CA2064941A1 - Apparatus and process for determining the thickness of a fatty layer - Google Patents
Apparatus and process for determining the thickness of a fatty layerInfo
- Publication number
- CA2064941A1 CA2064941A1 CA002064941A CA2064941A CA2064941A1 CA 2064941 A1 CA2064941 A1 CA 2064941A1 CA 002064941 A CA002064941 A CA 002064941A CA 2064941 A CA2064941 A CA 2064941A CA 2064941 A1 CA2064941 A1 CA 2064941A1
- Authority
- CA
- Canada
- Prior art keywords
- light
- fatty layer
- fatty
- light sources
- light sensor
- 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.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/48—Other medical applications
- A61B5/4869—Determining body composition
- A61B5/4872—Body fat
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Surgery (AREA)
- General Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Biophysics (AREA)
- Animal Behavior & Ethology (AREA)
- Pathology (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
ABSTRACT
A process and an apparatus for determining the thickness of a fatty layer are described, in which the fatty layer is illuminated at different points.
The light intensity passing out of the fatty layer is measured and conclu-sions are drawn regarding the ratio of the different intensities to the fatty layer thickness.
A process and an apparatus for determining the thickness of a fatty layer are described, in which the fatty layer is illuminated at different points.
The light intensity passing out of the fatty layer is measured and conclu-sions are drawn regarding the ratio of the different intensities to the fatty layer thickness.
Description
~0~4~
Apparatus and process for deterrnining the thickness of a fatty layer.
The invention relates to an apparatus ancl a process for determining the thickness of a fatty layer. The invention also relates to an apparatus for determining data concerning the state of health of a mammal, particu-larly a human being.
For numerous different reasons, it may be necessary to determine the thick-ness of fatty layers, particularly on the human body. One reason for this is to take planned therapeutic measures for building up or removing fatty layers on certain body parts.
Apparatuses for determining the thickness of a fatty layer are already known. They operate according to the principle of "pseudointerferometry"
or spectrometry, use being made of the fact that the muscular tissue cont-ains a large amount of water, whereas the fatty tissue contains littlewater.
As the known apparatuses do not permit sufficiently accurate measurements, the problem of the invention is to provide an apparatus or a process of the aforementioned type enabling the reliable determination of the thick-ness of a fatty layer.
In the case of the inventive apparatus, the set problem is solved by at least two light sources for illuminating the fatty layer, at least one light sensor for receiving light from the fatty layer and a device for determining the ratio or ratios of the intensities of the light components received ~y the light sensor which are due to the individual light sources, in order to determine the fatty layer thickness therefrom.
According to the inventive process, said problem is solved by illuminating the fatty layer at at least t~o different points in succession, receiving the light passing out of the fatty layer and determining the fatty layer thickness from the ratio or ratios of the intensities of the light receiYed on illuminating the different points.
:
Apparatus and process for deterrnining the thickness of a fatty layer.
The invention relates to an apparatus ancl a process for determining the thickness of a fatty layer. The invention also relates to an apparatus for determining data concerning the state of health of a mammal, particu-larly a human being.
For numerous different reasons, it may be necessary to determine the thick-ness of fatty layers, particularly on the human body. One reason for this is to take planned therapeutic measures for building up or removing fatty layers on certain body parts.
Apparatuses for determining the thickness of a fatty layer are already known. They operate according to the principle of "pseudointerferometry"
or spectrometry, use being made of the fact that the muscular tissue cont-ains a large amount of water, whereas the fatty tissue contains littlewater.
As the known apparatuses do not permit sufficiently accurate measurements, the problem of the invention is to provide an apparatus or a process of the aforementioned type enabling the reliable determination of the thick-ness of a fatty layer.
In the case of the inventive apparatus, the set problem is solved by at least two light sources for illuminating the fatty layer, at least one light sensor for receiving light from the fatty layer and a device for determining the ratio or ratios of the intensities of the light components received ~y the light sensor which are due to the individual light sources, in order to determine the fatty layer thickness therefrom.
According to the inventive process, said problem is solved by illuminating the fatty layer at at least t~o different points in succession, receiving the light passing out of the fatty layer and determining the fatty layer thickness from the ratio or ratios of the intensities of the light receiYed on illuminating the different points.
:
- 2 - 2~6A~
The invention is based on the finding that light in a fatty layer under-goes both a Rayleigh scattering and a back scattering, whilst at the same time being e~posed to absorptions. Due to the absorption, the i.ntensity of the light receiYed by the light sensor obviously decreases with the distance of the light source from the light sensor, but due to the increase of the scattering events with the increasing optical path of the light from the particular source to the sensor the reverse effect occurs. ~low-ever, the thicker the fatty layer, the longer the optical path within the latter, so that from the ratio of the intensities oE the light comp-onents received by the light sensor and which can be attributed to theindividual light sources, conclusions with regards to the thickness oE
the investigated fatty layer can be drawn.
By forming the ratio, it is also possible to calculate out external influ-ences and irregularities of the fatty layer under investigation, so that a very precise determination of the fatty layer thickness is possible.
According to a particu]arly preferred embodiment of the inventive apparatus five light sources are provided, whereof three are located in a row with the light sensor and two on an arc round the light sensor through the furthest removed from the latter of the three light sources in a row.
The three light sources on the arc are treated as a single light source during the further processing of the measured data. The tripling serves to increase the intensity of the emitted light. Thus, two intensity ratios can be formed, so that a very accurate layer thickness determination is F`Ssible .
Preferably the light sources are light emitting diodes.
~ccording to a further preferred embodiment of the invention there is a device for storing the data obtained, particularly in the form of a memory card (chip card or magnetic card). Thus, data concerning the thick-ness of the fatty layers determined in time sequence can be compared with ; one another, e.g. to evaluate the result of therapy. It is also possible - 3 ~ ~ ~6~
to use data concerning the previous course of the therapy, e.g. following a stay in a health spa, in the subsequent therapy.
In the process according to the invention before and after an illumination period, a period without illumination can be provided for calibration purposes.
A cycle of illumination at the diEferent points can be successi~ely appro~-imately 100 microseconds long. As a result of the relatively short cycle time, e~ternal influences during the measurement, such as e.g. a movement of the sensor, the light sources or the fatty layer can be minimized.
For further increasing the accuracy, the ratios determined can be stored and after in each case 200 measuring cycles a mean value can be formed from the stored ratios.
As during therapy it is frequently necessary to take account of other parameters, the invention preferably provides an apparatus for determin-ing the data concerning the state of health of a mammal, particularly a human being, which is characterized by an apparatus for determining a atty layer thickness of the aforementioned type, as well as by further measuring instruments. Thus, with respect to the fatty layers, during therapy other health parameters can be taken into account.
According to a preferred embodiment, the further measuring instruments include a spirometer, a blood pressure manometer, etc.
As the thickness of fatty layers, particularly in humans, should be in a balanced ratio to the anatomy, it is preferable for said further meas-uring instruments to include a device for determining the anatomy of themammal or human.
The device for determining the anatomy can be designed ~o as to establish the size, shoulder width, hip width and chest depth of the body. The term chest dep~h is understood to mean the distance from the sternum from 2~9~
the facing point o~ the rib cage on the back.
During the therapy for influencing the fatty layers, it may be possible that the body accumulates or flushes out water, so that there i5 no weight decrease despite the fatty layer decrease. The body weight must also be in a balanced relationship to the anat~my. Thus, preferably scales are provided.
The invention is described in greater detail hereinafter relative to non-limitative embodiment9 and the attached drawings, wherein show:
Fi8. 1 diagrammatically an embodiment o~ the inventive apparatus for determlning the thickness of a fatty layer.
Fig. 2 diagrammatically the arrangement of the light sources or the light sensor according to an embodiment of the invention~
Fig. 3 the time pattern of intensity measurements according to an embod-iment of the invention.
According to Eig. 1 the apparatus according to the invention comprises a probe 10, on which are located a light sensor 100 and light emitting diodes 200,300,410,420 and 430. The probe 10 is wired to a computer 20 and the latter to a card reader/writer 30.
Fig. 2 shows the arrangement o~ the sensor 100, as well as the light emit-ting diodes 200,300~410,420 and 430 on the front side of the probe 10.
; The operation of the inventive apparatus and process will now be explained.
The front side o~ the probe 10 carrying the light sensor and the ligh~
emitting diodes is applied to the body. The light emitting diodes are then successively activated in pulse-like manner. In each case there are dark times between the pulses for activating the light emitting diodes.
' .
206~
Fig. 3 shows the pattern o~ the intensities measured by the light sensor.
As can be seen the ou~er (~) light emitting diodes 410,420,430, then the central (M) light emittin~ diode 300 and t:hen the inner (I) light emitting diode 200 are activated and prior to the first activation, between the particular activations and after the fina] activation there are so-called "dark periods", in order to allow a calibration.
In this embodiment the apparatus is standardized to a layer thickness of 14 mm. For this layer thickness the intensities of the light components received by the individual light emitting diodes are substantially ~he same, fig. 3 showing a standardized intensity.
Tests have shown that in the case of s~all layer thicknesses o~ approximat-ely 1 mm, the ratio of the intensities of the light components emanating from the outer (A) light emitting diodes ~10,420,430 to the light comp-onents from the inner (I) diode 200 i9 approximatel~ 1:65 and for a layer thickness of approximately 28 mm 2:1. This large intensity ratio variation , range permits a very accurate layer thickness determinatlon.
As shown in fig. 3, the length of a measuring cycle is 100 microseconds.
This makes it possible to minimize external influences, e.g. by moving the probe relative to the layer to be determined.
The measured values recorded by the light sensor 100 are supplied to the computer 20, which performs a digitization of the analog measured values and calculates the intensity ratios.
~or further increasing the accuracy or for minimizing external influences on the result, the computer stores the results of 200 measuring cycles and then forms a mean value, the layer thickness then being determined from the latter. The layer thickness determined can be displayed on a monitor.
However, in the embodiment shown in fig. 1 (in addition or as an alter-native to the monitor) the card reader/writer 30 is provided. Into the ~' .
' `:
latter can be fed memory cards, e.g. chip or magnetic cards, in order to store the values determined for the fatty layer thicknesses. This provides the possibility of obtaining information on the changes to the fatty layers during therapy, so as to direct the latter at the planned result.
As stated hereinbefore, the aforementioned apparatus can form part of an apparatus for determinin8 data regarding the state of health of a mam-mal, particularly a human being and other measuring devices can also be provided. Such an apparatus, which can simultaneously record several parameters concerning the state of health Oe in particular a human, is more particularly used in spa clinics, general practices and in hospitals.
Particularly if the aEorementioned device for determining the anatomy of in particular a humanl combines a blood pressure manometer and scales within a single device, whilst obviously also providing storage means, particularly for storing data on memory cardsl a therapy can be carried out whilst taking account of all the decisive parameters. In a particu-larly simple manner the reaction o~ the body to the therapy can be incor-porated, so that an incorporation of the reaction can take p:Lace in thesense o~ a control.
The inventive features described in the description, claims and drawings can be essential both singly and in random combinations for the realization f the different embodiments o~ the invention.
The invention is based on the finding that light in a fatty layer under-goes both a Rayleigh scattering and a back scattering, whilst at the same time being e~posed to absorptions. Due to the absorption, the i.ntensity of the light receiYed by the light sensor obviously decreases with the distance of the light source from the light sensor, but due to the increase of the scattering events with the increasing optical path of the light from the particular source to the sensor the reverse effect occurs. ~low-ever, the thicker the fatty layer, the longer the optical path within the latter, so that from the ratio of the intensities oE the light comp-onents received by the light sensor and which can be attributed to theindividual light sources, conclusions with regards to the thickness oE
the investigated fatty layer can be drawn.
By forming the ratio, it is also possible to calculate out external influ-ences and irregularities of the fatty layer under investigation, so that a very precise determination of the fatty layer thickness is possible.
According to a particu]arly preferred embodiment of the inventive apparatus five light sources are provided, whereof three are located in a row with the light sensor and two on an arc round the light sensor through the furthest removed from the latter of the three light sources in a row.
The three light sources on the arc are treated as a single light source during the further processing of the measured data. The tripling serves to increase the intensity of the emitted light. Thus, two intensity ratios can be formed, so that a very accurate layer thickness determination is F`Ssible .
Preferably the light sources are light emitting diodes.
~ccording to a further preferred embodiment of the invention there is a device for storing the data obtained, particularly in the form of a memory card (chip card or magnetic card). Thus, data concerning the thick-ness of the fatty layers determined in time sequence can be compared with ; one another, e.g. to evaluate the result of therapy. It is also possible - 3 ~ ~ ~6~
to use data concerning the previous course of the therapy, e.g. following a stay in a health spa, in the subsequent therapy.
In the process according to the invention before and after an illumination period, a period without illumination can be provided for calibration purposes.
A cycle of illumination at the diEferent points can be successi~ely appro~-imately 100 microseconds long. As a result of the relatively short cycle time, e~ternal influences during the measurement, such as e.g. a movement of the sensor, the light sources or the fatty layer can be minimized.
For further increasing the accuracy, the ratios determined can be stored and after in each case 200 measuring cycles a mean value can be formed from the stored ratios.
As during therapy it is frequently necessary to take account of other parameters, the invention preferably provides an apparatus for determin-ing the data concerning the state of health of a mammal, particularly a human being, which is characterized by an apparatus for determining a atty layer thickness of the aforementioned type, as well as by further measuring instruments. Thus, with respect to the fatty layers, during therapy other health parameters can be taken into account.
According to a preferred embodiment, the further measuring instruments include a spirometer, a blood pressure manometer, etc.
As the thickness of fatty layers, particularly in humans, should be in a balanced ratio to the anatomy, it is preferable for said further meas-uring instruments to include a device for determining the anatomy of themammal or human.
The device for determining the anatomy can be designed ~o as to establish the size, shoulder width, hip width and chest depth of the body. The term chest dep~h is understood to mean the distance from the sternum from 2~9~
the facing point o~ the rib cage on the back.
During the therapy for influencing the fatty layers, it may be possible that the body accumulates or flushes out water, so that there i5 no weight decrease despite the fatty layer decrease. The body weight must also be in a balanced relationship to the anat~my. Thus, preferably scales are provided.
The invention is described in greater detail hereinafter relative to non-limitative embodiment9 and the attached drawings, wherein show:
Fi8. 1 diagrammatically an embodiment o~ the inventive apparatus for determlning the thickness of a fatty layer.
Fig. 2 diagrammatically the arrangement of the light sources or the light sensor according to an embodiment of the invention~
Fig. 3 the time pattern of intensity measurements according to an embod-iment of the invention.
According to Eig. 1 the apparatus according to the invention comprises a probe 10, on which are located a light sensor 100 and light emitting diodes 200,300,410,420 and 430. The probe 10 is wired to a computer 20 and the latter to a card reader/writer 30.
Fig. 2 shows the arrangement o~ the sensor 100, as well as the light emit-ting diodes 200,300~410,420 and 430 on the front side of the probe 10.
; The operation of the inventive apparatus and process will now be explained.
The front side o~ the probe 10 carrying the light sensor and the ligh~
emitting diodes is applied to the body. The light emitting diodes are then successively activated in pulse-like manner. In each case there are dark times between the pulses for activating the light emitting diodes.
' .
206~
Fig. 3 shows the pattern o~ the intensities measured by the light sensor.
As can be seen the ou~er (~) light emitting diodes 410,420,430, then the central (M) light emittin~ diode 300 and t:hen the inner (I) light emitting diode 200 are activated and prior to the first activation, between the particular activations and after the fina] activation there are so-called "dark periods", in order to allow a calibration.
In this embodiment the apparatus is standardized to a layer thickness of 14 mm. For this layer thickness the intensities of the light components received by the individual light emitting diodes are substantially ~he same, fig. 3 showing a standardized intensity.
Tests have shown that in the case of s~all layer thicknesses o~ approximat-ely 1 mm, the ratio of the intensities of the light components emanating from the outer (A) light emitting diodes ~10,420,430 to the light comp-onents from the inner (I) diode 200 i9 approximatel~ 1:65 and for a layer thickness of approximately 28 mm 2:1. This large intensity ratio variation , range permits a very accurate layer thickness determinatlon.
As shown in fig. 3, the length of a measuring cycle is 100 microseconds.
This makes it possible to minimize external influences, e.g. by moving the probe relative to the layer to be determined.
The measured values recorded by the light sensor 100 are supplied to the computer 20, which performs a digitization of the analog measured values and calculates the intensity ratios.
~or further increasing the accuracy or for minimizing external influences on the result, the computer stores the results of 200 measuring cycles and then forms a mean value, the layer thickness then being determined from the latter. The layer thickness determined can be displayed on a monitor.
However, in the embodiment shown in fig. 1 (in addition or as an alter-native to the monitor) the card reader/writer 30 is provided. Into the ~' .
' `:
latter can be fed memory cards, e.g. chip or magnetic cards, in order to store the values determined for the fatty layer thicknesses. This provides the possibility of obtaining information on the changes to the fatty layers during therapy, so as to direct the latter at the planned result.
As stated hereinbefore, the aforementioned apparatus can form part of an apparatus for determinin8 data regarding the state of health of a mam-mal, particularly a human being and other measuring devices can also be provided. Such an apparatus, which can simultaneously record several parameters concerning the state of health Oe in particular a human, is more particularly used in spa clinics, general practices and in hospitals.
Particularly if the aEorementioned device for determining the anatomy of in particular a humanl combines a blood pressure manometer and scales within a single device, whilst obviously also providing storage means, particularly for storing data on memory cardsl a therapy can be carried out whilst taking account of all the decisive parameters. In a particu-larly simple manner the reaction o~ the body to the therapy can be incor-porated, so that an incorporation of the reaction can take p:Lace in thesense o~ a control.
The inventive features described in the description, claims and drawings can be essential both singly and in random combinations for the realization f the different embodiments o~ the invention.
Claims (14)
1. Process for determining the thickness of a fatty layer, in which the fatty layer is successively illuminated by means of at least two light sources, which engage on the fatty layer at different points, the scattered light of the light sources from the fatty layer being received by at least one light sensor, which at a different distance from the at least two light sources engages on the fatty layer and the fatty layer thickness is determined from the ratios of the scattered light intensities of the light emitted at the diff-erent points during the illumination of the fatty layer and received by the at least one light sensor.
2. Process according to claim 1, characterized in that there is an illu-mination-free period before and after an illumination period.
3. Process according to claims 1 or 2, characterized in that a cycle of illuminating the fatty layer at the different points in succession is approximately 100 ?s long.
4. Process according to one of the claims 1 to 3, characterized in that the ratios determined are stored and after in each case 200 measuring cycles a mean value is formed from the stored ratios.
5. Process according to one of the claims 1 to 4, characterized in that the layer thicknesses determined are stored.
6. Process according to claim 5, characterized in that the storage medium is a memory card.
7. Apparatus for performing the process according to one of the preceding claims, with at least two light sources (200,300,410,420,430) for illuminating the fatty layer, at least one light sensor (100) for receiving the scattered light from the fatty layer and a device (20) for determining the ratio or ratios of intensities of the scattered light quantities received by the light sensor (100).
8. Apparatus according to claim 7, characterized in that five light sources (200,300,410,420,430) are provided, whereof three (200,300, 420) are located in a row with the light sensor (100) and two (410, 430) are located on an arc around the light sensor (100) through the furthest (420) of the three light sources (200,300,420) in a row from the light sensor (100).
9. Apparatus according to claims 7 or 8, characterized in that the light sources (200,300,410,420,430) are light emitting diodes.
10. Use of the apparatus according to one of the claims 7 to 9, whilst employing further measuring instruments.
11. Use according to claim 10, characterized in that the further measuring instruments include a spirometer, a blood pressure manometer, etc.
12. Use according to claims 10 or 11, characterized in that the further measuring instruments include a device for determining the anatomy of the mammal or human being.
13. Use according to claim 12, characterized in that the device for deter-mining the anatomy is designed to determine the size, shoulder width, hip width and chest depth of the body.
14. Use according to one of the claims 10 to 13, characterized in that the measuring device also incorporates scales.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4113749A DE4113749A1 (en) | 1991-04-26 | 1991-04-26 | DEVICE AND METHOD FOR DETERMINING THE THICKNESS OF A FAT LAYER |
| DEP4113749.3 | 1991-04-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2064941A1 true CA2064941A1 (en) | 1992-10-27 |
Family
ID=6430468
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002064941A Abandoned CA2064941A1 (en) | 1991-04-26 | 1992-04-02 | Apparatus and process for determining the thickness of a fatty layer |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0516251B1 (en) |
| AT (1) | ATE142776T1 (en) |
| AU (1) | AU1509692A (en) |
| CA (1) | CA2064941A1 (en) |
| DE (2) | DE4113749A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT403243B (en) * | 1995-12-12 | 1997-12-29 | Moeller Reinhard Dr | Diagnostic device |
| DE29601025U1 (en) * | 1996-01-22 | 1996-03-14 | CSB-System Software-Entwicklung & Unternehmensberatung AG, 52511 Geilenkirchen | Arrangement of non-invasive measurement data acquisition and evaluation devices for animal body assessment for integration into EDP systems |
| GB2323440A (en) * | 1997-03-17 | 1998-09-23 | Johnson & Johnson Medical | Measuring thickness of a layer within a body |
| JP4701468B2 (en) * | 1998-12-24 | 2011-06-15 | パナソニック電工株式会社 | Biological information measuring device |
| US7720527B2 (en) | 2003-11-14 | 2010-05-18 | Panasonic Corp. | Subcutaneous fat thickness measuring method, subcutaneous fat thickness measuring apparatus, program and recording medium |
| KR100829217B1 (en) | 2006-03-27 | 2008-05-14 | 삼성전자주식회사 | Body fat sensing device and method for operating the device |
| KR100827138B1 (en) | 2006-08-10 | 2008-05-02 | 삼성전자주식회사 | Apparatus for measuring living body information |
| KR100829214B1 (en) | 2006-08-31 | 2008-05-14 | 삼성전자주식회사 | Body fat measurement appratus and method for operating the appratus |
| US20100168551A1 (en) | 2006-11-14 | 2010-07-01 | Medizinische Universität Graz | Determining a Thickness of a Layer of Fat of an Organism |
| KR100905571B1 (en) | 2007-07-19 | 2009-07-02 | 삼성전자주식회사 | Apparatus for measuring living body information |
| CN114403023B (en) * | 2021-12-20 | 2023-04-18 | 北京市农林科学院智能装备技术研究中心 | Pig feeding method, device and system based on terahertz fat thickness measurement |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3435242A (en) * | 1964-02-05 | 1969-03-25 | Industrial Nucleonics Corp | Formation inspecting arrangement |
| SE383922B (en) * | 1974-04-26 | 1976-04-05 | Svenska Traeforskningsinst | DEVICE FOR LAYER THICKNESS DETERMINATION ALTERNATIVE SURFACE PHOTOGRAPHY |
| CH572309A5 (en) * | 1974-06-05 | 1976-02-13 | Hofstetter Karl | |
| GB1549065A (en) * | 1976-11-13 | 1979-08-01 | Pigs Marketing Board Northern | Apparatus for measuring thuckness of a layer |
| US5014713A (en) * | 1989-12-05 | 1991-05-14 | Tarris Enterprises, Inc. | Method and apparatus for measuring thickness of fat using infrared light |
-
1991
- 1991-04-26 DE DE4113749A patent/DE4113749A1/en active Granted
-
1992
- 1992-03-19 EP EP92250064A patent/EP0516251B1/en not_active Expired - Lifetime
- 1992-03-19 AT AT92250064T patent/ATE142776T1/en not_active IP Right Cessation
- 1992-03-19 DE DE59207088T patent/DE59207088D1/en not_active Expired - Lifetime
- 1992-04-02 CA CA002064941A patent/CA2064941A1/en not_active Abandoned
- 1992-04-23 AU AU15096/92A patent/AU1509692A/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| DE59207088D1 (en) | 1996-10-17 |
| AU1509692A (en) | 1992-10-29 |
| DE4113749C2 (en) | 1993-05-06 |
| ATE142776T1 (en) | 1996-09-15 |
| EP0516251A2 (en) | 1992-12-02 |
| EP0516251B1 (en) | 1996-09-11 |
| EP0516251A3 (en) | 1994-02-09 |
| DE4113749A1 (en) | 1992-11-05 |
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