Apparatus and method for measuring a periodic signal
First Claim
1. A device for measuring a periodic signal comprising:
- a first control unit for generating an electrical input signal of the period T;
a light source for generating an optical input signal directed to an object being measured from the electrical input signal;
an optical receiver for detecting and converting the signal reflected from the object being measured, said signal corresponding to the optical input signal altered in terms of phase and amplitude, into an electrical measurement signal; and
a plurality of measurement channels connected in parallel between the optical receiver and a second control unit, each measurement channel being connected in series to a switching element, a filter element, and an analog-to-digital converter, the second control unit being suitable for evaluating the measurement signals from the plurality of measurement channels;
whereinthe electrical measurement signal is applied to each of the plurality of measurement channels, the same frequency of the electrical measurement signal being processed in each of the plurality of measurement channels;
the first control unit is connected to the plurality of switching elements and is suitable for actuating the switching elements for different time intervals in each case; and
the analog-to-digital converters comprise a maximum sampling rate of less than 2×
1/T.
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Accused Products
Abstract
A device for measuring a periodic signal includes: a first control unit for generating an electrical input signal (V1) of the period T; a light source for generating an optical input signal directed to an object being measured from the electrical input signal (V1); an optical receiver for detecting and converting the signal reflected from the object being measured, the signal corresponding to the optical input signal altered in terms of phase and amplitude, into an electrical measurement signal (V2); and a plurality of measurement channels connected in parallel between the optical receiver and a second control unit, each measurement channel being connected in series to a switching element, a filter element, and an analog-to-digital converter, wherein the second control unit is suitable for evaluating the measurement signals from the plurality of measurement channels, and in which the electrical measurement signal (V2) is applied to each of the plurality of measurement channels, the first control unit is connected to the plurality of switching elements and is suitable for actuating the switching elements for different time intervals in each case, and the analog-to-digital converters have a maximum sampling rate of less than 2×1/T.
13 Citations
14 Claims
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1. A device for measuring a periodic signal comprising:
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a first control unit for generating an electrical input signal of the period T; a light source for generating an optical input signal directed to an object being measured from the electrical input signal; an optical receiver for detecting and converting the signal reflected from the object being measured, said signal corresponding to the optical input signal altered in terms of phase and amplitude, into an electrical measurement signal; and a plurality of measurement channels connected in parallel between the optical receiver and a second control unit, each measurement channel being connected in series to a switching element, a filter element, and an analog-to-digital converter, the second control unit being suitable for evaluating the measurement signals from the plurality of measurement channels; wherein the electrical measurement signal is applied to each of the plurality of measurement channels, the same frequency of the electrical measurement signal being processed in each of the plurality of measurement channels; the first control unit is connected to the plurality of switching elements and is suitable for actuating the switching elements for different time intervals in each case; and the analog-to-digital converters comprise a maximum sampling rate of less than 2×
1/T.- View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for measuring a periodic measurement signal, the method comprising the following steps:
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sending to an object being measured an optical input signal from a light source based on an electrical input signal with the period T; receiving and converting an optical measurement signal corresponding to the optical input signal altered in terms of phase and amplitude into an electrical measurement signal in an optical receiver; and tapping the electrical measurement signal by each of a plurality of parallel-connected measurement channels, each of which is connected in series with a switching element, a low-pass filter, and an analog-to-digital converter; and
whereinthe same frequency of the electrical measurement signal is processed in each of the plurality of measurement channels; the electrical measurement signal is tapped by each of the plurality of measurement channels at periodically recurring time intervals, different in each channel, wherein a first control unit actuates the switching elements in each of the plurality of measurement channels; and the electrical measurement signal of each time interval in each of the plurality of measurements channels is integrated in the low-pass filter, converted in the analog-to-digital converter, and evaluated in a second control unit. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification