CN112285209A - Pavement material detection device based on ultrasonic waves and manufacturing method - Google Patents
Pavement material detection device based on ultrasonic waves and manufacturing method Download PDFInfo
- Publication number
- CN112285209A CN112285209A CN202011305119.1A CN202011305119A CN112285209A CN 112285209 A CN112285209 A CN 112285209A CN 202011305119 A CN202011305119 A CN 202011305119A CN 112285209 A CN112285209 A CN 112285209A
- Authority
- CN
- China
- Prior art keywords
- piezoelectric ceramic
- circuit board
- control circuit
- main control
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 37
- 238000001514 detection method Methods 0.000 title claims abstract description 29
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 239000000919 ceramic Substances 0.000 claims description 46
- 230000001681 protective effect Effects 0.000 claims description 28
- 239000003990 capacitor Substances 0.000 claims description 19
- 239000003292 glue Substances 0.000 claims description 17
- 238000005259 measurement Methods 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 9
- 230000008054 signal transmission Effects 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000002592 echocardiography Methods 0.000 description 2
- 101100458289 Drosophila melanogaster msps gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/24—Probes
- G01N29/2437—Piezoelectric probes
- G01N29/245—Ceramic probes, e.g. lead zirconate titanate [PZT] probes
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Ceramic Engineering (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention discloses a pavement material detection device based on ultrasonic waves and a manufacturing method thereof, wherein the device comprises: the main control circuit board is positioned in the shell and comprises a main controller MCU, a transceiving converter, a signal amplifier and an ultrasonic transducer, and the main control circuit board is connected with a power supply module which supplies power to the main control circuit board; the main controller MCU switches a transmitting state and a receiving state through the transceiving converter at regular time; the main controller MCU is used for sending square wave electric signals to the ultrasonic transducer through the transceiving converter and receiving feedback electric signals of the transceiving converter through the signal amplifier, and the main controller MCU outputs high and low levels according to the feedback electric signals. The invention can realize the detection of the road surface material with the frequency of millisecond grade, and can quickly, efficiently and stably identify the road surface material.
Description
Technical Field
The invention belongs to the field of pavement material detection, and particularly relates to a pavement material detection device based on ultrasonic waves and a manufacturing method thereof.
Background
The vehicle can pass through road conditions of various materials in the driving process, and different measures are often required to be taken according to the road conditions. For example, when passing over paved and muddy roads, the driver is required to control the power output of the vehicle by human judgment and operation to achieve optimum efficiency while preventing the vehicle from slipping. In the current automobile scheme, emergency treatment is performed after a vehicle detects that a tire skids, for example, electronic skid limitation and mechanical skid limitation are performed, and a driver manually switches a driving mode. However, the material of the road surface is still artificially judged, the material of the road surface cannot be accurately and quickly confirmed, and the power output of the vehicle cannot be accurately controlled according to the material of the road surface.
Disclosure of Invention
In order to solve the problems, the invention provides a road surface material detection device based on ultrasonic waves and a manufacturing method thereof, which can realize the detection of the road surface material at the millisecond-level frequency and can quickly, efficiently and stably identify the road surface material, so that a vehicle can automatically identify the road surface material condition, the probability of skidding and vehicle trapping caused by the error of artificial identification is reduced, and the safety of the vehicle and passengers is ensured.
In order to achieve the purpose, the invention adopts the technical scheme that:
an ultrasonic-based road surface material detection device, comprising: the main control circuit board is positioned in the shell and comprises a main controller MCU, a transceiving converter, a signal amplifier and an ultrasonic transducer, and the main control circuit board is connected with a power supply module which supplies power to the main control circuit board; the main controller MCU switches a transmitting state and a receiving state through the transceiving converter at regular time; the main controller MCU is used for sending square wave electric signals to the ultrasonic transducer through the transceiving converter and receiving feedback electric signals of the transceiving converter through the signal amplifier, and the main controller MCU outputs high and low levels according to the feedback electric signals.
Preferably, the ultrasonic transducer comprises a harmonic oscillator and a piezoelectric ceramic piece, the piezoelectric ceramic piece comprises an anode and a cathode, the piezoelectric ceramic piece is connected with an electrode plate through the anode and the cathode, the harmonic oscillator is bonded on the other side of the piezoelectric ceramic piece, the electrode plate is connected with the main control circuit board, and the main control circuit board is externally connected with a signal transmission line.
More preferably, protective cases are arranged outside the harmonic oscillator and the piezoelectric ceramic piece, hard protective glue is filled among the electrode plate, the main control circuit board and the shell, and soft buffer glue is filled among the electrode plate and the piezoelectric ceramic piece and among the shell and the protective cases.
More preferably, the piezoceramic wafer has a frequency range of 200 kHz-500 kHz.
Preferably, the main control circuit board provides a signal output enable pin.
Preferably, the master controller MCU is connected to the transceiver converter through two pins, the transceiver converter includes two nand gate chips and two electronic switches, the master controller MCU outputs waveforms with opposite phases and same frequency to the nand gate chips through the two pins, the nand gate chips output driving pulse waveforms to the electronic switches, and the electronic switches correspond to the transmitting state and the receiving state of the transceiver converter, respectively.
More preferably, the signal amplifier comprises a low noise operational amplifier, a secondary operational amplifier, a schottky diode and a measuring capacitor, the ultrasonic wave emitted by the ultrasonic transducer generates an echo when meeting a road surface, the echo passes through the ultrasonic transducer to generate a feedback electric signal, the feedback electric signal sequentially passes through the low noise operational amplifier, the secondary operational amplifier and the schottky diode to charge the measuring capacitor, and the main controller MCU is configured to collect voltages at two ends of the measuring capacitor and output high and low levels according to the voltages at the two ends of the measuring capacitor.
More preferably, the main controller MCU is further connected to a switching circuit, and the switching circuit is used for discharging the measurement capacitor; and the main controller MCU is used for outputting a high level to control the switch circuit to be switched on after the voltage at the two ends of the measuring capacitor is collected to the state.
The manufacturing method of the road surface material detection device based on the ultrasonic waves comprises the following steps:
s1: welding the positive electrode and the negative electrode of the piezoelectric ceramic piece to the piezoelectric ceramic piece;
s2: adhering the piezoelectric ceramic plate to the harmonic oscillator;
s3: the piezoelectric ceramic piece and the positive electrode, the negative electrode and the harmonic oscillator thereof are arranged in the protective shell;
s4: filling the soft buffer glue into the protective shell in the previous step;
s5: welding the positive electrode and the negative electrode of the piezoelectric ceramic piece on the electrode piece;
s6: pouring the hard protective adhesive between the electrode plate and the piezoelectric ceramic plate in the previous step;
s7: welding the signal transmission line to the main control circuit board;
s8: connecting the positive electrode and the negative electrode of the electrode plate with the main control circuit board;
s9: sleeving a shell on the main control circuit board, the harmonic oscillator, the piezoelectric ceramic piece, the protective shell and the electrode piece;
s10: and injecting the soft buffer glue between the shell and the protective shell, and injecting the hard protective glue between the master control circuit board and the shell.
Compared with the prior art, the invention has the beneficial effects that:
1. the ultrasonic-based pavement material detection device and the manufacturing method can realize the detection of the pavement material at millisecond-level frequency and can quickly, efficiently and stably identify the pavement material, so that the vehicle can automatically identify the pavement material condition, the probability of skidding and sinking caused by the error of artificial identification is reduced, and the safety of the vehicle and passengers is ensured.
2. The pavement material detection device based on ultrasonic waves and the manufacturing method thereof have the advantages of simple structure, safety, stability, low cost and easiness in popularization.
Drawings
Fig. 1 is a schematic structural diagram of a road surface material detection device based on ultrasonic waves according to the present invention.
Fig. 2 is a schematic diagram illustrating the principle of the road surface material detection device based on ultrasonic waves according to the present invention.
Fig. 3 is a schematic circuit diagram of a road surface material detection device based on ultrasonic waves according to an embodiment.
Fig. 4 is a partial view of fig. 3.
Fig. 5 is a partial view of fig. 3.
Fig. 6 is a partial view of fig. 3.
Fig. 7 is a partial view of fig. 3.
Fig. 8 is a partial view of fig. 3.
Wherein, 1, a shell; 2. soft buffer glue; 3. a protective shell; 4. a harmonic oscillator; 5. piezoelectric ceramic piece, 51, positive pole, 52, negative pole; 6. an electrode sheet; 7. a hard protective adhesive; 8. a main control circuit board; 9. a signal transmission line; 10. a transmit-receive converter; 11. a signal amplifier; 12. an ultrasonic transducer.
Detailed Description
For a better understanding of the present invention, the contents of the present invention will be further explained below with reference to the drawings and examples, but the present invention is not limited to the following examples.
Examples
As shown in fig. 1 and 2, an ultrasonic-based road surface material detection device includes: the main control circuit board 8 is located inside the casing 1, the main control circuit board 8 comprises a main controller MCU, a transceiver converter 10, a signal amplifier 11 and an ultrasonic transducer 12, the main control circuit board 8 is connected with a power supply module, and the power supply module supplies power to the main control circuit board 8. The main controller MCU switches the transmitting state and the receiving state through the transceiving converter 10 at regular time; the main controller MCU is configured to send a square wave electrical signal to the ultrasonic transducer 12 through the transceiver converter 10, and is further configured to receive a feedback electrical signal from the transceiver converter 10 through the signal amplifier 11, and output a high level and a low level according to the feedback electrical signal. Now, the following is described in detail:
the ultrasonic transducer 12 comprises a harmonic oscillator 4 and a piezoelectric ceramic piece 5, the piezoelectric ceramic piece 5 comprises an anode 51 and a cathode 52, the piezoelectric ceramic piece 5 is connected with an electrode plate 6 through the anode 51 and the cathode 52, the harmonic oscillator 4 is bonded on the other side of the piezoelectric ceramic piece 5, the electrode plate 6 is connected with a main control circuit board 8, the main control circuit board 8 is externally connected with a signal transmission line 9, the main control circuit board 8 carries out burning of the circuit board through the signal transmission line 9 and outputs high and low levels to other execution mechanisms, so that the main control unit MCU outputs the high and low levels according to feedback electric signals, the road hardness is obtained through analysis and calculation, and the hardness is provided for.
Wherein, the frequency range of the piezoelectric ceramic plate 5 is 200 kHz-500 kHz. The main control circuit board 8 further provides a signal output enable pin to achieve low power consumption environment use.
With reference to fig. 3 to 8, in this embodiment, the main controller MCU adopts HC32L110C6UA, 32MHz Cortex-M0+32 bit CPU platform, which is an MCU with ultra-Low power consumption, Low Pin Count and wide voltage working range and aims to prolong the battery service life of the portable measurement system. Meanwhile, 12-bit 1 Msps high-precision SARADC is integrated, and stable 4.2V ADC reference voltage is adopted.
The main controller MCU (i.e., U6) is connected to the transceiver converter 10 through two pins (i.e., P34 and P01), the transceiver converter 10 includes two nand gate chips (i.e., U2 and U3) and two electronic switches (i.e., U3 and U5), the main controller MCU outputs waveforms with opposite phases and the same frequency to the nand gate chips through the two pins, the nand gate chips output driving pulse waveforms to the electronic switches, and the electronic switches respectively correspond to the transmitting state and the receiving state of the transceiver converter 10. When the transceiver converter 10 is in a transmitting state, the electronic switch drives the ultrasonic transducer 12 (i.e. USR1), the piezoelectric ceramic plate 5 inputs a square-wave electrical signal with the same frequency to the electrode plate 6 at a predetermined frequency, the square-wave electrical signal reaches the piezoelectric ceramic plate 5 through the electrode plate 6, and the piezoelectric ceramic plate 5 converts the square-wave electrical signal and the harmonic oscillator 4 to emit high-frequency ultrasonic waves outwards. When the ultrasonic waves meet the road surface, echoes are generated, the echoes cause the vibration of the harmonic oscillator 4 and the piezoelectric ceramic piece 5, so that echo electric signals are generated, the main controller MCU controls the electronic switch to be switched to the receiving pin, namely, the transceiving converter 10 is in a receiving state, and the echo electric signals output feedback electric signals through the SI _ P and SI _ N of the electronic switch.
The signal amplifier 11 comprises a low noise operational amplifier (i.e. U7A), a secondary operational amplifier (i.e. U7B), a Schottky diode (i.e. D1) and a measuring capacitor (i.e. C13), the feedback electric signal passes through the low noise operational amplifier, negative pulses are removed according to the input SI _ P and SI _ N, positive pulses are reserved, and the signal is amplified by 33 times and loaded to 1/2VCC direct current level; and then the signal is amplified by 33 times again through a secondary operational amplifier, the direct current level is removed, the amplified signal continuously charges the measured capacitor through a reverse-string-prevention Schottky diode, the measured capacitor is charged to reach the peak voltage of the amplified signal, a main controller MCU adopts a 12-bit high-precision ADC to collect voltage values at two ends of the measured capacitor, the main controller performs operational analysis on different voltage values according to the collection to identify different pavement materials, the main controller MCU sets a judgment threshold value according to the parameter calibration value output to output high and low levels, and a back-stage circuit performs corresponding control operation according to the high and low levels.
The main controller MCU is also connected with a switch circuit (namely Q1), and the switch circuit is used for discharging the measuring capacitor; the main controller MCU is used for outputting high level control P15 to drive the switch circuit to be conducted after the voltage at the two ends of the measurement capacitor is collected to the state, the measurement capacitor discharges to the ground through R6 and Q1, the detection reference before the data detection is guaranteed to be low level, and the data accuracy is achieved.
The embodiment also provides a manufacturing method of the ultrasonic-based pavement material detection device, which comprises the following steps:
s1: welding the positive electrode 51 and the negative electrode 52 of the piezoelectric ceramic piece 5 to the piezoelectric ceramic piece 5;
s2: sticking the piezoelectric ceramic piece 5 to the harmonic oscillator 4;
s3: the piezoelectric ceramic piece 5, the anode 51 and the cathode 52 thereof and the harmonic oscillator 4 are arranged in the protective shell 3;
s4: filling soft buffer glue 2 into the protective shell 3 in the previous step;
s5: welding the positive electrode 51 and the negative electrode 52 of the piezoelectric ceramic piece 5 to the electrode plate 6;
s6: pouring hard protective glue 7 between the electrode plate 6 and the piezoelectric ceramic piece 5 in the previous step;
s7: welding the signal transmission line 9 to the main control circuit board 8;
s8: connecting the positive electrode 52 and the negative electrode 52 of the electrode plate 6 with the main control circuit board 8;
s9: the shell is sleeved on the main control circuit board 8, the harmonic oscillator 4, the piezoelectric ceramic piece 5, the protective shell 3 and the electrode plate 6;
s10: soft buffer glue 2 is injected between the shell and the protective shell 3, and hard protective glue 7 is injected between the main control circuit board 8 and the shell.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (9)
1. The utility model provides a road surface material detection device based on ultrasonic wave which characterized in that includes: the main control circuit board is positioned in the shell and comprises a main controller MCU, a transceiving converter, a signal amplifier and an ultrasonic transducer, and the main control circuit board is connected with a power supply module which supplies power to the main control circuit board; the main controller MCU switches a transmitting state and a receiving state through the transceiving converter at regular time; the main controller MCU is used for sending square wave electric signals to the ultrasonic transducer through the transceiving converter and receiving feedback electric signals of the transceiving converter through the signal amplifier, and the main controller MCU outputs high and low levels according to the feedback electric signals.
2. The ultrasonic-based pavement material detection device according to claim 1, wherein the ultrasonic transducer comprises a harmonic oscillator and a piezoelectric ceramic plate, the piezoelectric ceramic plate comprises a positive electrode and a negative electrode, the piezoelectric ceramic plate is connected with an electrode plate through the positive electrode and the negative electrode, the harmonic oscillator is bonded to the other side of the piezoelectric ceramic plate, the electrode plate is connected with the main control circuit board, and the main control circuit board is externally connected with a signal transmission line.
3. The ultrasonic-based pavement material detection device according to claim 2, wherein protective cases are arranged outside the harmonic oscillator and the piezoelectric ceramic plate, hard protective glue is filled among the electrode plate, the main control circuit board and the casing, and soft buffer glue is filled among the electrode plate, the piezoelectric ceramic plate and the casing.
4. The ultrasonic-based pavement material detection device of claim 2, wherein the frequency range of the piezoelectric ceramic plate is 200kHz to 500 kHz.
5. The ultrasonic-based pavement material detection device according to claim 1, wherein the main control circuit board provides a signal output enable pin.
6. The ultrasonic-based pavement material detection device according to claim 1, wherein the master controller MCU is connected to the transceiver converter through two pins, the transceiver converter comprises two nand gate chips and two electronic switches, the master controller MCU outputs waveforms with opposite phases and same frequency to the nand gate chips through the two pins, the nand gate chips output driving pulse waveforms to the electronic switches, and the electronic switches correspond to the transmitting state and the receiving state of the transceiver converter, respectively.
7. The ultrasonic-based pavement material detection device according to claim 6, wherein the signal amplifier comprises a low noise operational amplifier, a secondary operational amplifier, a Schottky diode and a measurement capacitor, the ultrasonic wave emitted by the ultrasonic transducer generates an echo when encountering a pavement, the echo passes through the ultrasonic transducer to generate a feedback electrical signal, the feedback electrical signal passes through the low noise operational amplifier, the secondary operational amplifier and the Schottky diode in sequence to charge the measurement capacitor, and the main controller MCU is configured to collect a voltage across the measurement capacitor and output a high level and a low level according to the voltage across the measurement capacitor.
8. The ultrasonic-based pavement material detection device according to claim 7, wherein the main controller MCU is further connected with a switch circuit, and the switch circuit is used for discharging the measurement capacitor; and the main controller MCU is used for outputting a high level to control the switch circuit to be switched on after the voltage at the two ends of the measuring capacitor is collected to the state.
9. The method for manufacturing a road surface material detection device based on ultrasonic waves of claim 3, characterized by comprising the following steps:
s1: welding the positive electrode and the negative electrode of the piezoelectric ceramic piece to the piezoelectric ceramic piece;
s2: adhering the piezoelectric ceramic plate to the harmonic oscillator;
s3: the piezoelectric ceramic piece and the positive electrode, the negative electrode and the harmonic oscillator thereof are arranged in the protective shell;
s4: filling the soft buffer glue into the protective shell in the previous step;
s5: welding the positive electrode and the negative electrode of the piezoelectric ceramic piece on the electrode piece;
s6: pouring the hard protective adhesive between the electrode plate and the piezoelectric ceramic plate in the previous step;
s7: welding the signal transmission line to the main control circuit board;
s8: connecting the positive electrode and the negative electrode of the electrode plate with the main control circuit board;
s9: sleeving a shell on the main control circuit board, the harmonic oscillator, the piezoelectric ceramic piece, the protective shell and the electrode piece;
s10: and injecting the soft buffer glue between the shell and the protective shell, and injecting the hard protective glue between the master control circuit board and the shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011305119.1A CN112285209A (en) | 2020-11-19 | 2020-11-19 | Pavement material detection device based on ultrasonic waves and manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011305119.1A CN112285209A (en) | 2020-11-19 | 2020-11-19 | Pavement material detection device based on ultrasonic waves and manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112285209A true CN112285209A (en) | 2021-01-29 |
Family
ID=74399339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011305119.1A Pending CN112285209A (en) | 2020-11-19 | 2020-11-19 | Pavement material detection device based on ultrasonic waves and manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112285209A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87206418U (en) * | 1987-04-18 | 1987-12-26 | 空军第六研究所 | Radio facsimile device |
| CN2164019Y (en) * | 1993-05-04 | 1994-05-04 | 陈义新 | Ultrasonic ranging unit |
| JPH07181258A (en) * | 1993-12-22 | 1995-07-21 | Aisin Seiki Co Ltd | Vehicle-mounted ultrasonic measuring instrument |
| CN2491839Y (en) * | 2001-06-14 | 2002-05-15 | 刘书民 | Highway nondestructive detector |
| WO2015093571A1 (en) * | 2013-12-18 | 2015-06-25 | 日清紡ホールディングス株式会社 | Ultrasonic sensor |
| CN213658648U (en) * | 2020-11-19 | 2021-07-09 | 瑞臻信息技术(深圳)有限公司 | Pavement material detection device based on ultrasonic wave |
-
2020
- 2020-11-19 CN CN202011305119.1A patent/CN112285209A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87206418U (en) * | 1987-04-18 | 1987-12-26 | 空军第六研究所 | Radio facsimile device |
| CN2164019Y (en) * | 1993-05-04 | 1994-05-04 | 陈义新 | Ultrasonic ranging unit |
| JPH07181258A (en) * | 1993-12-22 | 1995-07-21 | Aisin Seiki Co Ltd | Vehicle-mounted ultrasonic measuring instrument |
| CN2491839Y (en) * | 2001-06-14 | 2002-05-15 | 刘书民 | Highway nondestructive detector |
| WO2015093571A1 (en) * | 2013-12-18 | 2015-06-25 | 日清紡ホールディングス株式会社 | Ultrasonic sensor |
| CN213658648U (en) * | 2020-11-19 | 2021-07-09 | 瑞臻信息技术(深圳)有限公司 | Pavement material detection device based on ultrasonic wave |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1134875C (en) | Energy storage system | |
| CN1700991A (en) | Expendables container capable of measuring residual amount of expendables | |
| CN213658648U (en) | Pavement material detection device based on ultrasonic wave | |
| CN103477535A (en) | Power transmitting system | |
| CN101227105A (en) | Inductance coupling interval power supply device | |
| CN103698756A (en) | Front end device of portable ultrasound system | |
| CN103116157B (en) | Plasma sonar buoy | |
| CN112285209A (en) | Pavement material detection device based on ultrasonic waves and manufacturing method | |
| CN108696185A (en) | A kind of deceleration strip generating set | |
| CN206757064U (en) | A kind of nuclear magnetic resonance water detector emitter based on dynamic compensation | |
| CN106394299A (en) | Power system and electric automobile | |
| CN105676141A (en) | Battery capacity on-line measuring system and measuring method based on damped oscillation | |
| CN102035230A (en) | Equalizing charge control technology of storage battery pack | |
| CN1967279A (en) | Circuit for measuring synchronized sampler of flying capacitance | |
| CN107733276B (en) | Excitation pulse circuit for ultrasonic flaw detection | |
| EP1983600A1 (en) | Electrical circuit for decomposing and removing a solid material from a secondary battery | |
| CN1174253C (en) | Circuit and method for detecting voltage state of power supply | |
| CN211627459U (en) | Pulse width adjustable ultrasonic square wave transmitting circuit | |
| KR101753807B1 (en) | Device for battery performance recovery | |
| KR200431726Y1 (en) | battery | |
| CN208297734U (en) | Biped robot's Intelligent tracking device | |
| CN109256837A (en) | Ground magnetic resonance Multi-regulation quick high accuracy charging unit and charge control method | |
| CN208386442U (en) | A kind of deceleration strip generating set | |
| CN109194180B (en) | Ultrasonic pulse excitation circuit driven by low-voltage power supply and control method thereof | |
| KR101201220B1 (en) | Apparatus for preventing life shortening of battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |