Design and Operation of the Ceilometer Computer (Classic Reprint) - Softcover

Meissner, Paul

Softcover

ISBN 10: 1527855066 ISBN 13: 9781527855069

Publisher: Forgotten Books, 2018

Synopsis

Excerpt from Design and Operation of the Ceilometer Computer

The ceilometer computer has been designed to provide a numerical display of cloud height information, utilizing data received from a rotating beam ceilometer. The computer has been developed to fulfill a requirement of the U. 8. Weather Bureau in connection with the establishment of automatic weather stat ions. The output of the computer can be transmitted by teletype. Together with the outputs from a variety of other weather-indicating instruments.

The rotating beam ceilometer is a device which measures the height of clouds from the ground up to about 10, 000 feet.

A light beam from a rotating searchlight is reflected by the clouds and is received by a photocell placed at a known horizontal distance from the searchlight. As shown in Fig. 1. The cloud height is calculated by simple triangulation, using the angle at which the cloud signal is received and the length of the baseline. The light source is modulated by means of a rotating shutter, and the photo cell operates in conjunction with a filter and a tuned amplifier to discriminate against ambient light. The present ceilometer provides 10 scans per minute.

At present the ceilometer indications are observed by an operator who interprets a cathode -ray display and obtains answers to a variety of questions. Typical questions might be the following: At what height did most of the clouds occur over the past ten minutes (or one minute What was the lowest level at which a significant number of clouds occurred? The highest level? How many clouds occurred below a certain critical level?

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Edition details

• Publisher: Forgotten Books
• Publication date: 2018
• Language: English
• ISBN 10: 1527855066
• ISBN 13: 9781527855069
• Binding: Paperback
• Number of pages: 85