IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0524904
(2008-01-28)
|
등록번호 |
US-8405821
(2013-03-26)
|
우선권정보 |
DE-10 2007 005 187 (2007-01-29) |
국제출원번호 |
PCT/EP2008/000615
(2008-01-28)
|
§371/§102 date |
20100319
(20100319)
|
국제공개번호 |
WO2008/092611
(2008-08-07)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
3 인용 특허 :
12 |
초록
▼
The invention relates to a method and a device for determining a modification at one object or a modification caused by an object (1.26), wherein a measurement of the light propagation time is also possible. According to the invention, an amplitude control (1.6) regulates a transmitter light source
The invention relates to a method and a device for determining a modification at one object or a modification caused by an object (1.26), wherein a measurement of the light propagation time is also possible. According to the invention, an amplitude control (1.6) regulates a transmitter light source (1.8) and a reference light source (1.9) on the basis of a control value (1.29) in such a way that the signals from the corresponding associated light paths have approximatively the same value at the input of a comparator (1.19). As a result, an alternative detection of extraneous light is possible. In addition, a phase regulation for measuring the light propagation time can be provided.
대표청구항
▼
1. Method for determining a distance to a retroreflective object, the method including the following steps: transmitting a transmitted signal clocked by a clock control from at least one transmitting light source into at least one light path via an object to at least one receiver to detect a change
1. Method for determining a distance to a retroreflective object, the method including the following steps: transmitting a transmitted signal clocked by a clock control from at least one transmitting light source into at least one light path via an object to at least one receiver to detect a change in the transmitted signal from the object,receiving the transmitted signal from the light path by the at least one receiver as a first received signal and converting the first received signal into an electrical signal,transmitting at least one reference signal clocked by the clock control from at least one reference light source into at least one further light path to the at least one receiver,receiving the at least one reference signal from the at least one further light path by the at least one receiver as a second received signal and converting the second received signal into at least one electrical reference signal,evaluating the electrical signal and the at least one electrical reference signal in at least one comparator to determine a distance to the object,comparing one electrical signal integrated over at least a sub-section of the transmitted signal with the at least one electric reference signal, which is adjacent in time to the transmitted signal and integrated over at least one sub-section,generating a control value at an output of the at least one comparator to regulate the amplitude values of at least one of the transmitted signal and the at least one reference signal, wherein an amplitude of the electrical signal and an amplitude of the at least one electrical reference signal are equal in magnitude at least at the inputs of the at least one comparator when in a stabilized state,determining in the stabilized state an amplitude of a clock pulse change signal, occurring during a clock pulse change between at least one of the groups of the first electrical signal and the at least one electrical reference signal or the at least one electrical reference signal and the first electrical signal, the clock pulse change signal corresponding to a light transit time from the at least one transmitting light source to the object and to the at least one receiver,determining the amplitude of the clock pulse change signals in relation to one another or the amplitude of the clock pulse change signal compared to an amplitude independent of the light transit time as a difference value in a further comparator and eliminating or at least minimizing the difference value by means of a regulator, andwherein the at least one electrical reference signal at the input of the at least one comparator is formed by a mean value of the electrical reference signals of at least two reference signals in pulse form, of which one is emitted before and one is emitted after the transmitted signal in pulse form. 2. Method according to claim 1, wherein the amplitude value independent of this light transit time is an amplitude value at a preamplifier when the electrical signal and the at least one electrical reference signal at the inputs of the comparator are equal in magnitude. 3. Method according to claim 1, wherein the difference value is changed by means of the regulator to regulate the phase of the transmitted signal and the at least one reference signal until the difference value is minimal, wherein an adjusted change in the case of a minimal difference value corresponds to the light transit time. 4. Method according to claim 1, wherein if the electrical signal and the at least one electrical reference signal at the inputs of the comparator are equal in magnitude, only amplifier noise without clock synchronous alternating components from at least one the at least one transmitting light source and reference light source is present at the output of the at least one comparator. 5. Method according to claim 1, wherein to compensate different reaction times between the transmitting light source and the reference light source the sections, which contain no clock pulse change signal, are compared with further sections, which contain the clock pulse change signal, in an additional comparator, and wherein in the case of a difference at an output of the additional comparator at least one of the transmitted signal and an additional reference signal are lengthened or shortened until the difference is eliminated. 6. Method according claim 1, wherein for a digital signal delay a number of gates tappable by switches are provided, wherein a switch is selected in dependence on the difference value. 7. Method according to claim 6, wherein the clock control generates a clock pulse, and after passing through all the gates, which corresponds to a time of at least a half or a whole clock pulse period, a clock pulse is compared with an input clock pulse in a phase comparator to identify a phase difference, wherein any phase difference present regulates a delay time of the gates by means of a supply voltage of the gate. 8. Device for determining a distance to a retroreflective object, the device comprising: a clock control, at least one transmitting light source for transmitting a transmitted signal clocked by the clock control into at least one light path via an object to at least one receiver to determine a change in the transmitted signal; at least one reference light source configured to transmit at least one reference signal clocked by the clock control into at least one further light path to the at least one receiver;the at least one receiver configured to receive the transmitted signal and the at least one reference signal and for converting a received signal from the transmitted signal at the receiver into an electrical signal and a received signal from the at least one reference signal at the receiver into at least one electrical reference signal;at least one comparator configured to compare the electrical signal and the at least one electrical reference signal to generate a comparative value at an output of the at least one comparator;an evaluation unit configured to evaluate the comparative value to determine a distance to the object;a control unit configured to control the clock control and signal path switches to integrate the electrical signal disposed over at least one sub-section of the transmitted signal and to integrate the at least one electrical reference signal, over at least one sub-section of the at least one electrical reference signal, said electrical reference signal being adjacent in time to the transmitted signal;at least one regulator adapted to regulate the amplitude values of the at least one transmitted signal and the at least one electrical reference signal wherein an amplitude of the electrical signal and an amplitude of the at least one electrical reference signal are equal in magnitude at least at inputs of the at least one comparator;means for detecting an amplitude of at least one clock pulse change signal in a stabilized state, wherein at least one clock pulse change signal occurs during a clock pulse change between at least one of the groups of the electrical signal and the at least one electrical reference signal or the electrical reference signal and the at least one electrical signal, the at least one clock pulse change signal corresponding to a light transit time from the transmitting light source to the object and to the receiver;a second comparator configured to determine a difference value between the amplitudes of clock pulse change signals in relation to one another or the amplitude of the clock pulse change signal compared to an amplitude value independent of the light transit time; a regulator configured to eliminate or at least minimize the difference value; and wherein a mean value former is provided to form a mean value of the at least one electrical reference signal resulting from at least two reference signals in pulse form at an input of the comparator, of which one reference signal is emitted before and another reference signal is emitted after the transmitted signal in pulse form. 9. Device according to claim 8, wherein the amplitude value independent of this light transit time is an amplitude value at a preamplifier when the electrical signal and the at least one electrical reference signal at the inputs of the comparator are equal in magnitude. 10. Device according to claim 8, wherein the regulator is provided to regulate a phase of the transmitted signal and the reference signal by influencing and minimizing the difference value, wherein the delay adjusted in the case of a minimal difference value corresponds to the light transit time. 11. Device according to claim 8, wherein an additional comparator is provided to compensate different reaction times between the transmitting light source and the at least one reference light source, which additional comparator compares sections, which contain no clock pulse change signal, with sections, which contain a clock pulse change signal, and wherein a regulator is provided, which lengthens or shortens at least one of the transmitted signal or the reference signal in the case of a difference at an output of the additional comparator until the difference is eliminated. 12. Device according to claim 8, wherein for a digital signal delay a number of gates tappable by means of switches are provided, wherein a switch is selected in dependence on the difference value. 13. Device according to claim 12, wherein a phase comparator is provided, which compares an input clock pulse of the clock control with a clock pulse, which is present after passing through all the gates and corresponds to a time of at least a half or a whole clock pulse period, to determine a phase difference, and wherein a regulator is provided, which if any phase difference is present regulates a delay time of the gates by means of a supply voltage of the gate. 14. Method for determining a distance to a retroreflective object, the method including the following steps: transmitting a transmitted signal clocked by a clock control from at least one transmitting light source into at least one light path via an object to at least one receiver to detect a change in the transmitted signal from the object,receiving the transmitted signal from the at least one light path by the at least one receiver as a first received signal and converting the first received signal into an electrical signal,forwarding at least one electrical reference signal clocked by the clock control,evaluating the electrical signal and the at least one electrical reference signal in at least one comparator to determine a distance to the object, wherein the electrical signal integrated over at least a sub-section of the transmitted signal is compared with the at least one electric reference signal, which is adjacent in time to the transmitted signal and integrated over at least one sub-section of the transmitted signal,generating a control value at an output of the at least one comparator to regulate amplitude values of at least one of the transmitted signal and the at least one electrical reference signal, wherein an amplitude of the electrical signal and an amplitude of the at least one electrical reference signal are equal in magnitude at least at inputs of the at least one comparator when in a stabilized state,determining in the stabilized state an amplitude of a clock pulse change signal, occurring during a clock pulse change between at least one of the groups of the electrical signal and the at least one electrical reference signal or the at least one electrical reference signal and the electrical signal, the clock pulse change signal corresponds to a light transit time from the at least one transmitting light source to the object and to the at least one receiver,determining the amplitude of clock pulse change signals in relation to one another or the amplitude of the clock pulse change signal compared to an amplitude independent of the light transit time as difference value in a further comparator and eliminating or at least minimizing the difference value by means of a regulator, andwherein the at least one electrical reference signal at the input of the at least one comparator is formed by a mean value of electrical reference signals of at least two reference signals in pulse form, of which one is emitted before and one is emitted after the transmitted signal in pulse form. 15. Method according to claim 14, wherein the amplitude value independent of this light transit time is an amplitude value at a preamplifier when the electrical signal and the at least one electrical reference signal at the inputs of the at least one comparator are equal in magnitude. 16. Method according to claim 14, wherein the difference value is changed by means of the regulator to regulate the phase of the transmitted signal and the at least one reference signal until the difference value is minimal, wherein an adjusted change corresponds to the light transit time. 17. Method according to claim 14, wherein to compensate different reaction times, between the transmitting light source and reference source, sections, which contain no clock pulse change signal, are compared with further sections, which contain the clock pulse change signal, in an additional comparator, and wherein in the case of a difference at an output of the additional comparator at least one of the transmitted signal and the electrical reference signal forwarded are lengthened or shortened until the difference is eliminated. 18. Method according to claim 14, wherein for a digital signal delay a number of gates tappable by switches are provided, wherein a switch is selected in dependence on the difference value. 19. Method according to claim 18, wherein the clock control generates a clock pulse, and after passing through all the gates, which corresponds to a time of at least a half or a whole clock pulse period, the clock pulse is compared with the input clock pulse in a phase comparator to identify a phase difference, wherein any phase difference present regulates a delay time of the gates by means of a supply voltage of the gate. 20. Device for determining a distance to a retroreflective object, the device comprising: a clock control,at least one transmitting light source configured to transmit a transmitted signal clocked by the clock control into at least one light path via the object to at least one receiver to determine the change in the transmitted signal;the at least one receiver configured to receive the transmitted signal and configured to convert the transmitted signal into an electrical signal;a reference path configured to forward an electrical reference signal clocked by the clock control;at least one comparator configured to compare the electrical signal and the at least one electrical reference signal to generate a comparative value at an output of the comparator;an evaluation unit configured to evaluate the comparative value to determine a distance to the object;a control unit configured to control the clock control and signal path switches to integrate the electrical signal disposed over at least one subsection of the transmitted signal and to integrate the at least one electrical reference signal, integrated over at least one sub-section of the electrical reference signal, said electrical reference signal being adjacent in time to the transmitted signal;at least one regulator adapted to regulate amplitude values of at least one of the electrical signal and the at least one electrical reference signal so that an amplitude of the electrical signal and an amplitude of the at least one electrical reference signal are equal in magnitude at least at inputs of the at least one comparator;means for detecting an amplitude of at least one clock pulse change signal in the stabilized state, wherein at least one clock pulse change signal occurs during a clock pulse change between at least one of the groups of the electrical signal and the at least one electrical reference signal or the at least one electrical reference signal and the electrical signal, the at least one clock pulse change signal corresponding to the light transit time from the transmitting light source to the object and to the receiver;a second comparator configured to determine a difference value between the amplitudes of clock pulse change signals in relation to one another or the amplitude of the clock pulse change signal compared to an amplitude value independent of the light transit time;a regulator configured to eliminate or at least minimizes the difference value; andwherein a mean value form is provided to form a mean value of the at least one electrical reference signals resulting form at least two reference signals in pulse form at an input of the comparator, of which a one reference signal is emitted before and another reference signal is emitted after the transmitted signal in pulse form. 21. Device according to claim 20, wherein the amplitude value independent of this light transit time is an amplitude value at a preamplifier when the electrical signal and the at least one electrical reference signal at the inputs of the comparator are equal in magnitude. 22. Device according to claim 20, wherein the regulator is provided to regulate a phase of the transmitted signal and the reference signal by influencing and minimizing the difference value, wherein the delay adjusted in the case of a minimal difference value corresponds to the light transit time. 23. Device according to claim 20, wherein an additional comparator is provided to compensate different reaction times between the transmitting light source and at least one reference source, which additional comparator compares sections, which contain no clock pulse change signal, with sections, which contain a clock pulse change signal, and wherein a regulator is provided, which lengthens or shortens at least one of the transmitted signal and the electrical reference signal forwarded, in the case of a difference at an output of the additional comparator until the difference is eliminated. 24. Device according claim 20, wherein for a digital signal delay a number of gates tappable by means of switches are provided, wherein a switch is selected in dependence on the difference value. 25. Device according to claim 24, wherein a phase comparator is provided, which compares an input clock pulse of the clock control with the clock pulse, which is present after passing through all the gates and corresponds to a time of at least a half or a whole clock pulse period, to determine a phase difference, and wherein a regulator is provided, which if any phase difference is present regulates the delay time of the gates by means of a supply voltage of the gate.
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