DISTANCE MEASURING DEVICE
First Claim
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1. A distance measuring, device which intermittently emits light to a measured object and measures a distance to the measured object based on time from the emission of the light until scattered light of the light scattered on the measured object is detected, the device comprising:
- an optical detector to detect the scattered light; and
a measurer having a sampler to sample a signal corresponding to an output signal of the optical detector every time when the light is emitted at a plurality of sampling time points, the plurality of sampling time points being segmented into at least first and second segments, and a storage to store a value obtained by accumulating sampling values at each sampling time point, to measure the distance based on a plurality of first accumulation values at the sampling time points in the first segment and initialize the first accumulation value every time when a first ending condition is satisfied, and to measure the distance based on a plurality of second accumulation values at the sampling time points in the second distance segment and initialize the second accumulation value every time when a second ending condition is satisfied.
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Abstract
According to an embodiment, a distance measuring device measures a distance to the measured object base on light scattered on the measured object is detected. The distance measuring device includes an optical detector and a measurer. The optical detector detects the scattered light. The measurer has a sampler to sample a signal corresponding to an output signal of the optical detector every time when the light is emitted at a plurality of sampling time points and a storage to accumulate sampling values and store an accumulation value at each sampling time point. The measurer measures the distance based on a plurality of accumulation values at the sampling time points.
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Citations
16 Claims
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1. A distance measuring, device which intermittently emits light to a measured object and measures a distance to the measured object based on time from the emission of the light until scattered light of the light scattered on the measured object is detected, the device comprising:
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an optical detector to detect the scattered light; and a measurer having a sampler to sample a signal corresponding to an output signal of the optical detector every time when the light is emitted at a plurality of sampling time points, the plurality of sampling time points being segmented into at least first and second segments, and a storage to store a value obtained by accumulating sampling values at each sampling time point, to measure the distance based on a plurality of first accumulation values at the sampling time points in the first segment and initialize the first accumulation value every time when a first ending condition is satisfied, and to measure the distance based on a plurality of second accumulation values at the sampling time points in the second distance segment and initialize the second accumulation value every time when a second ending condition is satisfied. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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2. A distance measuring device which intermittently emits light to a measured object and measures a distance to the measured object based on time from the emission of the light until scattered light of the light scattered on the measured object is detected, the device comprising:
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an optical detector to detect the scattered light; and an analog-digital converter which samples signals at plural sampling timing every time when the light is emitted to the photo detector; and a memory which stores the cumulate value where the sampling value is cumulated at every sampling time; and a digital processing filter which has a feature that it measures the time and the height of peak by interpolation that estimates the peak of waveform consisting of the cumulate value.
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11. The distance measuring device which emit light intermittently and measures distance based on the time between the time when the light is emitted and the time when the light which is scattered on the measured object is detected, the device comprising:
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an optical detector to detect the scattered light; a light source to intermittently emit first light and to emit second light weaker than the first light at least once during two emissions of at least part of the first light; an optical mechanism system to scan the first light and the second light on the surface of the measured object and to inject the first light and the second light scattered on the measured object into the optical detector ; and a measurer to measure a distance to each position on the measured object based on a detection result of the optical detector. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification
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Current AssigneeKabushiki Kaisha Toshiba (Toshiba Corporation)
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Original AssigneeKabushiki Kaisha Toshiba (Toshiba Corporation)
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InventorsKubota, Hiroshi, FUKUSHIMA, Tomonori, Matsumoto, Nobu
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current
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CPC Class CodesG01S 17/10 using transmission of inter...G01S 17/42 Simultaneous measurement of...G01S 7/4865 Time delay measurement, e.g...G01S 7/487 Extracting wanted echo sign...
