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JJF 1934-2021: Calibration Specification for Ultrasonic Anemometers
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Calibration Specification for Ultrasonic Anemometers
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Basic data
| Standard ID | JJF 1934-2021 (JJF1934-2021) |
| Description (Translated English) | Calibration Specification for Ultrasonic Anemometers |
| Sector / Industry | Metrology & Measurement Industry Standard |
| Classification of Chinese Standard | A59 |
| Classification of International Standard | 17.140 |
| Word Count Estimation | 24,265 |
| Date of Issue | 2021-12-08 |
| Date of Implementation | 2022-06-08 |
| Issuing agency(ies) | State Administration for Market Regulation |
| Summary | This standard applies to the calibration of ultrasonic wind direction and speed measuring instruments for measuring two-dimensional wind fields. |
JJF 1934-2021: Calibration Specification for Ultrasonic Anemometers
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National Metrology Technical Specifications of the People's Republic of China
Calibration specifications for ultrasonic wind direction and speed measuring instruments
Released on 2021-12-08
2022-06-08 Implementation
Released by the State Administration for Market Regulation
Ultrasonic wind direction and wind speed measuring instrument
Calibration specification
Responsible unit: National Meteorological Measuring Instruments Measuring Technical Committee
Main drafting unit: Meteorological Observation Center of China Meteorological Administration
Participating in the drafting unit: Hubei Provincial Meteorological Information and Technical Support Center
Heilongjiang Atmospheric Sounding Technology Support Center
Xinjiang Meteorological Technology Equipment Support Center
Jiangsu Institute of Radio Science Co:, Ltd:
This specification entrusts the National Meteorological Measuring Instruments and Measuring Technical Committee to be responsible for interpretation
The main drafters of this specification:
Bian Zeqiang (Meteorological Observation Center of China Meteorological Administration)
Li Songkui (Meteorological Observation Center of China Meteorological Administration)
Liu Xin (Meteorological Observation Center of China Meteorological Administration)
Participating drafters:
Zeng Tao (Hubei Meteorological Information and Technical Support Center)
Huang Qingzhi (Heilongjiang Atmospheric Sounding Technology Support Center)
Ma Jing (Xinjiang Meteorological Technology Equipment Support Center)
Zhou Qi (Jiangsu Institute of Radio Science Co:, Ltd:)
Table of contents
Introduction (Ⅱ)
1 Scope(1)
2 References(1)
3 Terms and units of measurement(1)
3:1 Terminology(1)
3:2 Units of measurement(1)
4 Overview(1)
5 Metrological characteristics* (2)
5:1 Wind speed indication error (2)
5:2 Wind direction indication error (2)
5:3 Wind speed direction error (2)
6 Calibration conditions(2)
6:1 Environmental conditions (2)
6:2 Metrology standard measuring equipment and other equipment (2)
7 Calibration Items and Calibration Methods(3)
7:1 Calibration items(3)
7:2 Calibration method(3)
8 Expression of Calibration Results(4)
9 Recalibration interval(5)
Appendix A Calculation method of standard wind speed value (6)
Appendix B Calibration Records of Ultrasonic Wind Direction and Velocity Measuring Instruments (Reference Format) (7)
Appendix C Calibration Certificate (Reference Format) (8)
Appendix D Example of Uncertainty Assessment of Wind Velocity Measurement (11)
Appendix E Example of Wind Direction Measurement Uncertainty Assessment (16)
Introduction
JJF 1071 "Rules for Compilation of National Metrology and Calibration Standards", JJF 1001 "General Metrology Terms and Definitions",
JJF 1059:1 "Assessment and Expression of Measurement Uncertainty" together constitute the basic series supporting the preparation of this specification
specification:
This specification is published for the first time:
Calibration specifications for ultrasonic wind direction and speed measuring instruments
1 Scope
This specification applies to the calibration of ultrasonic wind direction and speed measuring instruments for measuring two-dimensional wind fields:
2 References
This specification references the following documents:
JJG431-2014 Portable three-cup wind direction anemometer
QX/T 8-2002 Meteorological Instrument Terminology
QX/T 84-2007 Meteorological low-speed wind tunnel performance test specification
For dated references, only the dated version applies to this specification; for undated references
document, its latest version (including all amendments) applies to this specification:
3 Terminology and units of measurement
3:1 Terminology
3:1:1 wind direction
The direction of the wind:
[Source: QX/T 8-2002, definition 5:4:2]
3:1:2 wind speed
The distance air moves per unit time:
[Source: QX/T 8-2002, definition 5:4:3]
3:1:3 Ultrasonic anemometer
A wind measuring instrument made according to the principle that the propagation speed of ultrasonic waves in the air changes with the change of wind speed:
[Source: QX/T 8-2002, definition 5:4:46]
3:1:4 Wind speed and direction characteristics directionalresponse
The ultrasonic wind direction and wind speed measuring instrument is installed vertically, and can be measured from any direction under a certain fixed wind speed in the horizontal direction:
errors caused by the quantity:
3:2 Units of measurement
The unit of measurement for wind speed is meter per second (m/s); the unit of measurement for wind direction is degree (°):
4 Overview
Ultrasonic wind direction and wind speed measuring instrument is to use the sending sound wave pulse to measure the time or frequency of the receiving end (Doppler
Transformation) difference to calculate the wind speed and direction of the measuring sensor or measuring instrument: Its appearance is shown in Figure 1:
Ultrasonic wind direction and wind speed measuring instruments are usually composed of sending end, receiving end, bracket, data acquisition and other parts: hair
The sending end and the receiving end are equidistantly parallel at a certain distance, and the sending end sends out sound waves, which will
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