CA2296472C - Device for detecting position - Google Patents
Device for detecting position Download PDFInfo
- Publication number
- CA2296472C CA2296472C CA002296472A CA2296472A CA2296472C CA 2296472 C CA2296472 C CA 2296472C CA 002296472 A CA002296472 A CA 002296472A CA 2296472 A CA2296472 A CA 2296472A CA 2296472 C CA2296472 C CA 2296472C
- Authority
- CA
- Canada
- Prior art keywords
- signal
- acoustic signal
- waveguide
- travel path
- coupler
- 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.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/14—Systems for determining distance or velocity not using reflection or reradiation using ultrasonic, sonic, or infrasonic waves
Abstract
The invention relates to an apparatus for detecting the position of an object moveable along a predetermined travel path, comprising:
an acoustic signal waveguide extending along the travel path and having a predetermined, uniform speed of propagation of sound;
a signal input coupler located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, at least one signal output coupler being arranged at one end of the acoustic signal waveguide and being connected to an evaluation unit for determining the propagation-time of the sound signal from a position at which it is coupled in to the at least one signal output coupler and for generating a signal representative of the instantaneous position of the moveable object on the travel path, wherein the signal input coupler couples in, as acoustic signal, adjacent pulses having a varying time interval.
an acoustic signal waveguide extending along the travel path and having a predetermined, uniform speed of propagation of sound;
a signal input coupler located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, at least one signal output coupler being arranged at one end of the acoustic signal waveguide and being connected to an evaluation unit for determining the propagation-time of the sound signal from a position at which it is coupled in to the at least one signal output coupler and for generating a signal representative of the instantaneous position of the moveable object on the travel path, wherein the signal input coupler couples in, as acoustic signal, adjacent pulses having a varying time interval.
Description
DEVICE FOR DETECTING POSITION
FIELD OF THE INVENTION
The invention relates to an apparatus for detecting the position of an object which can move along a predefined path. Such apparatus may be used for controlling the position of a lift cage or the like and thus ensuring its positioning at predetermined stops according to floor levels.
BACKGROUND OF THE INVENTION
European patent 694 792 discloses an apparatus of this type for detecting the position of a movable object, which has an acoustic signal waveguide which extends along a travel path and has a predetermined, uniform speed of propagation of sound, and has a signal input coupler, which is connected to a signal generator and is located on the movable object, to couple an acoustic signal into the acoustic signal waveguide. In this case, signal output couplers are arranged at both ends of the acoustic signal waveguide and are each connected to a counter, the two counters being clocked by a clock generator and connected to a subtracter for the output signals from the two counters. The output signal from the subtracter, as a measure of the propagation-time difference of the acoustic signal coupled in from the point at which it is coupled in to the signal output couplers, can be processed by an evaluation unit to form a signal which is representative of the instantaneous position of the movable object on the travel path, the signal input coupler operating with a signal spacing which is greater than the propagation time of sound from one end of the travel path to the other. If the movable object is at a standstill, standing waves can form, depending on the position of the object, as the result of reflections of the acoustic signal at the ends of the acoustic signal waveguide, and can lead to measurement problems as a result of fluctuations in amplitude.
SUMMARY OF THE INVENTION
It is an object of an aspect of the invention to provide an apparatus for detecting the position of an object which can be moved along a prescribed path, with which it is possible to pick up measured values even when the object is at a standstill.
An apparatus for detecting the position of an object moveable along a predetermined travel path in accordance with the present invention comprises an acoustic signal waveguide extending along the travel path and having a predetermined, uniform speed of propagation of sound;
a signal input coupler located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, at least one signal output coupler being arranged at one end of the acoustic signal waveguide and being connected to an evaluation unit for determining the propagation-time of the sound signal from a position at which it is coupled in to the at least one signal output coupler and for generating a signal representative of the instantaneous position of the moveable object on the travel path, wherein the signal input coupler couples in, as acoustic signal, adjacent pulses having a varying time interval.
By varying the time intervals between successive pulses fed into the acoustic signal waveguide, it is possible to pick up valid measured values even in unfavourable stopping positions of the movable object, since in this case the standing wave is shifted as the result of variation of the repetition time, and thus evaluation outside the oscillation nodes of the said wave is made possible.
FIELD OF THE INVENTION
The invention relates to an apparatus for detecting the position of an object which can move along a predefined path. Such apparatus may be used for controlling the position of a lift cage or the like and thus ensuring its positioning at predetermined stops according to floor levels.
BACKGROUND OF THE INVENTION
European patent 694 792 discloses an apparatus of this type for detecting the position of a movable object, which has an acoustic signal waveguide which extends along a travel path and has a predetermined, uniform speed of propagation of sound, and has a signal input coupler, which is connected to a signal generator and is located on the movable object, to couple an acoustic signal into the acoustic signal waveguide. In this case, signal output couplers are arranged at both ends of the acoustic signal waveguide and are each connected to a counter, the two counters being clocked by a clock generator and connected to a subtracter for the output signals from the two counters. The output signal from the subtracter, as a measure of the propagation-time difference of the acoustic signal coupled in from the point at which it is coupled in to the signal output couplers, can be processed by an evaluation unit to form a signal which is representative of the instantaneous position of the movable object on the travel path, the signal input coupler operating with a signal spacing which is greater than the propagation time of sound from one end of the travel path to the other. If the movable object is at a standstill, standing waves can form, depending on the position of the object, as the result of reflections of the acoustic signal at the ends of the acoustic signal waveguide, and can lead to measurement problems as a result of fluctuations in amplitude.
SUMMARY OF THE INVENTION
It is an object of an aspect of the invention to provide an apparatus for detecting the position of an object which can be moved along a prescribed path, with which it is possible to pick up measured values even when the object is at a standstill.
An apparatus for detecting the position of an object moveable along a predetermined travel path in accordance with the present invention comprises an acoustic signal waveguide extending along the travel path and having a predetermined, uniform speed of propagation of sound;
a signal input coupler located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, at least one signal output coupler being arranged at one end of the acoustic signal waveguide and being connected to an evaluation unit for determining the propagation-time of the sound signal from a position at which it is coupled in to the at least one signal output coupler and for generating a signal representative of the instantaneous position of the moveable object on the travel path, wherein the signal input coupler couples in, as acoustic signal, adjacent pulses having a varying time interval.
By varying the time intervals between successive pulses fed into the acoustic signal waveguide, it is possible to pick up valid measured values even in unfavourable stopping positions of the movable object, since in this case the standing wave is shifted as the result of variation of the repetition time, and thus evaluation outside the oscillation nodes of the said wave is made possible.
Further objects, embodiments and advantages of the invention will become apparent from the following description and the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained in more detail below with reference to a preferred embodiment illustrated schematically in the appended drawings.
Fig. 1 shows, schematically, an embodiment of an apparatus for detecting position according to the invention.
Fig. 2 shows a timing diagram relating to the signals of the apparatus from Fig. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The apparatus shown for detecting position, which can be used in particular for detecting the position of a lift cage, comprises a acoustic signal waveguide 1, for example a steel rail or in particular a wire, which extends along a predefined travel path, along which a moveable object 2, for example a lift cage, can be moved to and fro. The acoustic signal waveguide 1 having a predetermined, uniform speed of propagation of sound, is clamped or held in a damped manner at both ends in a damping clamp or mounting 3.
The moveable object 2 carries a signal input coupler 4 which is connected to a signal generator 5, for example an oscillator, via a signal matching circuit 4'. The signal input coupler 4, which in particular operates inductively, couples an acoustic signal, which periodically includes a synchronization pulses S received from the signal generator 5, into the acoustic signal waveguide 1. The synchronization pulses S have a clock period greater than the duration of the propagation of the acoustic signal from one end of the acoustic signal waveguide 1 to the other.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be explained in more detail below with reference to a preferred embodiment illustrated schematically in the appended drawings.
Fig. 1 shows, schematically, an embodiment of an apparatus for detecting position according to the invention.
Fig. 2 shows a timing diagram relating to the signals of the apparatus from Fig. 1.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The apparatus shown for detecting position, which can be used in particular for detecting the position of a lift cage, comprises a acoustic signal waveguide 1, for example a steel rail or in particular a wire, which extends along a predefined travel path, along which a moveable object 2, for example a lift cage, can be moved to and fro. The acoustic signal waveguide 1 having a predetermined, uniform speed of propagation of sound, is clamped or held in a damped manner at both ends in a damping clamp or mounting 3.
The moveable object 2 carries a signal input coupler 4 which is connected to a signal generator 5, for example an oscillator, via a signal matching circuit 4'. The signal input coupler 4, which in particular operates inductively, couples an acoustic signal, which periodically includes a synchronization pulses S received from the signal generator 5, into the acoustic signal waveguide 1. The synchronization pulses S have a clock period greater than the duration of the propagation of the acoustic signal from one end of the acoustic signal waveguide 1 to the other.
In addition, the signal input coupler 4 couples in additional pulses M, specifically a large number of additional pulses M, during each clock period of the synchronization pulses S. The clock period of the additional pulses M is such that a distance resolution, needed for example for braking and for moving to an exact position of the object 2, is achieved in the direction of the travel path.
The synchronization pulses S are marked, that is to say can be distinguished from the additional pulses M during the evaluation. The marking can be made, for example, by their clock period being an appropriate multiple of the clock period of the additional pulses M, and additionally by their temporal offset in relation to the additional pulses M, for example by one half clock period, cf. the pulse train generated by the signal generator 5 in the first line of Fig. 2. Then, a predetermined number of m additional pulses M follows a synchronization pulse S in each case.
However, marking can also be made in an other way, thus the synchronization pulses S can be distinguished from the additional pulses M
by modulation, pulse width, pulse height or the like.
The synchronization and additional pulses S, M to be coupled in may be short electromagnetic pulses, for example simple pulses or pulse trains, or periodic frequency shift keying. The synchronization pulses S are used when the travel path is very long, for example in lifts in multi-storey buildings, in which case the necessary distance resolution leads to new pulses being coupled into the acoustic signal waveguide 1 before a preceding pulse has reached the end of the signal waveguide 1.
A signal output coupler 6 is arranged in each case at the ends of the acoustic signal waveguide 1. This is preferably a piezoelectric signal output coupler 6, however those operating inductively or capacitively can also be used.
In order that the signal output coupler 6 can pick up an evaluable signal even when the object 2 is at a standstill, and therefore the signal generator 5 is in an unfavourable stopping position thereof, and does not operate in an oscillation node of a standing wave produced by reflection at the end of the acoustic signal waveguide 1, the additional pulses M are coupled in with a varying time interval, as emerges from the signal illustrated in Fig. 2 and fed into the acoustic signal waveguide 1. The time interval of the additional pulses M is expediently jittered by 0.1 ms, for example, around a mean value of, for example, 1.0 ms. This variation can be carried out in a predetermined sequence or else randomly, and preferably with a predetermined variability around the mean value.
Each signal output coupler 6 is connected to a signal matching circuit 7 whose output lines in each case lead to a counter 8. Both the counters 8 are clocked by a clock generator 9, an oscillator. The clock time of the clock generator 9 is considerably lower than the propagation time of the sound from one end of the acoustic signal waveguide 1 to the other and is selected in accordance with the desired measurement path resolution. The outputs from the counters 8 are fed to a subtracter 10, which forms the difference of the output signals of the counters 8 and feeds it to an evaluation unit 11, for example a microprocessor, where the output signal from the subtracter 10 is evaluated.
The synchronization pulses S are used to indicate to the evaluation unit 11 which following pairs of additional pulses belong to each other, namely the respective nth, that is to say the first, second, third and so on, additional pulses M arriving at the two signal output couplers 6 (designated by A and B in Fig. 2) at different times Ta and Tb following the respective synchronization pulse S, in order that the evaluation unit 11 can detect or determine the associated absolute time difference Ta - Tb = 0T
between associated additional pulses M, and hence the position of the object 2. The jittering of the additional pulses M has no influence on this, since the time difference is absolute.
The evaluation in order to detect the position is primarily carried out in relation to the additional signals M, however the synchronization pulses S can also be evaluated in this regard, specifically above all but not exclusively when the respective mth additional pulse is specially marked, in order in this way to serve as a synchronization pulse S.
If the movable object 2 is located in the centre between the signal output couplers 6, the outputs from the counters 8 are equal and their difference is zero. If the object 2 (in the case of a vertical path) is located above the centre, the output from the counter 8 which is connected to the upper signal output coupler 6 is smaller than that of the other. From the propagation time difference of the additional pulses M belonging together in the acoustic signal waveguide 1, determined by the subtracter 10, and the known sound speed in the latter, there results the distance of the movable object 2 from the centre. Since the difference would have a different sign if the movable object 2 were to be located below the centre, it is also known whether the movable object 2 is located above or below the centre, that is to say the exact position of the movable object 2 can thus be calculated. A
digital or analog position signal which can be generated by the evaluation unit 11 can be used for tracking control.
A monitoring circuit 12 (watchdog) of the evaluation unit 11 can be used for the simple monitoring of the measurement path in the case of an input coupling which is constant over time of the input coupling signal. In the case of a contamination which is capable of damping the signal on the acoustic signal waveguide 1, the difference determined by the subtracter 10 exceeds a predetermined value, to which the monitoring circuit 12 responds in order to trigger a corresponding alarm signal or the like.
The speed of sound in a acoustic signal waveguide 1 made of steel is approximately 5300 m/s. In the case of a time resolution of 188 ns, for which a clock generator frequency of 5.3 MHz is necessary, the location resolution of the measurement path is about 1 mm.
Instead of being coupled to the signal generator 5, the signal input coupler 4 may be triggered by evaluation unit 11 to couple the acoustic signals into the signal waveguide 1. Instead it is also possible that the signal input coupler 4 triggers the evaluation unit 11 via an electric signal to define the temporal start of each coupling of an acoustic signal into the signal waveguide 1 for the evaluation to be done by the evaluation unit 11.
Instead of the preferred provision of a signal output coupler 6 at each of the two ends of the signal waveguide 1, only one signal output coupler 6 provided at one of the ends of the signal waveguide 1 may be used.
While the invention has been shown and described with reference to a preferred embodiment, it should be apparent to one of ordinary skill in the art that many changes and modifications may be made without departing from the spirit and scope of the invention as defined in the claims.
The synchronization pulses S are marked, that is to say can be distinguished from the additional pulses M during the evaluation. The marking can be made, for example, by their clock period being an appropriate multiple of the clock period of the additional pulses M, and additionally by their temporal offset in relation to the additional pulses M, for example by one half clock period, cf. the pulse train generated by the signal generator 5 in the first line of Fig. 2. Then, a predetermined number of m additional pulses M follows a synchronization pulse S in each case.
However, marking can also be made in an other way, thus the synchronization pulses S can be distinguished from the additional pulses M
by modulation, pulse width, pulse height or the like.
The synchronization and additional pulses S, M to be coupled in may be short electromagnetic pulses, for example simple pulses or pulse trains, or periodic frequency shift keying. The synchronization pulses S are used when the travel path is very long, for example in lifts in multi-storey buildings, in which case the necessary distance resolution leads to new pulses being coupled into the acoustic signal waveguide 1 before a preceding pulse has reached the end of the signal waveguide 1.
A signal output coupler 6 is arranged in each case at the ends of the acoustic signal waveguide 1. This is preferably a piezoelectric signal output coupler 6, however those operating inductively or capacitively can also be used.
In order that the signal output coupler 6 can pick up an evaluable signal even when the object 2 is at a standstill, and therefore the signal generator 5 is in an unfavourable stopping position thereof, and does not operate in an oscillation node of a standing wave produced by reflection at the end of the acoustic signal waveguide 1, the additional pulses M are coupled in with a varying time interval, as emerges from the signal illustrated in Fig. 2 and fed into the acoustic signal waveguide 1. The time interval of the additional pulses M is expediently jittered by 0.1 ms, for example, around a mean value of, for example, 1.0 ms. This variation can be carried out in a predetermined sequence or else randomly, and preferably with a predetermined variability around the mean value.
Each signal output coupler 6 is connected to a signal matching circuit 7 whose output lines in each case lead to a counter 8. Both the counters 8 are clocked by a clock generator 9, an oscillator. The clock time of the clock generator 9 is considerably lower than the propagation time of the sound from one end of the acoustic signal waveguide 1 to the other and is selected in accordance with the desired measurement path resolution. The outputs from the counters 8 are fed to a subtracter 10, which forms the difference of the output signals of the counters 8 and feeds it to an evaluation unit 11, for example a microprocessor, where the output signal from the subtracter 10 is evaluated.
The synchronization pulses S are used to indicate to the evaluation unit 11 which following pairs of additional pulses belong to each other, namely the respective nth, that is to say the first, second, third and so on, additional pulses M arriving at the two signal output couplers 6 (designated by A and B in Fig. 2) at different times Ta and Tb following the respective synchronization pulse S, in order that the evaluation unit 11 can detect or determine the associated absolute time difference Ta - Tb = 0T
between associated additional pulses M, and hence the position of the object 2. The jittering of the additional pulses M has no influence on this, since the time difference is absolute.
The evaluation in order to detect the position is primarily carried out in relation to the additional signals M, however the synchronization pulses S can also be evaluated in this regard, specifically above all but not exclusively when the respective mth additional pulse is specially marked, in order in this way to serve as a synchronization pulse S.
If the movable object 2 is located in the centre between the signal output couplers 6, the outputs from the counters 8 are equal and their difference is zero. If the object 2 (in the case of a vertical path) is located above the centre, the output from the counter 8 which is connected to the upper signal output coupler 6 is smaller than that of the other. From the propagation time difference of the additional pulses M belonging together in the acoustic signal waveguide 1, determined by the subtracter 10, and the known sound speed in the latter, there results the distance of the movable object 2 from the centre. Since the difference would have a different sign if the movable object 2 were to be located below the centre, it is also known whether the movable object 2 is located above or below the centre, that is to say the exact position of the movable object 2 can thus be calculated. A
digital or analog position signal which can be generated by the evaluation unit 11 can be used for tracking control.
A monitoring circuit 12 (watchdog) of the evaluation unit 11 can be used for the simple monitoring of the measurement path in the case of an input coupling which is constant over time of the input coupling signal. In the case of a contamination which is capable of damping the signal on the acoustic signal waveguide 1, the difference determined by the subtracter 10 exceeds a predetermined value, to which the monitoring circuit 12 responds in order to trigger a corresponding alarm signal or the like.
The speed of sound in a acoustic signal waveguide 1 made of steel is approximately 5300 m/s. In the case of a time resolution of 188 ns, for which a clock generator frequency of 5.3 MHz is necessary, the location resolution of the measurement path is about 1 mm.
Instead of being coupled to the signal generator 5, the signal input coupler 4 may be triggered by evaluation unit 11 to couple the acoustic signals into the signal waveguide 1. Instead it is also possible that the signal input coupler 4 triggers the evaluation unit 11 via an electric signal to define the temporal start of each coupling of an acoustic signal into the signal waveguide 1 for the evaluation to be done by the evaluation unit 11.
Instead of the preferred provision of a signal output coupler 6 at each of the two ends of the signal waveguide 1, only one signal output coupler 6 provided at one of the ends of the signal waveguide 1 may be used.
While the invention has been shown and described with reference to a preferred embodiment, it should be apparent to one of ordinary skill in the art that many changes and modifications may be made without departing from the spirit and scope of the invention as defined in the claims.
Claims (20)
1. An apparatus for detecting the position of an object moveable along a predetermined travel path, comprising:
an acoustic signal waveguide extending along the travel path and having a predetermined, uniform speed of propagation of sound;
a signal input coupler located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, at least one signal output coupler being arranged at one end of the acoustic signal waveguide and being connected to an evaluation unit for determining the propagation-time of the sound signal from a position at which it is coupled in to the at least one signal output coupler and for generating a signal representative of the instantaneous position of the moveable object on the travel path, wherein the signal input coupler couples in, as acoustic signal, adjacent pulses having a varying time interval.
an acoustic signal waveguide extending along the travel path and having a predetermined, uniform speed of propagation of sound;
a signal input coupler located on the moveable object, to couple a clocked acoustic signal into the acoustic signal waveguide, at least one signal output coupler being arranged at one end of the acoustic signal waveguide and being connected to an evaluation unit for determining the propagation-time of the sound signal from a position at which it is coupled in to the at least one signal output coupler and for generating a signal representative of the instantaneous position of the moveable object on the travel path, wherein the signal input coupler couples in, as acoustic signal, adjacent pulses having a varying time interval.
2. The apparatus of Claim 1, wherein the time interval fluctuates above and below by a constant amount from a mean value.
3. The apparatus of Claim 1, wherein the acoustic signal couples in synchronization pulses with a clock period which is greater than the propagation time of sound from one end of the travel path to the other, and a plurality of additional pulses located in between, whose time interval from one another varies.
4. The apparatus of Claim 3, wherein the synchronization pulses are marked with respect to the additional pulses.
5. The apparatus of Claim 4, wherein the clock of the synchronization pulses is offset in time with respect to that of the additional pulses.
6. The apparatus of Claim 3, wherein the synchronization pulses and the additional pulses are fed to the evaluation unit to determine the propagation-time difference.
7. The apparatus of Claim 1, wherein a counter connected with the signal output coupler is clocked by a clock generator.
8. The apparatus of claim 7, wherein at each end of the signal waveguide a signal output coupler is provided, each of which being connected to a counter, said counters being connected to a subtracter for the output signals from the two counters.
9. The apparatus of Claim 8, wherein the two counters are connected to a subtracter for the output signals from the two counters.
10. The apparatus of Claim 7, wherein the clock generator for the counter operates at a minimum frequency which is needed for an envisaged measurement path resolution.
11. The apparatus of Claim 1, wherein the signal output coupler is a piezoelectric output coupler.
12. The apparatus of Claim 1, wherein the signal output coupler is a capacitive output coupler.
13. The apparatus of Claim 1, wherein the signal output coupler is an inductive output coupler.
14. The apparatus of Claim 1, wherein the acoustic signal waveguide is a metallic body extending along the travel path.
15. The apparatus of Claim 14, wherein the acoustic signal waveguide is a metal rail.
16. The apparatus of Claim 14, wherein the acoustic signal waveguide is a wire.
17. The apparatus of Claim 1, wherein the signal input coupler is an inductive input coupler.
18. The apparatus of Claim 1, wherein the movable object is a lift cage.
19. An apparatus for detecting the position of an object which can be moved along a predetermined travel path, having an acoustic signal waveguide extending along the travel path and having a predetermined, uniform speed of propagation of sound, and having a signal input coupler, which is connected to a signal generator and is located on the movable object, for coupling a clocked acoustic signal into the acoustic signal waveguide, signal output couplers being arranged at both ends of the acoustic signal waveguide and being connected in each case to a counter, the two counters being connected to an evaluation unit for determining the propagation-time difference of the acoustic signal coupled in from the point at which it is coupled in to the signal output couplers and for generating a signal that is representative of the instantaneous position of the movable object on the travel path, wherein the signal input coupler couples in, as acoustic signal, adjacent pulses having a varying time interval.
20. The apparatus of Claim 19, wherein the evaluation unit includes a monitoring circuit which triggers an alarm signal if the difference determined by the subtracter exceeds a predetermined value.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19903645A DE19903645C2 (en) | 1999-01-29 | 1999-01-29 | Position detection device |
| DE19903645.4 | 1999-01-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2296472A1 CA2296472A1 (en) | 2000-07-29 |
| CA2296472C true CA2296472C (en) | 2005-07-12 |
Family
ID=7895846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002296472A Expired - Lifetime CA2296472C (en) | 1999-01-29 | 2000-01-20 | Device for detecting position |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1030189B1 (en) |
| JP (1) | JP3485852B2 (en) |
| CN (1) | CN1198148C (en) |
| AT (1) | ATE251758T1 (en) |
| BR (1) | BR0000217B1 (en) |
| CA (1) | CA2296472C (en) |
| DE (2) | DE19903645C2 (en) |
| ES (1) | ES2208157T3 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19929984C1 (en) * | 1999-06-30 | 2000-10-26 | Schmersal K A Gmbh & Co | Position detection device for elevator cabin uses evaluation of signal coupled to signal line extending along elevator shaft via periodically triggered signal coupler attached to elevator cabin |
| DE10129044C2 (en) * | 2001-06-15 | 2003-07-24 | Schmersal K A Gmbh & Co | Position detection device |
| US7204347B2 (en) | 2001-11-15 | 2007-04-17 | Otis Elevator Company | Arrhythmic pulse sequence for sonic distance measurement |
| DE10156043B4 (en) * | 2001-11-15 | 2006-03-02 | Otis Elevator Co., Farmington | Position-determining device |
| CN100357706C (en) * | 2005-07-01 | 2007-12-26 | 中国人民解放军国防科学技术大学 | Method for detecting position and speed of object moving along orbit |
| DE102009037347A1 (en) * | 2009-08-14 | 2011-02-17 | K.A. Schmersal Holding Gmbh & Co. Kg | Electronic security system for a lift |
| CN112061919B (en) * | 2020-08-31 | 2022-04-22 | 杭州临安森源电缆有限公司 | Method for testing timing counter of elevator |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE965203C (en) * | 1954-06-22 | 1957-06-06 | Siemens Ag | Method and device for recording pulse trains |
| NO130133B (en) * | 1969-05-28 | 1974-07-08 | Krupp Gmbh | |
| JPS58156872A (en) * | 1982-03-15 | 1983-09-17 | Kazuo Okada | Ultrasonic measuring device of distance |
| JPS60218087A (en) * | 1984-04-13 | 1985-10-31 | Komatsu Ltd | Detecting method of body using ultrasonic pulse |
| DE4203870C1 (en) * | 1992-02-11 | 1993-06-17 | Deutsche Aerospace Ag, 8000 Muenchen, De | Self detonating mine for destroying moving target - uses optical sensor with pulsed laser directed around circular measuring field with evaluation of reflected laser pulse |
| DE4426793C1 (en) * | 1994-07-28 | 1995-10-26 | Schmersal K A Gmbh & Co | Position measurement appts. for e.g. elevator or lift shaft |
-
1999
- 1999-01-29 DE DE19903645A patent/DE19903645C2/en not_active Expired - Fee Related
-
2000
- 2000-01-19 EP EP00100973A patent/EP1030189B1/en not_active Expired - Lifetime
- 2000-01-19 ES ES00100973T patent/ES2208157T3/en not_active Expired - Lifetime
- 2000-01-19 DE DE50003956T patent/DE50003956D1/en not_active Expired - Lifetime
- 2000-01-19 AT AT00100973T patent/ATE251758T1/en not_active IP Right Cessation
- 2000-01-20 JP JP2000011365A patent/JP3485852B2/en not_active Expired - Lifetime
- 2000-01-20 CA CA002296472A patent/CA2296472C/en not_active Expired - Lifetime
- 2000-01-27 CN CNB001016830A patent/CN1198148C/en not_active Expired - Lifetime
- 2000-01-28 BR BRPI0000217-8A patent/BR0000217B1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| DE19903645C2 (en) | 2002-07-18 |
| DE19903645A1 (en) | 2000-08-31 |
| EP1030189A1 (en) | 2000-08-23 |
| ES2208157T3 (en) | 2004-06-16 |
| DE50003956D1 (en) | 2003-11-13 |
| JP2000221257A (en) | 2000-08-11 |
| CN1198148C (en) | 2005-04-20 |
| BR0000217B1 (en) | 2014-07-15 |
| CN1264046A (en) | 2000-08-23 |
| EP1030189B1 (en) | 2003-10-08 |
| BR0000217A (en) | 2000-09-26 |
| CA2296472A1 (en) | 2000-07-29 |
| JP3485852B2 (en) | 2004-01-13 |
| ATE251758T1 (en) | 2003-10-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2296656C (en) | Device for detecting position | |
| US5736695A (en) | Device for detecting position | |
| JPH02231532A (en) | Filling condition measuring apparatus | |
| WO1994002804A1 (en) | Rejecting noise in magnetostrictive position detector by determining valid time range for propagation of reference sonic pulses | |
| CA2296472C (en) | Device for detecting position | |
| US6366532B1 (en) | Apparatus for detecting position | |
| EP0218293B1 (en) | A method and an apparatus for determining the velocity, direction and other magnitudes of a flow, in particular a gas flow | |
| NL8002888A (en) | SYSTEM FOR MEASURING THE WALL THICKNESS OF A MEASURING OBJECT. | |
| US6570817B2 (en) | Apparatus for detecting position | |
| CA2296455A1 (en) | Device for detecting position | |
| JP4399264B2 (en) | Irregular pulse sequence for acoustic distance measurement | |
| US7204347B2 (en) | Arrhythmic pulse sequence for sonic distance measurement | |
| JPH05134032A (en) | Method and circuit apparatus for identifying signal accompanying noise | |
| ITRM960504A1 (en) | WHEEL DETECTOR TO INDICATE THE PRESENCE OF A VEHICLE ON SPACED RAILS | |
| EP0300782B1 (en) | Coin discriminator | |
| JP2510393Y2 (en) | Ultrasonic flaw detector | |
| JPH08271628A (en) | Ultrasonic distance measuring system | |
| JPS5853283B2 (en) | Position detection method of moving object and its device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20200120 |