ASTM D5527-23

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
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of the standard as published by ASTM is to be considered the official document.
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Designation: D5527 − 00 (Reapproved 2017) D5527 − 23
Standard Practices for
Measuring Surface Wind and Temperature by Acoustic
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Means
This standard is issued under the fixed designation D5527; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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ε NOTE—Warning notes were editorially updated throughout in March 2017.
1. Scope
1.1 These practices cover procedures for measuring one-, two-, or three-dimensional vector wind components and sonic
temperature by means of commercially available sonic anemometer/thermometers that employ the inverse time measurement
technique. These practices apply to the measurement of wind velocity components over horizontal terrain using instruments
mounted on stationary towers. These practices also apply to speed of sound measurements that are converted to sonic temperatures
but do not apply to the measurement of temperature by the use of using ancillary temperature devices.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
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2.1 ASTM Standards:
D1356 Terminology Relating to Sampling and Analysis of Atmospheres
D3631 Test Methods for Measuring Surface Atmospheric Pressure
D4230 Test Method for Measuring Humidity with Cooled-Surface Condensation (Dew-Point) Hygrometer
E337 Test Method for Measuring Humidity with a Psychrometer (the Measurement of Wet- and Dry-Bulb Temperatures)
IEEE/ASTM SI-10 American National Standard for Use of the International System of Units (SI): The Modern Metric System
3. Terminology
3.1 Definitions—Refer to Terminology D1356 for common terminology.
3.2 Definitions of Terms Specific to This Standard:
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These practices are under the jurisdiction of ASTM Committee D22 on Air Quality and are the direct responsibility of Subcommittee D22.11 on Meteorology.
Current edition approved March 1, 2017Sept. 1, 2023. Published March 2017September 2023. Originally approved in 1994. Last previous edition approved in 20112017
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as D5527 – 00 (2011).(2017) . DOI: 10.1520/D5527-00R17E01.10.1520/D5527-23.
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D5527 − 23
3.2.1 acceptance angle (6α, deg)—deg), n—the angular distance, centered on the array axis of symmetry, over which the
following conditions are met: (a) wind components are unambiguously defined, and (b) flow across the transducers is unobstructed
or remains within the angular range for which transducer shadow corrections are defined.
3.2.2 acoustic pathlength (d, (m))—(m)), n—the distance between transducer transmitter-receiver pairs.
3.2.3 sampling period(s)—period(s), n—the record length or time interval over which data collection occurs.
3.2.4 sampling rate (Hz)—(Hz), n—the rate at which data collection occurs, usually presented in samples per second or Hertz.
3.2.5 sonic anemometer/thermometer—anemometer/thermometer, n—an instrument consisting of a transducer array containing
paired sets of acoustic transmitters and receivers, a system clock, and microprocessor circuitry to measure intervals of time
between transmission and reception of sound pulses.
3.2.5.1 Discussion—
The fundamental measurement unit is transit time. With transit time and a known acoustic pathlength, velocity or speed of sound,
or both, can be calculated. Instrument out
...