CN201654232U - Intelligent ultrasonic distance measuring sensor - Google Patents
Intelligent ultrasonic distance measuring sensor Download PDFInfo
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- CN201654232U CN201654232U CN2010201791271U CN201020179127U CN201654232U CN 201654232 U CN201654232 U CN 201654232U CN 2010201791271 U CN2010201791271 U CN 2010201791271U CN 201020179127 U CN201020179127 U CN 201020179127U CN 201654232 U CN201654232 U CN 201654232U
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Abstract
The utility model relates to an intelligent ultrasonic distance measuring sensor, which comprises a transmission module and a receive module which are independent to each other, wherein the transmission module comprises a light wave transmitter, an ultrasonic transmitter, a light wave transmission circuit, an ultrasonic transmission circuit and a signal generator, and the signal input ends of the light wave transmission circuit and the ultrasonic transmission circuit are connected to the output end of the signal generator in parallel; the receive module comprises a light wave receiver, an ultrasonic receiver, a light wave receiving circuit, an ultrasonic receiving circuit, a signal processor and a temperature-compensation circuit with a temperature sensor, wherein the output end of the light wave receiving circuit is connected with the output end of the temperature-compensation circuit in parallel and is then connected with the control terminal of the signal processor, and the output end of the ultrasonic transmitter is connected with the control terminal of the signal processor to form a circuit. The utility model can eliminate the measuring dead zone without depending on ultrasonic transmission, adopts large distance measurement rang, has small environment influences when the measurement is carried out, and has high measuring accuracy.
Description
Technical field
The utility model relates to a kind of supersonic range finder, specifically, relates to a kind of intelligent ultrasonic distance measuring module.
Background technology
The ultrasonic distance measuring module that provides in the market, great majority all are the modes that adopts echo-bearing, the device of this class is integrated with ultrasonic transmitter and receiver, during work, ultrasonic transmitter emission ultrasound wave, ultrasound wave are reflected back toward the reception of cause receiver after arriving and surveying object, send and the mistiming of reception and the distance that the velocity of sound calculates measured object according to ultrasound wave, this ultrasound examination distance is limited, and measured object is had certain requirement, and the precision of detection is relatively poor to be interfered easily.Also have and adopt ultrasonic emitting and ultrasound wave to receive method for designing separately,
It is that the patent name of 2784945Y is: a kind of ultrasonic ranging sensor that Patent Office of the People's Republic of China has announced notification number on May 31st, 2006, it comprises the ultrasonic transmitter and the ultrasonic receiver composition of each self-separation, and a light velocity wave launcher has been installed on ultrasonic transmitter, the control end parallel connection of ultrasonic transmitter and light velocity wave launcher, connect and compose control loop with the output terminal of a pulse signal generator, a light velocity ripple receiver has been installed on the ultrasonic receiver, the output terminal of light velocity ripple receiver connects the control end of pulse trigger, the output terminal of ultrasonic receiver connects pulse amplified shaping circuit, the output terminal of pulse amplified shaping circuit and the control end of pulse trigger connect and compose control loop, when work, ultrasonic transmitter on the ultrasonic transmit circuit and light velocity wave launcher intermittently send pulse ultrasonic wave and light velocity ripple synchronously under the control of pulse signal generator; Ultrasonic receiver on the ultrasound wave receiving circuit and light velocity ripple receiver receive signal separately, and deliver to the control end of pulse trigger, the output terminal of pulse trigger will produce corresponding two different pulse signals, and these two different pulses are exactly signal of sensor.But, can change along with the variation of surrounding environment because hyperacoustic velocity of propagation is not a steady state value under various environment.The environmental factor that influences ultrasonic propagation velocity is temperature most importantly.This ultrasonic ranging sensor does not compensate at environmental factor, and when particularly transferring in another environment from an environment, if the characteristic of two environment (especially temperature) difference is too big, its measuring accuracy just is difficult to guarantee.Its usable range is subjected to certain restriction.
Summary of the invention
The utility model has mainly solved: supersonic range finder is subjected to the particularly restricted problem of temperature variation factor of environmental factor, and a kind of intelligent ultrasonic distance measuring module that can measure in varying environment is provided.
The technical solution adopted in the utility model is: a kind of intelligent ultrasonic ranging sensor, comprise separate transmitter module and receiver module, described transmitter module comprises light velocity wave launcher, ultrasonic transmitter, light velocity wave transmitting circuit, ultrasonic transmit circuit and signal generator, light velocity wave launcher is connected with light velocity wave transmitting circuit, ultrasonic transmitter is connected with ultrasonic transmit circuit, and the signal input part of light velocity wave transmitting circuit and ultrasonic transmit circuit also is connected to the output terminal of a signal generator; Described receiver module comprises light velocity ripple receiver, ultrasonic receiver, light velocity ripple receiving circuit, ultrasound wave receiving circuit, signal processor and has the temperature-compensation circuit of temperature sensor, light velocity ripple receiver is connected with light velocity ripple receiving circuit, ultrasonic receiver is connected with the ultrasound wave receiving circuit, the output terminal of light velocity ripple receiving circuit and the output terminal of temperature-compensation circuit are connected in parallel and are connected with the control end of signal processor, and the output terminal of ultrasonic transmitter and the control end of signal processor connect and compose the loop.
Light velocity ripple and ultrasound wave be emission simultaneously under the control of signal generator, receive by receiver module again, because range finding is generally carried out in air, this moment, light velocity ripple was subjected to the influence of environment very little than ultrasound wave, and the aerial speed of light velocity ripple is about 300,000 thousand meter per seconds, the relative light velocity closely in the light velocity wave propagation time can ignore, so the opening time of seeing ultrasonic ranging as that the time of reception of light velocity ripple can be similar to.Transmitter module is launched light velocity wave pulse signal earlier to receiver module during measurement, launch ultrasonic pulse signal simultaneously, when receiver module receives light velocity wave pulse signal, pick up counting, timing stops when receiving ultrasonic signal, and both time differences are the aerial travel-time t of ultrasound wave
12, simultaneously infer the ultrasonic velocity v that under this temperature by the temperature compensation compensating circuit.According to formula s=v * t
12, just can calculate the distance between transmitter module and the receiver module.
As preferably, also be provided with a battery booster circuit in the described transmitter module, the output terminal of battery booster circuit is connected with the power end of light velocity wave transmitting circuit, ultrasonic transmit circuit and signal generator, and described battery booster circuit is made up of a single-chip microcomputer (IC3), crystal oscillator (E1), crystal oscillator (E2), inductance (L1), electric capacity (C5) and four resistance (R15, R16, R17, R18).After mainly boosting cell voltage, the battery booster circuit provides a stable 5V power supply that is independent of receiver module to transmitter module.
As preferably, described signal generator is the emission single-chip microcomputer, the emission single-chip microcomputer is connected with the emission single chip circuit, the emission single chip circuit is by a crystal oscillator (XT1), a resistance (R20) and three electric capacity (C1, C2, C3) form, one termination ground wire of resistance (R5), the other end is connected with an end of one of them electric capacity (C1), another termination high potential of electric capacity (C1) (+5V), electric capacity (C2) terminated wires, the input end of single-chip microcomputer and an end of crystal oscillator (XT1) are penetrated in other end sending and receiving, electric capacity (C3) termination ground wire, another input end of single-chip microcomputer and the other end of crystal oscillator (XT1) are penetrated in other end sending and receiving, the emission single-chip microcomputer (IC1) earth terminal and voltage input end respectively with ground wire, (+5V) corresponding connection, the signal output part of emission single-chip microcomputer (IC1) is connected with the signal input part of light velocity wave transmitting circuit and the signal input part of ultrasonic transmit circuit respectively high potential.
As preferably, described light velocity wave launcher is an infrared transmitter, described light velocity ripple receiver is the infrared light receiver, described light beam wave transmitting circuit is the infrared light radiating circuit, described light beam ripple receiving circuit is the infrared light receiving circuit, described infrared transmitter is infrared light diode (D1), the infrared light radiating circuit comprises a transistor (Q2) and two resistance (R5, R10), one end of one of them resistance R 5 is connected with the output terminal of emission single-chip microcomputer (IC1), the other end is connected the collector of transistor (Q2) with base stage with transistor Q2, infrared light diode (D1), another resistance (R10), ground wire is connected in series successively.
As preferably, described ultrasonic transmit circuit is made up of a transistor (Q1), a resistance (R19) and six not gates (IC2A, IC2B, IC2C, IC2D, IC2E, IC2F) circuit, after not gate (IC2C) Sheffer stroke gate (IC2D) parallel connection, connect as the just driving of ultrasonic emitting head with a not gate (IC2B) again; Not gate (IC2E) Sheffer stroke gate (IC2F) parallel connection, connect as the negative driving of ultrasonic emitting head with electric capacity (C4) again, just driving and bearing the collector that driving back in parallel Sheffer stroke gate (IC2A) is connected in series in transistor (Q1), and the collector of transistor (Q1), resistance (R19), high potential (+5V) being connected in series successively, the base stage of transistor (Q1) is connected with a signal output part of emission single-chip microcomputer (IC1).
As preferably, signal processor is for receiving single-chip microcomputer (IC2), the infrared light receiver is connected with the infrared light receiving circuit, the output signal end of infrared light receiving circuit and temperature-compensation circuit is connected with reception single-chip microcomputer IC2 respectively, ultrasonic receiver is connected with the ultrasound wave receiving circuit, and the ultrasound wave receiving circuit connects and composes the loop with reception single-chip microcomputer IC2.
As preferably, described ultrasound wave receiving circuit comprises pre-amplification circuit, sample circuit, single tube single tuning amplifying circuit, detecting circuit, the comparator circuit that links to each other with the ultrasonic receiver order;
Described pre-amplification circuit is by a transistor (Q1), two electric capacity (C8, C9) and three resistance (R1, R4, R5) negative feedback amplifier circuit of a degree of depth of Zu Chenging, one of them resistance (R1) terminated wires, the other end is connected with an end of ultrasonic receiver and an end of one of them electric capacity (C8) respectively, the base stage of another termination transistor (Q1) of electric capacity (C8), the two ends of resistance (R4) are connected with collector with the base stage of transistor (Q1) respectively, played the degenerative effect of a degree of depth, the collector of transistor (Q1) also with electric capacity (C9), one end of resistance (R5) connects, another termination high potential of resistance (R5) (+5V), the other end of electric capacity (C9) is connected with sample circuit as output terminal, and signal is passed to sample circuit.
Described sample circuit comprises two resistance (R2, R6) and two diodes (D1, D2), resistance (R2) is connected with a parallel circuit that is made of resistance (R6) and two diodes (D1, D2), wherein two diode reverse are connected in parallel in the circuit, resistance (R2) is connected with the output terminal of pre-amplification circuit, import sampled signal, the output terminal of parallel circuit is connected with single tube single tuning amplifying circuit, with the signal transmission.
Described single tube single tuning amplifying circuit is by a transistor (Q2), four electric capacity (C7, C10, C11, C12), three resistance (R8, R9, R10), an inductance (L1) is formed, the circuit that electric capacity (C11) and resistance (R10) are connected in parallel and constitute, connect and compose bypass with the emitter and the ground wire of transistor (Q2) respectively again, electric capacity (C7) and inductance (L1) formation in parallel resonant tank, again respectively with high potential (+5V) collector with transistor (Q2) is connected, resonant tank is as transistorized collector load, its resonance frequency is tuned on the centre frequency of ultrasonic signal, resistance (R8) and resistance (R9) are connected between ground wire and the high potential, the link of resistance (R8) and resistance (R9) is connected with the base stage of transistor (Q2), two resistance mainly provide dc offset voltage to transistor, electric capacity (C10) and electric capacity (C11) are respectively sample circuits, the coupling capacitance of detecting circuit, electric capacity (C10) end is connected with the output terminal of sample circuit, the other end is connected with the base stage of transistor (Q2), and electric capacity (C12) end is connected with the collector of transistor (Q2), the other end is connected with the input end of detecting circuit as output terminal.
Described detecting circuit is made up of a transistor of a diode (D3) (Q3), a resistance (R3) and an electric capacity (C13); Resistance (R3) and electric capacity (C13) parallel connection, the emitter other end ground wire of the circuit one termination transistor (Q3) after the parallel connection, the negative pole of diode (D3) connects base stage, the plus earth line of transistor (Q3), diode D3 has played the effect that will bear the filtering of semiaxis waveform, the base stage of transistor (Q3) is connected with the output terminal of single tube single tuning amplifying circuit, collector and high potential (+5V) be connected, emitter is connected with comparator circuit as output terminal.
Described comparator circuit is mainly by three resistance (R7, R12, R13), an electric capacity (C14) and an amplifier (IC2) are formed, electric capacity (C14) end is connected with detecting circuit as input end, the other end connects an end of resistance (R7) and resistance (R13), resistance (R7) other end ground wire, the negative pole of another termination amplifier (IC2) of resistance (R13), series resistance between the negative pole of amplifier and the output terminal (R12), the positive pole of amplifier connects the output terminal of a variable resistor (RW1), variable-resistance two input ends difference ground wire and high potential (+5V), the output terminal of amplifier is connected with an input end that receives single-chip microcomputer (IC4).
The beneficial effect that the utility model is obtained: 1 adopts ultrasonic emitting end and receiving end separate modules, does not rely on hyperacoustic emission, can eliminate the blind area of measurement.2 adopt finding range big, owing in the receiver module temperature-compensation circuit is arranged, environmental impact is little during measurement, the measuring accuracy height.
Description of drawings
Fig. 1 is battery booster circuit figure of the present utility model;
Fig. 2 is the circuit theory diagrams of transmitter module work of the present utility model;
Fig. 3 is the circuit theory diagrams of receiver module work of the present utility model;
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Embodiment: a kind of intelligent ultrasonic ranging sensor, comprise separate transmitter module and receiver module, transmitter module comprises infrared transmitter D1, ultrasonic transmitter JP1, infrared light radiating circuit, ultrasonic transmit circuit, the emission single chip circuit, the battery booster circuit (referring to accompanying drawing 1,2,3) that are connected with emission single-chip microcomputer IC1, the signal input part of infrared light radiating circuit and ultrasonic transmit circuit also is connected to the output terminal of launching single-chip microcomputer, and wherein infrared transmitter is infrared light diode D1; Receiver module comprise infrared light receiver AS1, ultrasonic receiver J1, infrared light receiving circuit, ultrasound wave receiving circuit, with receive single-chip microcomputer IC4 reception single chip circuit that is connected and the temperature-compensation circuit that is connected with temperature sensor J2, wherein temperature sensor J2 model is DS18B20, the output terminal of infrared light receiving circuit and the output terminal of temperature-compensation circuit are parallel-connected to the control end that receives single-chip microcomputer, and the output terminal of ultrasonic transmitter JP1 connects and composes the loop with the control end that receives single-chip microcomputer IC4.
Battery booster circuit (referring to accompanying drawing 1) is made up of the chip IC 3 of boosting, crystal oscillator E1, crystal oscillator E2, inductance L 1, capacitor C 5, resistance R 2, resistance R 6, resistance R 7 and a resistance R 8, provides a stable 5V power supply that is independent of receiver module to transmitter module after the battery booster circuit mainly boosts cell voltage.
Emission single chip circuit (referring to accompanying drawing 2) is by emission single-chip microcomputer IC1, capacitor C 1, capacitor C 2, capacitor C 3, resistance R 3 and crystal oscillator XT1 form, and the signal output part of emission single-chip microcomputer IC1 is connected with the signal input part of infrared light radiating circuit and the signal input part of ultrasonic transmit circuit respectively.
Infrared light radiating circuit (referring to accompanying drawing 3) comprises a transistor Q2 and two resistance R 5, R6, wherein an end of resistance R 5 is connected as the signal output part of input end with emission single-chip microcomputer IC1, the other end is connected with base stage with transistor Q2, and the collector of transistor Q2 is connected with infrared light diode D1, ground wire successively.
Ultrasonic transmit circuit is made up of a transistor Q1, resistance R 1, six not circuits, and two not gate IC2C connect as the just driving of ultrasonic emitting head with a not gate IC2B with after IC2D is in parallel again; Two not gate IC2E are in parallel with IC2F, connect with capacitor C 4 again as the negative driving of ultrasonic emitting head, just driving and bearing the collector of driving back in parallel Sheffer stroke gate IC2A series connection at transistor Q1, and collector is connected with resistance R 1, power supply high potential end successively, and the base stage of transistor Q1 is connected with the signal output part of emission single-chip microcomputer IC1.
The ultrasound wave receiving circuit comprises pre-amplification circuit, sample circuit, single tube single tuning amplifying circuit, detecting circuit, the comparator circuit that links to each other with the ultrasonic receiver order:
Pre-amplification circuit is the negative feedback amplifier circuit of the degree of depth being made up of a transistor Q1, two capacitor C 8, C9 and three resistance R 1, R4, R5, the two ends of one of them resistance R 4 are connected to base stage and the collector of transistor Q1, have played the degenerative effect of a degree of depth;
Sample circuit is composed in series by the parallel circuit that a resistance and two diode D1, D2 form by a resistance R 6 and one, wherein two diode D1, D2 reverse parallel connection;
Single tube single tuning amplifying circuit is by a transistor Q2, capacitor C 7, capacitor C 10, capacitor C 11, capacitor C 12, resistance R 8, resistance R 9, resistance R 10 and an inductance L 1 are formed, two capacitor C 10 are wherein arranged, C12 is respectively a front stage circuits, the coupling capacitance of late-class circuit, the be connected in parallel circuit that constitutes of capacitor C 11 and resistance R 10 connects and composes bypass with emitter and the ground wire of transistor Q2 respectively, capacitor C 7 is with inductance L 1 composition shunt-resonant circuit and as transistorized collector load, its resonance frequency is tuned on the centre frequency of ultrasonic signal, resistance R 8, the end of R9 is connected with the base stage of transistor Q2 respectively, an other end is connected with power supply high potential end with ground wire respectively, two resistance R 8, R9 mainly provides dc offset voltage to transistor;
Detecting circuit comprises by a diode D3, a triode Q3, a resistance R 3 and a capacitor C 13 and forming that wherein D3 has played the effect that will bear the filtering of semiaxis waveform;
Comparator circuit is by resistance R 7, resistance R 12, resistance R 13, a capacitor C 14 and an amplifier IC2 form, capacitor C 14 1 ends are connected with detecting circuit as input end, the other end connects an end of resistance R 7 and resistance R 13, resistance R 7 other end ground wires, the negative pole of resistance R 13 another termination amplifier IC2, series resistance R12 between the negative pole of amplifier and the output terminal, the positive pole of amplifier connects the output terminal of a variable resistor RW1, variable-resistance two input ends are ground wire and high potential+5V respectively, and the output terminal of amplifier is connected with an input end that receives single-chip microcomputer IC4.
Infrared transmitter D1 and ultrasonic transmitter JP1 be emission simultaneously under the control of emission single-chip microcomputer, receive by receiver module again, because range finding is generally carried out in air, this moment, infrared light was subjected to the influence of environment very little than ultrasound wave, and the aerial speed of infrared light is about 300,000 thousand meter per seconds, the relative light velocity closely in travel-time of infrared light can ignore, so the opening time of seeing ultrasonic ranging as that the time of reception of infrared light can be similar to.Transmitter module is launched the infrared light pulse signal earlier to receiver module during measurement, launches ultrasonic pulse signal simultaneously.When receiver module receives the infrared light pulse signal, pick up counting, timing stops when receiving ultrasonic signal, and both time differences are the aerial travel-time t of ultrasound wave
12, simultaneously infer the ultrasonic velocity v that under this temperature by temperature-compensation circuit.According to formula s=v * t
12, just can calculate the distance between transmitter module and the receiver module.
Claims (8)
1. intelligent ultrasonic ranging sensor, comprise separate transmitter module and receiver module, it is characterized in that: described transmitter module comprises light velocity wave launcher, ultrasonic transmitter, light velocity wave transmitting circuit, ultrasonic transmit circuit and signal generator, light velocity wave launcher is connected with light velocity wave transmitting circuit, ultrasonic transmitter is connected with ultrasonic transmit circuit, and the signal input part of light velocity wave transmitting circuit and ultrasonic transmit circuit also is connected to the output terminal of a signal generator; Described receiver module comprises light velocity ripple receiver, ultrasonic receiver, light velocity ripple receiving circuit, ultrasound wave receiving circuit, signal processor and has the temperature-compensation circuit of temperature sensor, light velocity ripple receiver is connected with light velocity ripple receiving circuit, ultrasonic receiver is connected with the ultrasound wave receiving circuit, the output terminal of light velocity ripple receiving circuit and the output terminal of temperature-compensation circuit are connected in parallel and are connected with the control end of signal processor, and the output terminal of ultrasonic transmitter and the control end of signal processor connect and compose the loop.
2. a kind of intelligent ultrasonic ranging sensor according to claim 1, it is characterized in that: also be provided with a battery booster circuit in the described transmitter module, the output terminal of battery booster circuit is connected with the power end of light velocity wave transmitting circuit, ultrasonic transmit circuit and signal generator, and described battery booster circuit mainly is made up of the chip that boosts (IC3), two crystal oscillators (E1, E2), inductance (L1), electric capacity (C5), four resistance (R15, R16, R17, R18).
3. a kind of intelligent ultrasonic ranging sensor according to claim 1 and 2, it is characterized in that: described signal generator is the emission single-chip microcomputer, the emission single-chip microcomputer is connected with the emission single chip circuit, the emission single chip circuit is by three electric capacity (C1, C2, C3), a resistance (R20) and a crystal oscillator (XT1) are formed, one termination ground wire of resistance (R20), the other end is connected with an end of one of them electric capacity (C1), another termination high potential of electric capacity (C1) (+5V), electric capacity (C2) terminated wires, the input end of single-chip microcomputer and an end of crystal oscillator (XT1) are penetrated in other end sending and receiving, electric capacity (C3) termination ground wire, another input end of single-chip microcomputer and the other end of crystal oscillator (XT1) are penetrated in other end sending and receiving, the emission single-chip microcomputer (IC1) earth terminal and voltage input end respectively with ground wire, (+5V) corresponding connection, the signal output part of emission single-chip microcomputer (IC1) is connected with the signal input part of light velocity wave transmitting circuit and the signal input part of ultrasonic transmit circuit respectively high potential.
4. a kind of intelligent ultrasonic ranging sensor according to claim 1, it is characterized in that: described light velocity wave launcher is an infrared transmitter, described light velocity ripple receiver is the infrared light receiver, described light beam wave transmitting circuit is the infrared light radiating circuit, and described light beam ripple receiving circuit is the infrared light receiving circuit.
5. a kind of intelligent ultrasonic ranging sensor according to claim 4, it is characterized in that: described infrared transmitter is infrared light diode (D1), the infrared light radiating circuit comprises a transistor (Q2) and two resistance (R5, R10), one end of one of them resistance (R5) is connected with the output terminal of emission single-chip microcomputer (IC1), the other end is connected with base stage with transistor (Q2), and the collector of transistor (Q2), infrared light diode (D1), another resistance (R10), ground wire are connected successively.
6. a kind of intelligent ultrasonic ranging sensor according to claim 1 and 2, it is characterized in that: described ultrasonic transmit circuit is made up of a transistor (Q1), a resistance (R19), six not gates (IC2A, IC2B, IC2C, IC2D, IC2E, IC2F) circuit, after not gate (IC2C) Sheffer stroke gate (IC2D) parallel connection, connect as the just driving of ultrasonic emitting head with a not gate (IC2B) again; Not gate (IC2E) Sheffer stroke gate (IC2F) parallel connection, connect with capacitor C 4 again as the negative driving of ultrasonic emitting head, just driving and bearing the collector that driving back in parallel Sheffer stroke gate (IC2A) is connected in series in transistor (Q1), and the collector of transistor (Q1), resistance (R19), high potential (+5V) being connected in series successively, the base stage of transistor (Q1) is connected with a signal output part of emission single-chip microcomputer (IC1).
7. according to claim 1 or 4 described a kind of intelligent ultrasonic ranging sensors, it is characterized in that: signal processor is for receiving single-chip microcomputer (IC2), the infrared light receiver is connected with the infrared light receiving circuit, the output signal end of infrared light receiving circuit and temperature-compensation circuit is connected with reception single-chip microcomputer (IC2) respectively, ultrasonic receiver is connected with the ultrasound wave receiving circuit, and the ultrasound wave receiving circuit connects and composes the loop with reception single-chip microcomputer (IC2).
8. a kind of intelligent ultrasonic ranging sensor according to claim 1 is characterized in that: described ultrasound wave receiving circuit comprises pre-amplification circuit, sample circuit, single tube single tuning amplifying circuit, detecting circuit, the comparator circuit that links to each other with the ultrasonic receiver order:
Described pre-amplification circuit is by a transistor (Q1), two electric capacity (C8, C9), three resistance (R1, R4, R5) negative feedback amplifier circuit of a degree of depth of Zu Chenging, one of them resistance (R1) terminated wires, the other end is connected with an end of ultrasonic receiver and an end of one of them electric capacity (C8) respectively, the base stage of another termination transistor (Q1) of electric capacity (C8), the two ends of resistance (R4) are connected with collector with the base stage of transistor (Q1) respectively, played the degenerative effect of a degree of depth, the collector of transistor (Q1) also with electric capacity (C9), one end of resistance (R5) connects, another termination high potential of resistance (R5) (+5V), the other end of electric capacity (C9) is connected with sample circuit as output terminal, and signal is passed to sample circuit;
Described sample circuit comprises two resistance (R2, R6) and two diodes (D1, D2), resistance (R2) is connected with a parallel circuit that is made of resistance (R6) and two diodes (D1, D2), wherein two diode reverse are connected in parallel in the circuit, resistance (R2) is connected with the output terminal of pre-amplification circuit, import sampled signal, the output terminal of parallel circuit is connected with single tube single tuning amplifying circuit, with the signal transmission;
Described single tube single tuning amplifying circuit is by a transistor (Q2), four electric capacity (C7, C10, C11, C12), three resistance (R8, R9, R10), an inductance (L1) is formed, the circuit that electric capacity (C11) and resistance (R10) are connected in parallel and constitute, connect and compose bypass with the emitter and the ground wire of transistor (Q2) respectively again, electric capacity (C7) and inductance (L1) formation in parallel resonant tank, again respectively with high potential (+5V) collector with transistor (Q2) is connected, resonant tank is as transistorized collector load, its resonance frequency is tuned on the centre frequency of ultrasonic signal, resistance (R8) and resistance (R9) are connected between ground wire and the high potential, the link of resistance (R8) and resistance (R9) is connected with the base stage of transistor (Q2), two resistance mainly provide dc offset voltage to transistor, electric capacity (C10) and electric capacity (C11) are respectively sample circuits, the coupling capacitance of detecting circuit, electric capacity (C10) end is connected with the output terminal of sample circuit, the other end is connected with the base stage of transistor (Q2), and electric capacity (C12) end is connected with the collector of transistor (Q2), the other end is connected with the input end of detecting circuit as output terminal;
Described detecting circuit is made up of a transistor of a diode (D3) (Q3), a resistance (R3) and an electric capacity (C13); Resistance (R3) and electric capacity (C13) parallel connection, the emitter other end ground wire of the circuit one termination transistor (Q3) after the parallel connection, the negative pole of diode (D3) connects base stage, the plus earth line of transistor (Q3), diode D3 has played the effect that will bear the filtering of semiaxis waveform, the base stage of transistor (Q3) is connected with the output terminal of single tube single tuning amplifying circuit, collector and high potential (+5V) be connected, emitter is connected with comparator circuit as output terminal;
Described comparator circuit is mainly by three resistance (R7, R12, R13), an electric capacity (C14) and an amplifier (IC2) are formed, electric capacity (C14) end is connected with detecting circuit as input end, the other end connects an end of resistance (R7) and resistance (R13), resistance (R7) other end ground wire, the negative pole of another termination amplifier (IC2) of resistance (R13), series resistance between the negative pole of amplifier and the output terminal (R12), the positive pole of amplifier connects the output terminal of a variable resistor (RW1), variable-resistance two input ends difference ground wire and high potential (+5V), the output terminal of amplifier is connected with an input end that receives single-chip microcomputer (IC4).
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| CN2010201791271U CN201654232U (en) | 2010-04-30 | 2010-04-30 | Intelligent ultrasonic distance measuring sensor |
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| CN103645478A (en) * | 2013-12-20 | 2014-03-19 | 奇瑞汽车股份有限公司 | Ultrasonic distance measuring device |
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- 2010-04-30 CN CN2010201791271U patent/CN201654232U/en not_active Expired - Lifetime
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| CN103645478A (en) * | 2013-12-20 | 2014-03-19 | 奇瑞汽车股份有限公司 | Ultrasonic distance measuring device |
| CN105911549A (en) * | 2016-05-18 | 2016-08-31 | 青岛大学 | Ultrasonic handheld type obstacle-encountering warning mobile phone holder |
| CN113315534A (en) * | 2020-02-11 | 2021-08-27 | 创意电子股份有限公司 | Voltage mode signal transceiver and voltage mode signal transmitter thereof |
| CN113315534B (en) * | 2020-02-11 | 2022-12-16 | 创意电子股份有限公司 | Voltage mode signal transceiver and voltage mode signal transmitter thereof |
| CN113303733A (en) * | 2020-02-27 | 2021-08-27 | 北京石头世纪科技股份有限公司 | Cleaning robot |
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