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
  • G01N29/22—Details, e.g. general constructional or apparatus details
• • 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
  • G01N29/02—Analysing fluids
  • G01N29/036—Analysing fluids by measuring frequency or resonance of acoustic waves
• • 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
  • G01N29/02—Analysing fluids
  • G01N29/024—Analysing fluids by measuring propagation velocity or propagation time of acoustic waves
• • 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
  • G01N29/221—Arrangements for directing or focusing the acoustical waves
• • 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
  • G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
  • G01N29/348—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with frequency characteristics, e.g. single frequency signals, chirp signals
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2291/00—Indexing codes associated with group G01N29/00
  • G01N2291/01—Indexing codes associated with the measuring variable
  • G01N2291/011—Velocity or travel time
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2291/00—Indexing codes associated with group G01N29/00
  • G01N2291/02—Indexing codes associated with the analysed material
  • G01N2291/024—Mixtures
  • G01N2291/02416—Solids in liquids
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
  • G01N2291/00—Indexing codes associated with group G01N29/00
  • G01N2291/10—Number of transducers
  • G01N2291/102—Number of transducers one emitter, one receiver

Definitions

• the present invention concerns a device to detect the speed profile of concrete inside a pipeline with radial symmetry through which said concrete is caused to flow.
• the present invention faces and solves this problem by supplying a device to detect the speed profile of concrete inside a pipeline with ra ⁇ dial symmetry, through which the concrete is caused to flow.
• Said device - of the type comprising acoustical probe means, apt to send through said pipeline, and the concrete flowing therein, a supersonic ray inclined in respect of the pipeline axis, and to receive a disturbed supersonic ray in response, as well as an electronic circuit, apt to analyse the signals sent by said probe means and obtain therefrom a diagram showing the speed profile of the concrete - is characterized in that, said probe means make use of a supersonic ray of frequency between 20 and 500 KHz, and in that said electronic circuit processes the signals sent by the probe means, indicating the speed, with an updating frequency from 10 to 70 times per second, and deprives said signals from their components derived from the propagation rate in the concrete, to obtain a measurement of the speed along the acoustical axis, which is not relative and has its own
• Said detection device allows to display said speed measurements as a speed profile. Moreover, it allows measuring the flow rate, as a speed integral on the section area, and it also allows viscosity measurements as first derivatives of the speed in the space, as well as granulometry and density measurements through a statistical analysis of a packet of speed profiles.
• probe means wherein the transmitting and receiving probes coincide.
• probe means shall be applied on said pipeline so that the supersonic ray, of which use is made, is inclined by 15° to 75° in respect of the pipeline axis.
• Fig. 1 represents a block diagram of the detection device according to the invention
• Figs. 2 and 2A are diagrams illustrating, in two orthogonal sections, the application of the acoustical probe, forming part of the detection device of fig. 1, to a pipeline for concrete distribution;
• Fig. 3 illustrates the propagation, in said pipeline, of the super ⁇ sonic ray emitted by said probe into the various concrete components crossed by said ray;
• Fig. 4 represents an example of speed profile of the concrete caused to flow into a distribution pipeline, such as it is displayed in the detection device according to the invention.
• the detection device is of the type making use of a supersonic ray r_ (figs. 3 and 2), of frequency between 20 and 500 KHz, sent across the concrete flowing through a pipeline C; said device operates by detecting the disturbance appearing on the ray _r_
• the detection device is applied on the pipeline C so that the su ⁇ personic ray, of which use is made, is inclined by 15° to 75° in respect of the axis of said pipeline (fig. 2).
• said device consists of a transmitting probe 1 , which sends the supersonic ray _r suitably inclined towards the pipeline C through which the concrete flows, so as to cross this latter and be dis ⁇ turbed and propagated thereby, of a receiving probe 2, which collects the disturbed ray _r emerging from the pipeline C, and of a reception circuit to which are fed signals produced by the receiving probe 2.
• the receiving probe 2 is positioned on the same plane as the transmitting probe 1 , for ⁇ ming any angle OC therewith (see fig. 2A), and it may also coincide - it is preferably caused to coincide (as shown in fig. 2), with advantages as far as costs and simplicity of the device - with the transmitting probe.
• the signals sent by the receiving probe 2 are amplified by a logarithmic amplifier 3 > with a gain which varies according to time, that is, to the distances of the propagation points from which the signals are issued.
• the amplified signals are sent to a wattless decomposition circuit 4: this is a simple circuit (preferably, a very cheap RC unit) which re ⁇ covers the real part and the imaginary part of the signals, sending them separately to the shunting circuits 5 and 6, which are controlled by a sampling circuit 7- In the shunting circuits 5 and 6 (preferably, two simple and economic digital shunts) the real and imaginary parts of the signals are shunted.
• the shunting time base of the shunts 5 and 6 is chosen so that, to each instant there corresponds a position in space of the echo-signal advancing in the pipeline C: one thereby analyses, so as to be able to obtain the desired profile, the concrete mass moving into the pipeline C, section by section, along the axis of the supersonic ray and at preset distances from the sampling interval.
• Fig. 2 illustrates, by way of example, a series of sections s.
• the signal issued by the shunting circuit 5 is multiplied by the signal issued by the shunting circuit 6 and is sent to the correlator 9, while the signal issued by the shunting circuit 6 is changed of sign, is multiplied by the signal issued by the shunting circuit 5 and is then sent to the correlator 8.
• the correlators 8 and 9 are controlled by the sampling circuit 7- In said circuits, the real and imaginary parts of the signals of each section are correlated so that it may be possible to recover the speed, along the axis of the supersonic ray, of the particles in each section.
• the processing should occur with an updating frequency by the sampling circuit 7 of at least 10 to 70 times per second, taking into account the characteristics of very high dishomogeneity of the concrete, and the fact that concrete is usually distributed with an alternative pump, with consequent irregu ⁇ larities in its feeding motion.
• Said processor then joins again the real and imaginary parts of the signals, performing also a filtering operation, and it provides to draw from the speed values (each with its own sign) the desired profile, which is thus evidenced onto a display, as illustrated by way of example in fig. 4 (where v ⁇ indicates the speed - ordinates - and cl represents - abscissae - the diamater of the pipeline C, through which the concrete is caused to flow).

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Pathology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Biochemistry (AREA)
• Health & Medical Sciences (AREA)
• Immunology (AREA)
• General Health & Medical Sciences (AREA)
• Acoustics & Sound (AREA)
• Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
• Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)
• Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=11374110

Family Applications (1)

Country Status (12)

Families Citing this family (1)

Family Cites Families (3)

• 1996
  • 1996-04-24 IT IT96MI000812A patent/IT1282125B1/it active IP Right Grant
• 1997
  • 1997-04-23 EP EP97921721A patent/EP0900373A1/de not_active Withdrawn
  • 1997-04-23 KR KR1019980708559A patent/KR20000010637A/ko not_active Application Discontinuation
  • 1997-04-23 CA CA002252724A patent/CA2252724A1/en not_active Abandoned
  • 1997-04-23 AU AU27690/97A patent/AU712742B2/en not_active Ceased
  • 1997-04-23 BR BR9708741-6A patent/BR9708741A/pt not_active Application Discontinuation
  • 1997-04-23 TR TR1998/02142T patent/TR199802142T2/xx unknown
  • 1997-04-23 WO PCT/EP1997/002071 patent/WO1997040372A1/en not_active Application Discontinuation
  • 1997-04-23 JP JP53775297A patent/JP2001515586A/ja active Pending
  • 1997-04-23 CN CN97194823A patent/CN1219237A/zh active Pending
  • 1997-04-23 NZ NZ332504A patent/NZ332504A/xx unknown
• 1998
  • 1998-10-23 NO NO984954A patent/NO984954L/no not_active Application Discontinuation

Non-Patent Citations (1)

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