of the first operational amplifier through the eighth resistor, a non-inverting input end of the first operational amplifier is grounded through the ninth resistor, a first end of the fourth resistor is connected to a power supply, a second end of the fourth resistor is connected to a cathode of the temperature sensor is grounded through the seventh resistor, a non-inverting input end of the second operational amplifier is connected to a second end of the fourth resistor is connected to a positive end of the fourth resistor, and a non-inverting input end of the second operational amplifier is connected to a non-inverting input end of the first operational amplifier.
3. The distance detection circuit according to claim 1, wherein the ultrasonic receiving circuit comprises an ultrasonic receiving probe, a third capacitor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a third operational amplifier, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor and a fourth operational amplifier, wherein a first end of the ultrasonic receiving probe is connected to a first end of the twelfth resistor through the third capacitor, a second end of the ultrasonic receiving probe is grounded, a first end of the eleventh resistor is connected to a first end of the twelfth resistor, a second end of the eleventh resistor is grounded, a second end of the twelfth resistor is connected to an in-phase input end of the third operational amplifier, an inverting input end of the third operational amplifier is grounded through the thirteenth resistor, an output end of the third operational amplifier is connected to an inverting input end of the third operational amplifier through the fourteenth resistor, an output end of the third operational amplifier is connected to an inverting input end of the fourth operational amplifier through the fifteenth resistor, an output end of the fourth operational amplifier is connected to an inverting input end of the fourth operational amplifier through the inverting input end of the fourth operational amplifier.
4. A distance detection circuit according to claim 3, further comprising a filter circuit arranged between the output of the fourth operational amplifier and the main control unit for filtering out interference signals.
5. The distance detection circuit according to claim 4, further comprising a shaping circuit disposed between the filter circuit and the main control unit for improving accuracy of distance detection.
6. The distance detection circuit according to claim 5, wherein the filter circuit includes a nineteenth resistor, a fifth capacitor, a sixth capacitor, a twentieth resistor, a twenty-first resistor, a fifth operational amplifier, a twenty-second resistor, and a twenty-third resistor, a first end of the nineteenth resistor is connected to an output end of the fourth operational amplifier, a second end of the nineteenth resistor is grounded through the fifth capacitor, a second end of the nineteenth resistor is connected to a non-inverting input end of the fifth operational amplifier through the sixth capacitor, a non-inverting input end of the fifth operational amplifier is grounded through the twentieth resistor, an inverting input end of the fifth operational amplifier is grounded through the twenty-second resistor, an output end of the fifth operational amplifier is connected to an inverting input end of the fifth operational amplifier through the twenty-third resistor, and an output end of the fifth operational amplifier is connected to a second end of the nineteenth resistor through the twenty-first resistor.
7. The distance detection circuit according to claim 6, wherein the shaping circuit comprises a fourth capacitor, a sixth not gate, a seventh not gate and an eighteenth resistor, wherein a first end of the fourth capacitor is connected to the output end of the fifth operational amplifier, a second end of the fourth capacitor is connected to the input end of the sixth not gate, the output end of the sixth not gate is connected to the input end of the seventh not gate, the output end of the seventh not gate is connected to the master control unit, and the input end of the sixth not gate is connected to the output end of the seventh not gate through the eighteenth resistor.
8. A distance detecting device, characterized in that it comprises a distance detecting circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320987694.7U CN220019875U (en) | 2023-04-26 | 2023-04-26 | Distance detection circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320987694.7U CN220019875U (en) | 2023-04-26 | 2023-04-26 | Distance detection circuit and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220019875U true CN220019875U (en) | 2023-11-14 |
Family
ID=88685565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320987694.7U Active CN220019875U (en) | 2023-04-26 | 2023-04-26 | Distance detection circuit and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220019875U (en) |
-
2023
- 2023-04-26 CN CN202320987694.7U patent/CN220019875U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103175587B (en) | Guided wave radar liquid indicator | |
| CN101561244B (en) | Magnetostrictive displacement sensor with high precision and large measuring range | |
| CN102590805B (en) | Ultrasonic circuit system for improving range-measuring accuracy | |
| CN206177890U (en) | Combustible gas concentration detection device with remote alarm function | |
| CN113030248B (en) | Hydrogen measurement system and method based on ultrasonic double-frequency phase difference | |
| CN201535664U (en) | High-precision wide-range magnetostriction displacement sensor | |
| CN101038151A (en) | Magnetostrictive displacement sensor | |
| CN220019875U (en) | Distance detection circuit and device | |
| CN207336748U (en) | A kind of ultrasonic ranging system | |
| CN219829137U (en) | Uninterrupted air energy heating system | |
| CN202453327U (en) | Ultrasonic wall detector | |
| CN103163526B (en) | Ultrasonic Doppler velocimeter | |
| CN103256964B (en) | A kind of capacitance liquid level measurement mechanism | |
| CN214173390U (en) | Optical fiber sensing high-speed data acquisition system | |
| CN210990370U (en) | Ultrasonic drive circuit and ultrasonic lung function instrument | |
| CN203705400U (en) | Grounding grid corrosion detection system | |
| CN220794361U (en) | Blast furnace burden level detecting system | |
| CN220625582U (en) | Steel construction welding residual stress detector | |
| CN219532969U (en) | Portable reflection type microwave moisture content measuring device based on frequency mixing technology | |
| CN218727729U (en) | Ultrasonic transducer performance testing device | |
| CN219831341U (en) | AC/DC leakage detection device with high-frequency AC measurement | |
| CN112033485B (en) | Ultrasonic sensor high-voltage pulse receiving and transmitting multiplexing system | |
| CN218973492U (en) | Motion state detection device | |
| CN220040486U (en) | Ultrasonic wind measuring device used in extremely low temperature environment | |
| Cui et al. | High precision liquid level measuring device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |