WO1998014751A1 - Sensor zur berührungslosen dickenmessung an folien - Google Patents
Sensor zur berührungslosen dickenmessung an folien Download PDFInfo
- Publication number
- WO1998014751A1 WO1998014751A1 PCT/DE1996/001867 DE9601867W WO9814751A1 WO 1998014751 A1 WO1998014751 A1 WO 1998014751A1 DE 9601867 W DE9601867 W DE 9601867W WO 9814751 A1 WO9814751 A1 WO 9814751A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor
- sensor head
- sensor according
- film
- head
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
- G01B7/107—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance for measuring objects while moving
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/08—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means
- G01B7/087—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using capacitive means for measuring of objects while moving
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
- G01D5/2405—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by varying dielectric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92114—Dimensions
- B29C2948/92152—Thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92323—Location or phase of measurement
- B29C2948/92428—Calibration, after-treatment, or cooling zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92571—Position, e.g. linear or angular
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92923—Calibration, after-treatment or cooling zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B2210/00—Aspects not specifically covered by any group under G01B, e.g. of wheel alignment, caliper-like sensors
- G01B2210/62—Support for workpiece air film or bearing with positive or negative pressure
Definitions
- the invention relates to a sensor for non-contact thickness measurement on foils, in particular on blown foils, with a sensor head and a holder for the sensor head, the sensor head comprising at least one non-contact sensor element for thickness measurement working in coordination with the physical properties of the foil.
- the thickness of film strips is monitored during production with two displacement sensors arranged opposite one another by guiding the film strip between the displacement sensors.
- This sensor arrangement is problematic in practice, since displacement sensors generally show non-linear behavior within their measuring range. By fluttering of the film strip to be monitored, by different strip thicknesses or by movement of the strip towards the displacement sensors or away from the displacement sensors, measurement errors occur which can be attributed to the non-linear behavior of the displacement sensors in the measuring range.
- the known sensor arrangement is completely unsuitable for thickness measurements on blown films, since a blown film cannot be guided between the two displacement sensors. For this reason, probe arrangements for measuring the thickness of blown films have hitherto generally been used. However, since the thickness measurement should take place at a stage in the manufacturing process in which the film material is still soft and deformable, a tactile thickness measurement always leaves traces of the sensor head if it does not even lead to damage to the film strip and, in extreme cases, to tearing off the film strip.
- the invention is therefore based on the object of specifying a sensor for measuring the thickness of foils with which, on the one hand, a contactless thickness measurement, in particular also on blown foils, is possible and, on the other hand, measurement errors due to the movement of the foil in the manufacturing process are largely avoided.
- the sensor according to the invention achieves the above object by the features of claim 1.
- the sensor mentioned at the outset is designed such that the position of the sensor head can be regulated in such a way that the sensor head is at a predeterminable, at least largely constant distance from the film during the entire measuring process is held in order to maintain a defined relative position between the sensor head and the film which randomly moves towards or away from the sensor head.
- the position of the sensor head should therefore not only be adjusted once to the expected position of the film but should be controllable in such a way that the sensor head is kept at a predeterminable, at least largely constant distance from the film during the entire measuring process.
- the sensor element delivers distance-independent measurement results in a small distance range between the sensor head and the film. In this way, minor inaccuracies in the position control of the sensor head can be neglected. Also a certain time lag between the film movement and the movement of the The sensor head does not yet have a negative effect on the measuring accuracy of the sensor if the distance between the sensor head and the film lies within the distance range of the distance-independent measurement results.
- Capacitive sensor elements have proven particularly useful for measuring the thickness of blown films. Blown films are usually made of a plastic material which, as a dielectric, influences the capacitance of a capacitor arrangement. In contrast, inductive sensor elements are suitable in the case of an electrically conductive film material. Such materials interact with the field of a measuring coil and thereby influence the inductance of the measuring coil. Non-contact thickness measurements can also be carried out with optically operating sensor elements, which then requires a corresponding measuring arrangement and a suitable film material.
- the sensor head is slidably mounted in the holder. This is particularly advantageous because the position of the sensor head essentially only has to be regulated perpendicular to the transport direction of the film. With a corresponding orientation of the holder, only a one-dimensional mobility of the sensor head is required, which is easiest to implement in a linear displacement.
- Position control with the aid of a gas supply in the sensor head and at least one outlet opening arranged on the measurement side is particularly advantageous.
- Gas is conducted via the gas supply and the outlet opening at a predetermined pressure onto the measurement object, namely the film. Two effects overlap, so that an air cushion forms between the sensor head and the film.
- the film is pressed away from the sensor head due to the gas pressure, while on the other hand the film is attracted at least in the edge region of the sensor head due to the gas flowing laterally between the sensor head and the film and the resulting negative pressure.
- the gas pressure is now matched to the arrangement and geometric configuration of the outlet opening and to the back pressure of the film, an air cushion forms between the sensor head and the film, the thickness of which determines the distance between the sensor head and the film. It is particularly advantageous with this procedure that, with a suitable selection of the operating parameters, an approximately constant distance between the sensor head and the film is established after a short transient process, which adjusts itself practically during the entire measuring process.
- compressed gas as a means for position control of the sensor head also has several positive edge effects.
- the gas passed through the sensor head onto the film serves for temperature stabilization and internal cooling of the measuring arrangement. As a result, temperature-related measurement errors can be largely avoided.
- the gas can optionally also be used for the further treatment of the film material.
- the self-regulating effect of the sensor arrangement described above can be further enhanced by the special design of the sensor head.
- the measuring side of the sensor head is plate-shaped and a plurality of outlet openings are preferably arranged concentrically around the position of the sensor element, preferably in the middle of the plate. In this case, a relatively large air cushion can form in the area of the sensor element.
- the suction effect between the plate and the film can be regulated in that grooves or grooves are formed in the plate of the sensor head on the measuring side, into which the outlet openings open.
- a sensor head shows a different position control behavior depending on the orientation of the grooves and grooves.
- the distance between the sensor head and the film can be regulated in an advantageous manner via the gas pressure in connection with the dimensioning and arrangement of the outlet openings and the dimensioning, arrangement and orientation of the grooves or grooves for a given back pressure of the film.
- a tube arranged at the end of the sensor head is a suitable gas supply. It is also advantageous if the sensor head is mounted in the holder so that it can be moved over the tube.
- the bearing of the sensor head or the tube should be as low-friction as possible.
- a preferred possibility is to arrange the sensor head in the holder via air bearings, so that the sensor head can be moved essentially without friction.
- the holder could comprise a guide tube for the tube carrying the sensor head, in the wall of which passage openings for the introduction of air are formed. The tube would then be able to slide back and forth on an air cushion within the guide tube.
- the holder for the sensor head could include an adjustment device for rough adjustment of the position of the sensor head and for "stiffening" the holder of the sensor head.
- the stiffening is intended to dampen the system by suppressing high-frequency movement of the sensor head.
- a delivery device could advantageously include a controlled drive, the distance between the sensor head and the film serving as the controlled variable.
- the sensor according to the invention for non-contact thickness measurement could include an additional distance sensor. This could work, for example, capacitively, inductively or according to the ultrasound measuring principle. Other measurement methods depending on the film material, such as e.g. the optical measuring principle. Since the distance sensor is intended to roughly adjust the sensor head, it is advantageous if the distance sensor itself is also arranged on the sensor head.
- the feed device could be driven pneumatically, for example, which in particular in connection with position control of the sensor head with the aid of a Gas supply in the sensor head is advantageous.
- a pressure chamber could be formed in the guide tube through which the tube carrying the sensor head is guided.
- the tube could be provided with a pressure plate arranged in the area of the pressure chamber and oriented perpendicular to the direction of movement of the sensor head, so that the pressure plate divides the pressure chamber into two subchambers.
- each of the partial chambers is now provided with a connection to a gas line which is led into the sensor head, changes in the pressure conditions in front of the sensor head and thus changes in the distance between the sensor head and the film have a direct effect on the pressure conditions in the two partial chambers of the pressure chamber out.
- a high-frequency movement of the sensor head can be counteracted and a kind of damping and stabilization of the position of the sensor head can be achieved.
- the feed device could also be driven electrically or magnetically.
- a piezo motor could serve as the drive, for example, or a spindle in the case of a mechanical variant.
- the damping of the holder of the sensor head or the suppression of very high-frequency movements of the sensor head is particularly important if line connections are provided for feeding energy into the sensor head and / or for signal transmission between the sensor head and an evaluation / control unit.
- these line connections can be realized by very thin coaxial cables, which impair the movement of the sensor head as little as possible, but nevertheless represent a mechanical coupling between the displaceably mounted sensor head and a stationary sensor part.
- Such line connections are particularly susceptible to high-frequency movements. When the system is damped, i.e. by suppressing high-frequency movements, this weak point of the sensor according to the invention can largely be remedied.
- the energy is fed into the sensor head without contact, ie without a corresponding one Line connection between the movably mounted sensor head and a stationary sensor part.
- the energy feed could be done inductively according to the transformer principle. If, in addition, the signal transmission between the sensor head and an evaluation / control unit also takes place without contact, there is no longer any mechanical coupling between the sensor head and the stationary sensor part, so that the movement of the sensor head can take place unimpeded. A line break due to high-frequency movements of the sensor head can no longer occur here.
- the signal transmission between the sensor head and the control unit could be optical, inductive or capacitive. It is particularly advantageous to use a transmitter / receiver device for signal transmission.
- this transmitter / receiver device has a corresponding modulation device
- the signal modulation methods known from signal transmission, pulse code modulation, frequency modulation and amplitude modulation can be applied to the signals to be transmitted, so that a certain susceptibility to errors during signal transmission is also ensured leaves.
- the evaluation / control unit used in the context of the sensor according to the invention, it should also be noted that this can also be partially integrated into the sensor head.
- an oscillating circuit can already be arranged in the sensor head as part of the evaluation circuit.
- the measurement signals are primarily to be evaluated, i.e. the thickness of the film can be determined.
- the distance between the sensor head and the film can also be determined and used to control the drive of the feed device.
- the evaluation / control unit could also be equipped with electronics for monitoring the installed state of the sensor head, for checking the overall function of the sensor, for example for checking the gas pressure, and for assigning the measured thickness values to the measurement location, i.e. to the position on the slide.
- two timers could also be provided, which in addition to the thickness measurement values also record time information, via which the measurement location can then be determined.
- FIG. 1 shows a longitudinal section through a sensor according to the invention for non-contact thickness measurement on foils
- FIG. 2 shows a sensor according to the invention with a pneumatically operating delivery device
- FIG. 3 shows a further sensor according to the invention with a feed device and an actuator
- Figure 4 shows a sensor according to the invention, in which the energy supply and signal transmission takes place without contact.
- the sensor 1 is particularly suitable for non-contact thickness measurement on blown films. To produce such films, the heated starting material is extruded and blown at the same time.
- the thickness measurement with the aid of the sensor 1 according to the invention takes place during the production process at a point in time at which the film material 2 has not yet completely cooled and hardened. Such thickness measurements are carried out for quality control during the manufacturing process, in order to identify material or process-related production errors at an early stage and to be able to take countermeasures.
- the non-contact thickness measurement enables quality control here without the deformable film being impaired in any way.
- the sensor 1 shown here comprises a sensor head 3 and a holder 4 for the sensor head.
- the sensor head 3 comprises at least one non-contact sensor element (not shown here) that works in coordination with the physical properties of the film 2 for thickness measurement.
- the position of the sensor head 3 can be regulated in such a way that the sensor head 3 is kept at a predeterminable, at least largely constant, distance from the film 2 during the entire measuring process.
- any contact-free sensor element suitable for thickness measurement can be used in the context of the sensor according to the invention.
- Which measurement method is ultimately used depends crucially on the physical properties of film 2. It is advantageous if the sensor element delivers distance-independent measurement results at least in a small distance range between sensor head 3 and film 2 and the distance between sensor head 3 and film 2 also lies within the distance range of the distance-independent measurement results. Then measurements that are comparatively prone to errors can be carried out.
- the senor 1 comprises a capacitively operating sensor element for thickness measurement.
- the sensor head 3 of the sensor 1 shown here is slidably mounted in the holder 4, which is indicated by the double arrow 5.
- the sensor head 3 can then be moved perpendicular to the film 2 or to the transport direction of the film 2.
- the sensor head 3 has a gas supply 6 and a plurality of outlet openings 7 on the measurement side.
- the measuring side of the sensor head 3 is plate-shaped (8).
- One of the outlet openings 7 is only shown as an example.
- the outlet openings 7 are arranged concentrically at a certain distance around the center of the plate, where the sensor element is located.
- the outlet openings 7 open into grooves or grooves formed on the measuring side in the plate 8, which cannot be seen in FIG. 1.
- compressed air is passed through the sensor head 3 onto the film 2.
- an air cushion is formed in the area of the sensor element, i.e. the plate center, between the sensor head 3 and Slide 2 off. This is due on the one hand to the pressure exerted on the film 2 by the compressed air and on the other hand to the negative pressure between the sensor head 3 or the plate 8 and the film 2 in the edge regions of the plate 8. This is because the relative position between the sensor head and the film 2 is stabilized.
- a short settling phase there is a constant distance between the sensor head 3 and the film 2. This also applies during the transport of the film 2 in the event that the film 2 may flutter. This means that a non-contact and distance-independent thickness measurement is also possible on the running, still soft elastic Slide 2 possible.
- the compressed air emerging from the sensor head 3 also has a cooling effect, so that the thickness measurements are carried out in a constant temperature range and measurement errors due to temperature fluctuations are largely avoided.
- the sensor head 3 is arranged at the end on a tube 9 which at the same time serves as a gas supply 6 for the sensor head 3.
- the sensor head 3 is slidably mounted in the holder 4 via the tube 9.
- the holder 4 comprises a housing 10 with a guide tube 11 for the tube 9.
- passage openings 12 are formed for the introduction of air, which ultimately serve as air bearings 13 for the tube 9 and thus for the sensor head 3.
- the sensor head 3 is slidably mounted in the holder 4 essentially without friction.
- the holder of the sensor 1 could also include an additional device for rough adjustment and stabilization of the position of the sensor head.
- a sensor 1 is shown in FIG. 2 with a pneumatically operating delivery device.
- the sensor head 3 is also slidably supported here by what Double arrow 5 is indicated.
- the measuring head 3 is attached to a tube 9 which is slidably mounted in a guide tube 11.
- a pressure chamber 14 is formed in the guide tube 11, through which the tube 9 is guided.
- a pressure plate 15 is arranged on the tube 9, which is dimensioned such that it divides the pressure chamber 14 into two partial chambers 16 and 17.
- Each of the two sub-chambers 16 and 17 is connected to a gas line 18, 19, which in turn are guided into the sensor head 3.
- the dynamic pressure which builds up between the sensor head 3 and the film (not shown in FIG. 2) has a direct effect on the pressures prevailing in the subchambers 16 and 17.
- the dynamic pressure in turn is dependent on the distance between the measuring head 3 and the film.
- a change in the distance results in a pressure difference between the pressures prevailing in the two subchambers 16 and 17.
- a force is exerted on the pressure plate 15 and thus on the tube 9.
- FIG. 3 is intended to illustrate that the position of the sensor head 3 can also be stabilized with the aid of a feed device comprising an actuator.
- an actuator 20 is arranged on the holder 4 of the sensor head 3, via which the tube 9 can be moved within the guide tube 11.
- the actuator 20 can be an electrically or magnetically operated drive.
- a piezomotor or a spindle can also be used as a mechanical drive.
- the sensor 1 comprises, in addition to the sensor element 21 with which the thickness of the film is detected, a distance sensor 22 with which the distance between the sensor head 3 and the film is determined. This distance value serves as a controlled variable for the actuator 20, which is indicated in FIG.
- the sensor is implemented in the sensor system, namely that the distance sensor 22 is arranged around the sensor element 21 that detects the thickness of the film. In this way it is ensured that the distance sensor 22 actually determines the distance between the sensor element 21 and the film which is relevant for the measurement.
- both a coarse adjustment of the position of the sensor head and a stabilization of this position i.e. suppress high-frequency movements of the sensor head.
- This is particularly important if the energy supply and / or the signal transmission from the sensor head to an evaluation control circuit is via line connections.
- Such line connections must be so thin and delicate that they affect the movement of the sensor head as little as possible. As a result, however, they have only a very low mechanical stability, so that they break quickly, particularly by high-frequency movements.
- FIG. 4 shows an embodiment of the sensor 1 according to the invention, in which the energy is fed in contactlessly, namely inductively according to the transformer principle.
- a coil 24 is arranged both in the area of the guide tube 11 and in the corresponding area of the tube 9, via which the energy is fed into the sensor head 3.
- the transmission of the measurement signals from the sensor head 3 to an evaluation / control device 25, which is arranged externally, for example in the housing of the sensor 1, also takes place here in a contactless manner with the aid of a transmitter / receiver device 26.
- the signal transmission could also be done optically, for example respectively.
- part of the evaluation circuit is arranged, which comprises a preamplifier 27.
- the amplified signal is then sent to the evaluation control circuit 25.
- the measurement signal can also be modulated beforehand, for example pulse-code modulation, frequency modulation or also amplitude modulation.
- a rough adjustment of the distance between sensor head and foil is generally carried out with the aid of an additional distance sensor.
- the fine adjustment of the distance between the sensor head and the film takes place automatically by using compressed air to create a small air gap or an air cushion between the sensor head and the film, the width of which is preferably in the range of the distance-independent measurement results of the sensor element for thickness measurement.
- the sensor head is still frictionlessly mounted within the holder of the sensor, so that not only the position of the film itself is modified, but also the position of the sensor head.
- the distance between the sensor head and the film is thus kept constant by regulating the relative position between the sensor head and the film.
- teaching according to the invention is not only suitable for measuring the thickness of blown films, but is generally suitable for measuring the thickness of films made of any material.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19511939A DE19511939C2 (de) | 1995-03-31 | 1995-03-31 | Sensor zur berührungslosen Dickenmessung an Folien |
US09/269,444 US6318153B1 (en) | 1996-09-30 | 1996-09-30 | Non-contact film thickness gauging sensor |
DE59608814T DE59608814D1 (de) | 1996-09-30 | 1996-09-30 | Sensor zur berührungslosen dickenmessung an folien |
EP96945472A EP0929790B1 (de) | 1996-09-30 | 1996-09-30 | Sensor zur berührungslosen dickenmessung an folien |
JP51608698A JP3253976B2 (ja) | 1996-09-30 | 1996-09-30 | 無接触型フィルム厚み測定センサ |
PCT/DE1996/001867 WO1998014751A1 (de) | 1995-03-31 | 1996-09-30 | Sensor zur berührungslosen dickenmessung an folien |
HK00100424A HK1023616A1 (en) | 1996-09-30 | 2000-01-21 | Non-contact film thickness gauging sensor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19511939A DE19511939C2 (de) | 1995-03-31 | 1995-03-31 | Sensor zur berührungslosen Dickenmessung an Folien |
PCT/DE1996/001867 WO1998014751A1 (de) | 1995-03-31 | 1996-09-30 | Sensor zur berührungslosen dickenmessung an folien |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998014751A1 true WO1998014751A1 (de) | 1998-04-09 |
Family
ID=25962854
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1996/001867 WO1998014751A1 (de) | 1995-03-31 | 1996-09-30 | Sensor zur berührungslosen dickenmessung an folien |
Country Status (2)
Country | Link |
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DE (1) | DE19511939C2 (de) |
WO (1) | WO1998014751A1 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002031433A1 (de) * | 2000-10-09 | 2002-04-18 | Micro-Epsilon Messtechnik Gmbh & Co.Kg | Kombination von zwei sensoren, z.b. von einem kapazitiven sensor und einem auf wirbelstrom- oder ultraschallbasis arbeitendem abstandssensor, in einem gehäuse |
DE102013015303B4 (de) * | 2013-09-14 | 2016-10-13 | Audi Hungaria Motor Kft. | Vorrichtung zum Einstellen des Zahnflankenspiels in einem Stirnzahnradtrieb |
DE102016207656A1 (de) | 2015-05-05 | 2016-11-10 | Micro-Epsilon Messtechnik Gmbh & Co. Kg | Messsystem mit Temperaturkompensation und Vorrichtung mit einem solchen Messsystem |
DE102016207593A1 (de) | 2015-05-05 | 2016-11-10 | Micro-Epsilon Messtechnik Gmbh & Co. Kg | Vorrichtung und Verfahren zur Messung der Breite und der Dicke eines flächigen Objekts |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19511939C2 (de) * | 1995-03-31 | 2000-05-18 | Micro Epsilon Messtechnik | Sensor zur berührungslosen Dickenmessung an Folien |
DE59608814D1 (de) | 1996-09-30 | 2002-04-04 | Micro Epsilon Messtechnik | Sensor zur berührungslosen dickenmessung an folien |
DE19811595C1 (de) * | 1998-03-17 | 1999-10-14 | Windmoeller & Hoelscher | Verfahren und Vorrichtung zum Verhindern einer Berührung zwischen einer Schlauchfolienblase und einem diese abtastenden Sensor |
EP1191305B1 (de) * | 2000-08-19 | 2002-04-10 | Plast-Control Gerätebau GmbH | Foliendickenmessung mit Anpresskraftmessung |
DE10361161A1 (de) * | 2003-12-22 | 2005-07-21 | Voith Paper Patent Gmbh | Messvorrichtung |
DE502005003829D1 (de) | 2005-01-13 | 2008-06-05 | Plast Control Gmbh | Vorrichtung und Verfahren zur kapazitiven Vermessung von Materialien |
DE102005020222A1 (de) * | 2005-04-30 | 2006-11-02 | Vereinigung zur Förderung des Instituts für Kunststoffverarbeitung in Industrie und Handwerk an der Rhein.-Westf. Technischen Hochschule Aachen eV | Verfahren und Vorrichtung zur Messung der Wanddicke von Hohlkörpern aus nicht leitendem Werkstoff |
DE102005051675B3 (de) | 2005-10-28 | 2007-04-19 | Windmöller & Hölscher Kg | Foliendickensensor mit porösem Bläser |
EP1918672A1 (de) | 2006-11-02 | 2008-05-07 | Hch. Kündig & Cie. AG | Vorrichtung zum Verringern der Reibung zwischen zwei Körpern |
DE102007034415A1 (de) | 2007-07-20 | 2009-01-22 | Windmöller & Hölscher Kg | Foliendickensensor mit porösem Bläser |
DE102011083653A1 (de) * | 2011-09-28 | 2013-03-28 | Voith Patent Gmbh | Messvorrichtung und Messverfahren zur Messung von Bahneigenschaften |
CN104729397A (zh) * | 2013-12-24 | 2015-06-24 | 厦门三维丝环保股份有限公司 | 一种ptfe微孔薄膜厚度测试方法 |
TWI755842B (zh) * | 2020-09-04 | 2022-02-21 | 奈米趨勢科技有限公司 | 非接觸式塑膠吹袋機薄膜厚度量測裝置 |
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EP0078096A2 (de) * | 1981-10-26 | 1983-05-04 | AccuRay Corporation | Vorrichtung zum Messen blattförmigen Materials |
WO1991015730A1 (de) * | 1990-04-11 | 1991-10-17 | Micro-Epsilon Messtechnik Gmbh & Co. Kg | Dickenmesseinrichtung |
DE19511939A1 (de) * | 1995-03-31 | 1996-10-02 | Micro Epsilon Messtechnik | Sensor zur berührungslosen Dickenmessung an Folien |
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DE3435908A1 (de) * | 1984-09-29 | 1986-04-10 | Phoenix Ag, 2100 Hamburg | Vorrichtung zum beruehrungslosen messen der dicke von materialbahnen aus polymeren werkstoffen |
DE9421323U1 (de) * | 1994-06-10 | 1995-08-31 | Friedrich Theysohn GmbH, 38228 Salzgitter | Meßvorrichtung für die berührungslose Dickenmessung von bewegten Langprodukten, insbesondere Flachprodukten |
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US3358225A (en) * | 1964-03-27 | 1967-12-12 | Richard S Peugeot | Lift-off compensation for eddy current testers |
US3884076A (en) * | 1971-12-07 | 1975-05-20 | Zumbach Electronic Automatic | Measuring device |
US4339714A (en) * | 1978-07-07 | 1982-07-13 | Rolls Royce Limited | Probe having passive means transmitting an output signal by reactive coupling |
EP0078096A2 (de) * | 1981-10-26 | 1983-05-04 | AccuRay Corporation | Vorrichtung zum Messen blattförmigen Materials |
WO1991015730A1 (de) * | 1990-04-11 | 1991-10-17 | Micro-Epsilon Messtechnik Gmbh & Co. Kg | Dickenmesseinrichtung |
DE19511939A1 (de) * | 1995-03-31 | 1996-10-02 | Micro Epsilon Messtechnik | Sensor zur berührungslosen Dickenmessung an Folien |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002031433A1 (de) * | 2000-10-09 | 2002-04-18 | Micro-Epsilon Messtechnik Gmbh & Co.Kg | Kombination von zwei sensoren, z.b. von einem kapazitiven sensor und einem auf wirbelstrom- oder ultraschallbasis arbeitendem abstandssensor, in einem gehäuse |
US6822442B2 (en) | 2000-10-09 | 2004-11-23 | Micro-Epsilon Messtechnik Gmbh & Co. Kg | Sensor arrangement for detecting properties of a target |
DE102013015303B4 (de) * | 2013-09-14 | 2016-10-13 | Audi Hungaria Motor Kft. | Vorrichtung zum Einstellen des Zahnflankenspiels in einem Stirnzahnradtrieb |
DE102016207656A1 (de) | 2015-05-05 | 2016-11-10 | Micro-Epsilon Messtechnik Gmbh & Co. Kg | Messsystem mit Temperaturkompensation und Vorrichtung mit einem solchen Messsystem |
DE102016207593A1 (de) | 2015-05-05 | 2016-11-10 | Micro-Epsilon Messtechnik Gmbh & Co. Kg | Vorrichtung und Verfahren zur Messung der Breite und der Dicke eines flächigen Objekts |
WO2016177369A1 (de) | 2015-05-05 | 2016-11-10 | Micro-Epsilon Messtechnik Gmbh & Co. Kg | Vorrichtung und verfahren zur messung der breite und der dicke eines flächigen objekts |
WO2016177370A1 (de) | 2015-05-05 | 2016-11-10 | Micro-Epsilon Messtechnik Gmbh & Co. Kg | Messsystem mit temperaturkompensation und vorrichtung mit einem solchen messsystem |
US10184784B2 (en) | 2015-05-05 | 2019-01-22 | Micro-Epsilon Messtechnik Gmbh & Co. Kg | Device and method for measuring the width and thickness of a flat object |
Also Published As
Publication number | Publication date |
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DE19511939A1 (de) | 1996-10-02 |
DE19511939C2 (de) | 2000-05-18 |
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