Abstracts of Papers Accepted for the Symposium but not Presented: An Automatic Snow-Depth Meter using Infrared Beam Reflection from a Snow Surface for the Measurement of the Snow Depth on the Road
Abstract In order to measure the snow depth on a road, a new type of snow-depth meter based on trigonometry with an infrared beam source, beam reflection points on the snow surface and a detector of the reflected beam, was developed using a gallium-arsenide infrared-emission diode and a silicon infr...
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Cambridge University Press (CUP)
1977
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Online Access: | http://dx.doi.org/10.1017/s0022143000029646 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000029646 |
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crcambridgeupr:10.1017/s0022143000029646 2024-03-03T08:45:57+00:00 Abstracts of Papers Accepted for the Symposium but not Presented: An Automatic Snow-Depth Meter using Infrared Beam Reflection from a Snow Surface for the Measurement of the Snow Depth on the Road Kimura, Tadashi 1977 http://dx.doi.org/10.1017/s0022143000029646 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000029646 en eng Cambridge University Press (CUP) Journal of Glaciology volume 19, issue 81, page 677 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1977 crcambridgeupr https://doi.org/10.1017/s0022143000029646 2024-02-08T08:40:37Z Abstract In order to measure the snow depth on a road, a new type of snow-depth meter based on trigonometry with an infrared beam source, beam reflection points on the snow surface and a detector of the reflected beam, was developed using a gallium-arsenide infrared-emission diode and a silicon infrared-detection dual diode. The prototype of this meter operated successfully from 1 February to 31 March 1975 at Nagaoka, Japan. In the prototype, an infrared beam source, with 10 mW output power, and a detector were fixed 4 m above the ground facing each other at a distance of 5 m. These two photoelectric elements were set in small light-weight cases. Each has a small window (4 cm × 10 cm) to emit or receive the infrared beam. To avoid catching snow or rain in the windows, air was ejected through them. The visual field of the detector was 4.8° and the dip angle of its centre line was fixed at 45°. On the other hand the beam source emitted with 1.4° divergence and varied its dip angle from 90° to 20° with a period of 4 min in the vertical plane which contains the centre line of the visual field of the detector. This beam was reflected by the snow surface and received by the detector in its visual field. When the detection system of the meter detected the beam centre, the dip angle of the scanning beam was measured by a potentiometer connected mechanically to the infrared source scanner. Output voltages of the potentiometer indicated the measurement of snow depth within an accuracy of ±5 mm for the flat plate or snow surface from 0 to 1.5 m above the ground. In addition, a phase-sensitive detection circuit with equivalent band-width of 0.4 Hz and driven by a synchronous signal of 1 kHz from the modulation circuit of the beam source was adopted in order to eliminate noise such as occurs due to sunshine, heavy snow-storms or traffic. As a result very reliable movements were obtained under conditions of heavy snowstorms with horizontal visibility less than 30 m at eye level in daytime. Article in Journal/Newspaper Journal of Glaciology Cambridge University Press Journal of Glaciology 19 81 677 |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Kimura, Tadashi Abstracts of Papers Accepted for the Symposium but not Presented: An Automatic Snow-Depth Meter using Infrared Beam Reflection from a Snow Surface for the Measurement of the Snow Depth on the Road |
topic_facet |
Earth-Surface Processes |
description |
Abstract In order to measure the snow depth on a road, a new type of snow-depth meter based on trigonometry with an infrared beam source, beam reflection points on the snow surface and a detector of the reflected beam, was developed using a gallium-arsenide infrared-emission diode and a silicon infrared-detection dual diode. The prototype of this meter operated successfully from 1 February to 31 March 1975 at Nagaoka, Japan. In the prototype, an infrared beam source, with 10 mW output power, and a detector were fixed 4 m above the ground facing each other at a distance of 5 m. These two photoelectric elements were set in small light-weight cases. Each has a small window (4 cm × 10 cm) to emit or receive the infrared beam. To avoid catching snow or rain in the windows, air was ejected through them. The visual field of the detector was 4.8° and the dip angle of its centre line was fixed at 45°. On the other hand the beam source emitted with 1.4° divergence and varied its dip angle from 90° to 20° with a period of 4 min in the vertical plane which contains the centre line of the visual field of the detector. This beam was reflected by the snow surface and received by the detector in its visual field. When the detection system of the meter detected the beam centre, the dip angle of the scanning beam was measured by a potentiometer connected mechanically to the infrared source scanner. Output voltages of the potentiometer indicated the measurement of snow depth within an accuracy of ±5 mm for the flat plate or snow surface from 0 to 1.5 m above the ground. In addition, a phase-sensitive detection circuit with equivalent band-width of 0.4 Hz and driven by a synchronous signal of 1 kHz from the modulation circuit of the beam source was adopted in order to eliminate noise such as occurs due to sunshine, heavy snow-storms or traffic. As a result very reliable movements were obtained under conditions of heavy snowstorms with horizontal visibility less than 30 m at eye level in daytime. |
format |
Article in Journal/Newspaper |
author |
Kimura, Tadashi |
author_facet |
Kimura, Tadashi |
author_sort |
Kimura, Tadashi |
title |
Abstracts of Papers Accepted for the Symposium but not Presented: An Automatic Snow-Depth Meter using Infrared Beam Reflection from a Snow Surface for the Measurement of the Snow Depth on the Road |
title_short |
Abstracts of Papers Accepted for the Symposium but not Presented: An Automatic Snow-Depth Meter using Infrared Beam Reflection from a Snow Surface for the Measurement of the Snow Depth on the Road |
title_full |
Abstracts of Papers Accepted for the Symposium but not Presented: An Automatic Snow-Depth Meter using Infrared Beam Reflection from a Snow Surface for the Measurement of the Snow Depth on the Road |
title_fullStr |
Abstracts of Papers Accepted for the Symposium but not Presented: An Automatic Snow-Depth Meter using Infrared Beam Reflection from a Snow Surface for the Measurement of the Snow Depth on the Road |
title_full_unstemmed |
Abstracts of Papers Accepted for the Symposium but not Presented: An Automatic Snow-Depth Meter using Infrared Beam Reflection from a Snow Surface for the Measurement of the Snow Depth on the Road |
title_sort |
abstracts of papers accepted for the symposium but not presented: an automatic snow-depth meter using infrared beam reflection from a snow surface for the measurement of the snow depth on the road |
publisher |
Cambridge University Press (CUP) |
publishDate |
1977 |
url |
http://dx.doi.org/10.1017/s0022143000029646 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000029646 |
genre |
Journal of Glaciology |
genre_facet |
Journal of Glaciology |
op_source |
Journal of Glaciology volume 19, issue 81, page 677 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000029646 |
container_title |
Journal of Glaciology |
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19 |
container_issue |
81 |
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677 |
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1792501669742772224 |