CN106643997A - Weight measuring method and device based on broadband ultrasonic distance measurement - Google Patents
Weight measuring method and device based on broadband ultrasonic distance measurement Download PDFInfo
- Publication number
- CN106643997A CN106643997A CN201610837467.0A CN201610837467A CN106643997A CN 106643997 A CN106643997 A CN 106643997A CN 201610837467 A CN201610837467 A CN 201610837467A CN 106643997 A CN106643997 A CN 106643997A
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- signal
- spring
- weight
- ultrasonic
- data processing
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/04—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring the deformation in a solid, e.g. by vibrating string
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
- Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
Abstract
The invention provides a weight measuring method and device based on broadband ultrasonic distance measurement. The weight measuring device comprises a bearing tray, springs, a transmitting ultrasonic transducer, a receiving ultrasonic transducer, an ultrasonic coupling liquid and a closed container, and is characterized in that the closed container is located below the bearing tray, the springs are vertically arranged at the lower end of the tray, the closed container is internally loaded with the ultrasonic coupling liquid, and the springs are soaked in the ultrasonic coupling liquid. The cargo weight is acquired through measuring the deformation amount of the springs by ultrasound. When the cargo is placed on the tray, the springs generate deformation, a data processing background sends a signal, the signal is converted into an ultrasonic signal through the transmitting ultrasonic transducer, the ultrasonic signal is transmitted and reflected back, and the cargo weight can be calculated through the data processing background according to the time delay of the sent signal and the received signal and the spring deformation amount acquired according to the original length of the springs. The weight measuring device has the advantages of compression resistance, waterproofness and long service life. Compared with a general electronic scale, the weight measuring device provided by the invention is more stable in reading and higher in precision.
Description
Technical field
The invention belongs to check weighing instrument, and in particular to a kind of method for measuring weight found range based on broad-band ultrasonic and device.
Background technology
For mass of object estimation and measurement be seen everywhere in life, be widely used, also become life in can not or
A scarce part.The little weight beam to the light and handy object of measurement, the counter scale in daily life, steelyard, electronic scale is big to detection
The weight sensing instrument of overrun and overload, the practicality of scale is quite big.The transport of such as dead weight cargo, dead weight cargo transport refers to actual dress
The cargo mass of load exceed appraises and decides the situation that the haulage vehicle of loading mass is travelled on highway, appraise and decide loading mass mainly for
For vehicle, the particularly bearing capacity of vehicle structure.As the restriction that cargo mass is loaded in vehicle operation, from automobile
Performance and traffic safety angle are set out and are significant.The transport of overloaded cargo not only jeopardizes the row of other vehicles on highway
The infrastructure such as car safety, also badly damaged highway, bridge, and result in the harmful competition of Market of Roadway Transportation.Therefore,
Whether goods overload is necessary detection lorry.In addition, in daily life people to health and profile aesthetic feeling
Requirement more and more higher, body weight control is also the basis of health control, and Modern Family is substantially all and has scale, complete to hold
The body weights of household.For fat-reducing personage, scale is also indispensable.
Scale is divided into mechanical scale and electronic scale again, and mechanical scale is mainly spring scale, that is, pointer scale.The critical piece of mechanical scale has
Spring, pivot, rack-and-pinion, weight is placed on table top causes spring to compress downwards, and the up and down motion of spring passes through a pivot
It is converted into lateral horizontal movement, horizontal movement is delivered to gear rack arrangement, rack-and-pinion conversion equipment will be passed over
Horizontal movement is converted into circular motion, so that pointer watch dial rotation.This pointer scale life-span length, it is practical, but
The problems such as due to machine driving, the frictional fit gap of part, precision will not be too high.The critical piece of electronic scale has weighing and sensing
Device, filtering and amplifying circuit, AD conversion module.When object is placed on the scale pan, pressure is applied to sensor, and the sensor occurs shape
Become, so that impedance changes, while making driving voltage change, export the analogue signal of a change, signal input
Analog-digital converter carries out follow-up reading process.Electronic scale small volume, lightweight, accuracy is high, and reading is continuously quick, at present extensively
Use, but while there is also some problems, such as circuit board is easy to because bearing that pressure is excessive to break down, and waterproof effect is poor, makes
Use short life.If can reduce machine driving etc. in mechanical scale affects the flow process of precision, directly obtained using the decrement of spring
To the weight of object, the series of problems that electronic scale is present can be so avoided also to solve the precision problem of mechanical scale presence.
Spring be it is a kind of using elasticity come the machine components of work, spring can produce larger deformation when being under pressure,
Mechanical energy is changed into deformation energy, making the main material of spring has stainless steel spring silk, high-quality carbon spring steel wires, endurance
Alloy spring wire etc., conventional weight sensing spring is generally the compression spring in helical spring.If using the elastic shape of antirust
The good spring of change ability, when there is weight indirect action on spring, by ultrasound measurement module the deformation quantity of spring is measured, then
The weight of object is obtained by signal processing module, the weight of object is simply directly reflected, without worrying pressure transducer
Failure, not there are problems that because precision is not enough caused by various machine drivings, and can pass through display screen directly fast fast reading yet
Number.In addition, the mode of this ultrasonic check weighing is also applied for the detection of superimposed truck simultaneously, now can be stronger with rigidity
The spring of strong pressure can be born, efficiency high stability is strong.
The content of the invention
To overcome existing electronic scale fragile, precision is low, the problems such as reading is forbidden, the invention provides a kind of based on width
The method for measuring weight and device of frequency supersonic sounding.
The present invention is realized at least through one of following technical scheme.
A kind of weight-measuring device found range based on broad-band ultrasonic, including bearing tray, spring, transmission ultrasonic transducer, reception
Ultrasonic transducer, ultrasonic coupling liquid and hermetic container, the hermetic container is located at bearing tray lower section, and spring is vertically installed in institute
Pallet lower end is stated, and spring is located in hermetic container, and the ultrasonic coupling liquid is housed in hermetic container, ultrasonic coupling in spring immersion
In closing liquid；Due to ultrasound in atmosphere propagation attenuation it is very severe, so between hermetic container and pallet built-in insulation ultrasound
Coupling liquid, the coupling liquid can preferably make to be immersed in spring therein and be difficult to get rusty, then energy does not have too in transonic
Big decay, to spring certain protection is also had；Hermetic container bottom is provided with transmission ultrasonic transducer and receives ultrasonic transducer；
When there is goods to be positioned on bearing tray, spring deforms upon and the direction below the downward container of bearing tray can be driven to move,
The signal that transmission ultrasonic transducer sends after balance is reflected through bearing tray lower end, receives ultrasonic transducer reception
The signal for arriving calculates the deformation quantity of spring, by shape after data processing module process according to the time delay between receiving and transmitting signal
Variable conversion is obtained the weight of goods.It is described to send ultrasonic transducer, receive the working band of ultrasonic transducer according to concrete
Situation can be the relatively wide piezoelectric ultrasonic transducer of bandwidth, or electric capacity micro-machined ultrasonic transducer selecting.
Further, the spring has one or many.The spring is selected according to goods weight, the load of spring with
The ratio of deformation is referred to as spring rate, and rigidity is bigger, then spring is harder.For the general carbon of body weight of general weight such as people
Spring steel wire, it is not necessary to too big rigidity, the goods of upper ton is such as used for detecting that cargo vehicle overload then needs to be answered using high
The spring of power.The pallet is used for placing weight to be measured, and spring is vertically installed in the pallet lower end.
Further, the data processing module includes data processing backstage, a/d converter and D/A converter, power amplification
Device and low-noise amplifier, power supply and weight data display；The data processing backstage be used for broadband signal generation and
The deformation quantity of spring is calculated according to the time delay of receiving and transmitting signal, the weight of goods is obtained then；Data processing backstage includes that control is single
Unit, memory element, display and signal processing unit, the carrying out of the measurement process of control unit control whole device；The AD
Transducer is easy to data processing background process, the D/A converter to be used for numeral for analogue signal to be changed into into digital signal
Signal changes into analogue signal；The power amplifier is used to amplify the analogue signal of D/A converter conversion, and the low noise is put
Big device is used to amplify from the signal that ultrasonic transducer sends is received, and the power supply is used to be powered to whole device.
Further, obtain goods weight by the deformation quantity of spring to be obtained by the following formula：,
WhereinThe modulus of rigidity of spring wire；Spring line footpath；Spring outer diameter；Spring inside diameter；Mean diameter of coil；Total coil number of spring；Active spring coils number；Unit
For。
Using the method for measuring weight of the weight-measuring device found range based on broad-band ultrasonic, it is comprised the steps of：
Step 1. weight to be measured is placed on bearing tray, is now turned on the power, and data processing backstage sends a broadband signal,
Signal is linearly or nonlinearly, to be sent to D/A converter, and digital signal becomes analogue signal, and then signal passes through a power
Amplifier is amplified；
Step 2. is sent to transmission ultrasonic transducer by the signal of power amplifier, and the signal of telecommunication is transformed into sound by transducer
Signal, spring is now in compressive state, and ultrasound is propagated in coupling liquid, encounters bearing tray bottom reflection and return, and receives super
Sonic transducer receives the signal for reflecting；
Step 3. receives ultrasonic transducer and receives the signal of return, by a low-noise amplifier amplify signal be easy to into
Row subsequent treatment, the signal after this amplification, analog-signal transitions into digital signal, is finally sent to through an a/d converter
Data processing backstage；
Step 4. data processing backstage has stored the former length of spring, and the time delay between receiving and transmitting signal can be changed into into distance,
Then the deformation quantity of spring is obtained, data processing backstage can convert it into weight and export to display, so as to obtain weight
Amount data.
Compared with prior art, the invention has the beneficial effects as follows：
1st, by the deformation quantity of ultrasonic direct measurement spring, the error for causing because of various machine drivings in the past is reduced, precision has
Improved, and for the goods of upper ton is also relatively suitable for, relative to the measuring instrument low cost whether detection goods overloads, efficiency
It is high.
2nd, this ultrasonic weight-measuring device resistance to compression, waterproof, the life-span is high, and more robust relative to general electronic scale, reading is more steady
It is fixed.
3rd, the precision comparison that supersonic sounding is carried out with broadband signal is high, therefore the certainty of measurement of the weight measured is relatively
It is high.
Description of the drawings
Fig. 1 is the ultrasonic pressure modular converter schematic diagram of the weight-measuring device found range based on broad-band ultrasonic of the present invention；
Fig. 2 is various signal processing schematic diagrams of the present invention；
Fig. 3 is the block diagram on the data processing backstage of the embodiment of the present invention；
Fig. 4 is the check weighing flow chart of steps of the embodiment of the present invention.
Specific embodiment
The present embodiment combines accompanying drawing and the specific embodiment of the present invention is described further, but the enforcement of the present invention is not limited
In this.
A kind of weight-measuring device found range based on broad-band ultrasonic, including ultrasonic pressure modular converter and data processing module.It is super
Acoustic pressure power modular converter is connected with data processing module in wired mode.
As shown in figure 1, be described ultrasonic pressure modular converter, including load-bearing plate 101, because spring can compress, so
Pallet two ends can be the two ends for sliding on lower end container 102.Ultrasound needs to be propagated in coupling liquid and is just unlikely to energy attenuation
Too much, so placing the coupling liquid 103 for being available for transonic in container 102, three springs 104 are placed in figure, the spring is prevented
Rust, according to goods weight different choice different model spring, the big more options Fine Steel Casting iron of material, the quantity of spring can be one
Root is also more to be many, if selecting three springs in figure, spring model should be consistent, and uniform force.Send
Transducer 105 and receive transducer 106 are most crucial crucial devices in whole module, device bottom are built in, for sending
Ultrasonic signal, and receive the signal returned from bearing tray bottom reflection.
As shown in Fig. 2 be described various signal processing block diagrams, including 201 data processing backstages, the He of D/A converter 202
A/d converter 205, power amplifier 203 and low-noise amplifier 204, power supply 206.Data processing backstage can send first one
Broadband signal, analogue signal is become through D/A converter by digital signal, is easy to transducer to process the signal of telecommunication, so in DA conversions
A power amplifier is added after device.The signal being received back to from transducer compares original signal necessarily has energy loss perhaps also
It is mingled with useless noise signal, so having accessed a low-noise amplifier processes the signal for being received back to come.Signal amplifies it
Afterwards through a/d converter, data processing backstage is sent to.
It is described based on broad-band ultrasonic find range method for measuring weight be：After goods is positioned on bearing tray, data processing backstage
Send a broadband signal, can be linear FM signal can also be NLFM signal, through described DA moduluss of conversion
Block, then be sent to transmission ultrasonic transducer through a power amplifier, when ultrasonic transducer is received reflect super is received
Acoustical signal, transducer is converted into the signal of telecommunication, is sent to after data processing by described low-noise amplifier and AD converters
Platform, using the time-delay calculation method computation delay of broadband signal, stored spring is former long on data processing backstage, and comprehensive original length can
Spring deformation amount is obtained, goods weight is obtained then.Described time-delay calculation method has correlation method, MPOC methods etc..
As shown in figure 3, being the block diagram on embodiment of the present invention data processing backstage, data processing backstage is used to carry out system
Overall control, sends signal and processes the signal of return, and data processing backstage can be using existing controller or control
Chip etc. is realized, it may include control unit, signal processing unit, memory element, display.Memory element can store in advance bullet
The various parameters of spring, and the time of receiving and transmitting signal.Goods weight is directly read by display.The time-delay calculation of broadband signal
Method is by taking MPOC methods as an example（Think and be only for example, the implication of each variable refers to the conventional expression of existing signal processing technology,
Repeat no more）.
With reference to Fig. 4, ultrasonic check weighing step is described：
Step 1. weight to be measured is placed on bearing tray, is now turned on the power, and data processing backstage sends a broadband signal, can be it is linear can also be it is nonlinear, be sent to D/A converter, digital signal becomes analogue signal, Ran Houxin
Number it is amplified by a power amplifier.
Step 2. is sent to transmission ultrasonic transducer by the signal of power amplifier, and transducer changes the signal of telecommunication
Into acoustical signal, spring is now in compressive state, and ultrasound is propagated in coupling liquid, encounters bearing tray bottom reflection and return, connects
Receive ultrasonic transducer and receive the signal for reflecting 。
Step 3. receives the signal that ultrasonic transducer receives return, and signal is amplified just by a low-noise amplifier
In carrying out subsequent treatment, the signal after this amplification through an a/d converter, analog-signal transitions into digital signal, finally
It is sent to data processing backstage.
Step 4. data processing backstage has stored the former length of spring, and can change into the time delay between receiving and transmitting signal
Distance, can obtain the deformation quantity of spring then, and data processing backstage can convert it into weight and export to display, this
Sample can be obtained by the result of our needs.
Claims (5)
1. it is a kind of based on broad-band ultrasonic find range weight-measuring device, it is characterised in that including bearing tray, spring, send ultrasonic transduction
Device, reception ultrasonic transducer, ultrasonic coupling liquid and hermetic container, the hermetic container is located at bearing tray lower section, and spring is vertical
The pallet lower end is arranged at, and spring is located in hermetic container, and the ultrasonic coupling liquid, spring immersion are housed in hermetic container
In middle ultrasonic coupling liquid；Hermetic container bottom is provided with transmission ultrasonic transducer and receives ultrasonic transducer；It is positioned over when there is goods
On bearing tray, spring deforms upon and the direction below the downward container of bearing tray can be driven to move, and sends super after balance
The signal that sonic transducer sends is reflected through bearing tray lower end, receives ultrasonic transducer the signal for receiving through number
After according to processing module process, the deformation quantity of spring is calculated according to the time delay between receiving and transmitting signal, it is available by deformation quantity conversion
The weight of goods.
2. it is according to claim 1 it is a kind of based on broad-band ultrasonic find range weight-measuring device, it is characterised in that the spring has
One more.
3. it is according to claim 1 it is a kind of based on broad-band ultrasonic find range weight-measuring device, it is characterised in that at the data
Reason module includes data processing backstage, a/d converter and D/A converter, power amplifier and low-noise amplifier, power supply and weight
Data display equipment；The data processing backstage is used for the generation of broadband signal and calculates spring according to the time delay of receiving and transmitting signal
Deformation quantity, obtains the weight of goods then；Data processing backstage includes control unit, memory element, display and signal processing
Unit, the carrying out of the measurement process of control unit control whole device；The a/d converter is used to for analogue signal to change into number
Word signal is easy to data processing background process, the D/A converter to be used to for digital signal to change into analogue signal；The power
Amplifier is used to amplify the analogue signal of D/A converter conversion, and the low-noise amplifier is used to amplify from reception ultrasonic transducer
The signal for sending, the power supply is used to be powered to whole device.
4. it is according to claim 1 it is a kind of based on broad-band ultrasonic find range weight-measuring device, it is characterised in that by the shape of spring
Variable obtains goods weight and is obtained by the following formula：, whereinThe rigidity of spring wire
Modulus；Spring line footpath；Spring outer diameter；Spring inside diameter；Mean diameter of coil；
Total coil number of spring；Active spring coils number；Unit be。
5., using the method for measuring weight of the weight-measuring device found range based on broad-band ultrasonic described in any one of claim 1 ~ 4, its feature exists
In comprising the steps of：
Step 1. weight to be measured is placed on bearing tray, is now turned on the power, and data processing backstage sends a broadband signal,
Signal is linearly or nonlinearly, to be sent to D/A converter, and digital signal becomes analogue signal, and then signal passes through a power
Amplifier is amplified；
Step 2. is sent to transmission ultrasonic transducer by the signal of power amplifier, and the signal of telecommunication is transformed into sound by transducer
Signal, spring is now in compressive state, and ultrasound is propagated in coupling liquid, encounters bearing tray bottom reflection and return, and receives super
Sonic transducer receives the signal for reflecting；
Step 3. receives ultrasonic transducer and receives the signal of return, by a low-noise amplifier amplify signal be easy to into
Row subsequent treatment, the signal after this amplification, analog-signal transitions into digital signal, is finally sent to through an a/d converter
Data processing backstage；
Step 4. data processing backstage has stored the former length of spring, and the time delay between receiving and transmitting signal can be changed into into distance,
Then the deformation quantity of spring is obtained, data processing backstage can convert it into weight and export to display, so as to obtain weight
Amount data.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610837467.0A CN106643997B (en) | 2016-09-22 | 2016-09-22 | Weight measuring method and device based on broadband ultrasonic ranging |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610837467.0A CN106643997B (en) | 2016-09-22 | 2016-09-22 | Weight measuring method and device based on broadband ultrasonic ranging |
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| Publication Number | Publication Date |
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| CN106643997A true CN106643997A (en) | 2017-05-10 |
| CN106643997B CN106643997B (en) | 2020-02-18 |
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ID=58852448
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| CN201610837467.0A Active CN106643997B (en) | 2016-09-22 | 2016-09-22 | Weight measuring method and device based on broadband ultrasonic ranging |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107894269A (en) * | 2017-11-13 | 2018-04-10 | 广东永衡良品科技有限公司 | A kind of electronic scale using ultrasonic measurement weight |
| CN112344888A (en) * | 2020-10-23 | 2021-02-09 | 华南理工大学 | Ultrasonic thickness measuring method based on LFM signal cross-correlation phase characteristics |
| CN113501215A (en) * | 2021-07-02 | 2021-10-15 | 宁波格劳博智能工业有限公司 | Intelligent tracing storage and transportation explosion-proof container for power battery |
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| CN106643997B (en) | 2020-02-18 |
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