Determination of a physical state of an optical device
First Claim
1. A method of determining a physical state of an optical device with the steps of:
- coupling a first optical signal to the optical device, wherein a first optical property of said first optical signal is varied according to a first function over the time, measuring a second optical property over the time of a first response signal returning from the optical device in response to the first optical signal and establishing a first result function of said second optical property in dependence of the first optical property of the first optical signal, coupling a second optical signal to the optical device, wherein the first optical property of said second optical signal is varied according to a second function of the time that is different from the first function over the time, measuring the second optical property over the time of a second response signal returning from the optical device in response to the second optical signal and establishing a second result function of said second optical property in dependence of the first optical property of the second optical signal, and determining the physical state based on a combination of the first and the second result functions.
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Abstract
The present invention relates to a determination of a physical state of an optical device by measuring a response signal. At least two subsequent measurements are executed. Therefore, a first optical signal is transmitted to the optical device, wherein a first optical property of said first signal is varied according to a first function of the time. A second optical property of a first response signal returning from the optical device is measured over the time and a first result function of the second optical property of the first response signal over the first optical property of first optical signal is established. Further, a second optical signal is transmitted to the optical device, wherein the first optical property of said signal is varied according to a second function of the time that is different from the first function of time. The second optical property of the corresponding second response signal is measured and a second result function of the second optical property of the response signal over the first optical property of the transmitted optical signal is established. The physical state of the optical device is determined on the base of a combination of the first and second result functions.
12 Citations
16 Claims
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1. A method of determining a physical state of an optical device with the steps of:
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coupling a first optical signal to the optical device, wherein a first optical property of said first optical signal is varied according to a first function over the time, measuring a second optical property over the time of a first response signal returning from the optical device in response to the first optical signal and establishing a first result function of said second optical property in dependence of the first optical property of the first optical signal, coupling a second optical signal to the optical device, wherein the first optical property of said second optical signal is varied according to a second function of the time that is different from the first function over the time, measuring the second optical property over the time of a second response signal returning from the optical device in response to the second optical signal and establishing a second result function of said second optical property in dependence of the first optical property of the second optical signal, and determining the physical state based on a combination of the first and the second result functions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A evaluation unit for determining an optical state of an optical device, comprising
a first input adapted for receiving first optical property information about each a first and a second optical signal coupled to a optical device, a second input adapted for receiving second optical property information about each a correspondingly first and a second returned optical signals from the optical device, a processing unit adapted for relating the first and the second information for each the first and the second measurement and further adapted for determining the physical state based on a combination of the first and the second result functions.
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16. A software program or product, preferably stored on a data carrier, for executing in an evaluation unit the following steps, when run on a data processing system such as a computer:
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receiving first information about a first optical property of at least two emitted optical signals, receiving second information about a second optical property of two detected corresponding signals returned from an optical device, relating the first and the second information to each other into each a function for each of the optical signals and determining a resulting center value on the base of the first and the second result functions.
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Specification