EP1303754A1 - Device for determining the change in the density of a medium - Google Patents
Device for determining the change in the density of a mediumInfo
- Publication number
- EP1303754A1 EP1303754A1 EP01909659A EP01909659A EP1303754A1 EP 1303754 A1 EP1303754 A1 EP 1303754A1 EP 01909659 A EP01909659 A EP 01909659A EP 01909659 A EP01909659 A EP 01909659A EP 1303754 A1 EP1303754 A1 EP 1303754A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- medium
- signal
- transmission
- density
- determining
- 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.)
- Withdrawn
Links
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
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
- G01N29/4436—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a reference signal
-
- 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
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
- G01N29/075—Analysing solids by measuring propagation velocity or propagation time of acoustic waves by measuring or comparing phase angle
-
- 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
- G01N29/346—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with amplitude characteristics, e.g. modulated signal
-
- 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
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/24—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing the transmission of wave or particle radiation through the material
-
- 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
- G01N2291/028—Material parameters
- G01N2291/02818—Density, viscosity
Definitions
- the invention relates to a device for determining the change in the density of a solid, liquid or gaseous medium.
- the device is particularly capable of acting on physical and / or chemical parameters that result in changes in the density and / or compression constant of the medium, such as changes in temperature or pressure, in a chemical, biochemical or physical Reaction occur in their impact on the density of the medium.
- the change in temperature and / or pressure is only an indication to the user that the medium has achieved the desired property, e.g. that an oil has the required viscosity, that a sensitive frozen food has thawed, that a process is taking place or has taken place etc.
- Temperature and / or pressure measurement are used to set or determine a certain quality of a solid, liquid or gaseous medium.
- the device for determining the change in the density of a medium consists of a transmission device for transmitting a transmission signal with a constant frequency and amplitude, the transmission signal having at least one period and the transmission device being coupled to the medium. At least one receiving device is provided for picking up the reflected and / or transmitted response signals from the medium. The receiving device is coupled to an A / D converter and a sampling device. The transmitting device and the output of the A / D converter are connected to a numerical processing device for determining the phase shift between the transmitted signal and the received signal, the output of which is connected to a display. Instead of the display, a storage medium can also be used, from which the time course of the change in density can later be taken.
- the transmission signal is sinusoidal, in another embodiment the transmission signal is an acoustic signal.
- the device can thus be used, for example, in the ultrasound field.
- the transmission device is designed such that it can transmit two transmission signals of different frequencies, the transmission signals differing by a maximum of one period over the signal throughput time.
- the frequencies of the transmission signal it is sufficient to have an approximate knowledge of the length and the propagation speed of the transmission signal in the medium. The fact that the transmission signals only deviate by a maximum of one period over this length differentiate, is used for an accurate determination of the length of the signal through the medium.
- the transmitting device and the receiving device can consist of a switchable sensor, and the length of the transmitted signal is then at most equal to twice the distance between the sensor and the reflection point of the transmitted signal in the medium.
- a signal with the frequency f x is emitted depending on the medium and transmitter.
- a multiple of the period of the transmission signal and a multiple of the period of the scanning signal must be overmathed within path 2L.
- the sampling frequency f samp can be less than, equal to or greater than the ⁇ yquist frequency of the
- the reference transit time T x is determined by measuring the phase shift ⁇ x between the transmission signal and the reception signal when the transmission signal passes through the medium in the reference state. To measure ⁇ x , for example, 7 sampling points (this corresponds to 2 periods of the transmission signal) are selected. Then follows
- N is the number of full periods of the transmit signal within the path of the signal from the transmitter to the receiver.
- the mode of operation is as follows.
- L ⁇ AL ⁇ is negligible with regard to the changes in the physical properties of the medium relative to the change ⁇ v in the speed of the signal.
- nf x mf 2 with ⁇ n - ⁇ 1, ie within the sonicated area the transmit signals with the frequencies f x and f 2 differ by less than one period. This also means that the larger L + AL, the smaller the difference between the frequencies must be.
- the frequencies of the two signals depend on the medium, transmission characteristics, the approximate length of the sound path and the approximate signal speed in the medium.
- Two transmission signals are transmitted one after the other and the reflected or transmitted signals are sampled with the frequency in such a way that each is a multiple a full period of the corresponding signal is contained in the transmission signals.
- the sampling frequency can be selected independently of the Nyquist frequency.
- 7 sampling points can correspond to 2 periods of the first transmission signal with the frequency f x and 13 sampling points can correspond to 4 periods of the second transmission signal with the frequency f 2 ), as shown in the example above.
- the phases ⁇ EX and ⁇ E 2 of the received signals and ⁇ sx and ⁇ S 2 of the transmitted signals are measured. This can be done with the formula
- the path between the transmitting device and the receiving device is always decisive. Is there a good echo, i.e. are e.g. If there are opposing parallel walls in the medium, the method should be used in the reflection. There is then only one coupling point of the device to the medium and a maximum echo signal can be determined simply by slight displacements of the transmitting / receiving device.
- the method can be carried out both in the sound area and with the help of electromagnetic waves.
- FIG. 1 shows the basic structure of the present invention
- FIG. 2 shows a specific exemplary embodiment of the present invention.
- a generator 1 and a transmission device 2 generate a transmission signal with a constant frequency and amplitude, the transmission signal having at least one period.
- the transmission device 2 is coupled to the medium 3.
- At least one receiving device 4 is provided for receiving the reflected and / or transmitted response signals from the medium 3.
- the receiving device 4 is controlled by a sampling device 5, which is followed by an A / D converter 6.
- the transmission device 2 and the output of the A / D converter 6 are connected to a numerical processing device 7 for determining the phase shift between the transmission signal and the reception signal, the output of which is coupled to a display 8. It is also possible to connect a storage medium 9 in addition to or instead of the display. From the change in the phase shift over a certain properties of the medium can be determined subsequently.
- Receiving device 4 and the speed of the transmission signal through the medium 3 are known.
- a generator 1 and a transmission device 2 generate two transmission signals with constant frequency and amplitude simultaneously or in quick succession, the transmission signals having at least one period.
- the transmission device 2 is coupled to the medium 3.
- a receiving device 4 is provided for receiving the reflected and / or transmitted response signals from the medium 3.
- the transmitting device 2 and the receiving device 4 are coupled to identical channels, in which the signals are conditioned in a known manner and filtered in a filter 12. The signals are each mixed with the transmission signal in a mixer 13.
- Both channels are connected via a shift register 10, in which the digital values from the A / D converter 6 are located, to a numerical processing device 7 for determining the phase shift between the transmitted signal and the received signals of the two frequencies, the output of which in this case is also on a display 8 are coupled.
- This embodiment is particularly suitable for the application cases in which the length of the path from the transmitting device 2 through the medium 3 to
- Receiving device 4 and the speed of the transmission signal through the medium 3 are only approximately known. To determine the length of the path from the transmitting device 2 to the receiving device 4, two transmission signals of different frequencies are generated, which differ by only a maximum of one period over the path from the transmitting device 2 to the receiving device 4. From the
- Phase shift which is within a period due to this condition, can Length of the path from the transmitting device 2 to the receiving device 4 can be exactly determined in the calculation unit 7, as was explained in the introduction. Both signals can then be used for the further determination of phase shifts between the transmitted signal and the received signal, but one of the signals can also be switched off.
Landscapes
- Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Acoustics & Sound (AREA)
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10036567 | 2000-07-27 | ||
DE10036567A DE10036567A1 (en) | 2000-07-27 | 2000-07-27 | Device for determining the change in density of a medium |
PCT/EP2001/000580 WO2002010738A1 (en) | 2000-07-27 | 2001-01-19 | Device for determining the change in the density of a medium |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1303754A1 true EP1303754A1 (en) | 2003-04-23 |
Family
ID=7650382
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01909659A Withdrawn EP1303754A1 (en) | 2000-07-27 | 2001-01-19 | Device for determining the change in the density of a medium |
Country Status (4)
Country | Link |
---|---|
US (1) | US20030167848A1 (en) |
EP (1) | EP1303754A1 (en) |
DE (1) | DE10036567A1 (en) |
WO (1) | WO2002010738A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005009244A1 (en) * | 2003-07-24 | 2005-02-03 | HER MAJESTY THE QUEEN IN RIGHT OF CANADA asrepres ented by THE MINISTER OF NATIONAL DEFENSE | Non-invasive monitoring of intracranial dynamic effects and brain density fluctuations |
CA2510972C (en) * | 2005-06-28 | 2013-05-14 | Nimtech Inc. | Advanced ultrasonic interferometer and method of non-linear classification and indentification of matter using same |
DE102009019497B4 (en) * | 2009-05-04 | 2014-07-17 | Wittenstein Ag | Method for the examination of a medium |
US9267922B2 (en) * | 2010-09-21 | 2016-02-23 | Miroslaw Wrobel | Method and system for product supply chain assurance |
DE102011004830B4 (en) * | 2011-02-28 | 2015-10-29 | Holger Löhmer | Phase method for measuring the propagation velocity of sound waves with dynamic measurement window |
NO20130638A1 (en) * | 2013-05-06 | 2014-11-07 | Mecsense As | Device and method for continuous detection of changes in density in fluids and solids as well as use of the device |
CN108169340B (en) * | 2017-12-18 | 2019-06-21 | 中国船舶科学研究中心(中国船舶重工集团公司第七0二研究所) | A kind of electromechanical low frequency acoustic emission transducer |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB798323A (en) * | 1953-05-21 | 1958-07-16 | Coal Industry Patents Ltd | Improvements in or relating to methods of and means for detecting changes in the velocity of sound or of ultrasonic vibrations in gases |
JPS5589744A (en) * | 1978-12-27 | 1980-07-07 | Terumo Corp | Liquid density measuring method of ultrasonic wave and its unit |
US4265125A (en) * | 1979-08-02 | 1981-05-05 | Mahany Richard J | Flowmeter method and apparatus |
US4499418A (en) * | 1982-08-05 | 1985-02-12 | Texaco Inc. | Water cut monitoring means and method |
US4727311A (en) * | 1986-03-06 | 1988-02-23 | Walker Charles W E | Microwave moisture measurement using two microwave signals of different frequency and phase shift determination |
US5603325A (en) * | 1988-05-11 | 1997-02-18 | Lunar Corporation | Ultrasonic densitometer with width compensation |
US5060514A (en) * | 1989-11-30 | 1991-10-29 | Puritan-Bennett Corporate | Ultrasonic gas measuring device |
DE4224209C2 (en) * | 1991-07-23 | 1996-05-23 | Olympus Optical Co | Ultrasonic measuring device |
US5359541A (en) * | 1993-03-01 | 1994-10-25 | The Regents Of The University Of California, Office Of Technology Transfer | Fluid density and concentration measurement using noninvasive in situ ultrasonic resonance interferometry |
JP3160428B2 (en) * | 1993-07-12 | 2001-04-25 | 株式会社東芝 | Densitometer |
FI103920B1 (en) * | 1997-05-21 | 1999-10-15 | Valmet Automation Inc | Procedure for measuring gas content and gas content meter |
DE19841154C2 (en) * | 1998-09-09 | 2002-11-07 | Holger Loehmer | Method and device for measuring the transit time of sound waves |
JP2000111499A (en) * | 1998-10-02 | 2000-04-21 | Toshiba Fa Syst Eng Corp | Microwave concentration-measuring device |
US6301973B1 (en) * | 1999-04-30 | 2001-10-16 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Non-intrusive pressure/multipurpose sensor and method |
-
2000
- 2000-07-27 DE DE10036567A patent/DE10036567A1/en not_active Ceased
-
2001
- 2001-01-19 US US10/089,277 patent/US20030167848A1/en not_active Abandoned
- 2001-01-19 WO PCT/EP2001/000580 patent/WO2002010738A1/en not_active Application Discontinuation
- 2001-01-19 EP EP01909659A patent/EP1303754A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO0210738A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10036567A1 (en) | 2002-02-14 |
WO2002010738A1 (en) | 2002-02-07 |
US20030167848A1 (en) | 2003-09-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20020523 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR |
|
RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: WROBEL, MIROSLAW Owner name: GLASER, ECKARD Owner name: SONEM GMBH Owner name: GRASSMANN, JANET |
|
PUAJ | Public notification under rule 129 epc |
Free format text: ORIGINAL CODE: 0009425 |
|
32PN | Public notification |
Free format text: FESTSTELLUNG EINES RECHTSVERLUSTS (REGEL 69 (1) EPUE LETZTE ANSCHRIFT: SONEM GMBH, FLORIAN-GEYER-STRASSE 3, 97076 WUERZBURG |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20030801 |