GB/T 33867-2017 Hemispherical pyrheliometer method for measuring photosynthetically active
radiation GB/T33867-2017 |tt||Standard compression package decompression password: www.bzxz.net This standard specifies the requirements for observation sites, measurement systems, data collection and processing, instrument installation and maintenance for the hemispherical pyrheliometer method for measuring photosynthetically active radiation. This standard is applicable to the measurement of photosynthetically active radiation in the fields of meteorology, environment, agriculture, etc.

ICS07.060
National Standard of the People's Republic of China
GB/T33867—2017
Measurement of photosynthetic active radiation
Hemispherical radiometer method
Measurement for photosynthetic active radiation-Hemispherical radiometer method
Issued on 2017-07-12
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Administration of Standardization of the People's Republic of China
Implementation on 2018-02-01
2 Normative references
Terms and definitions
Site requirements
Measurement system
Data acquisition and processing
Installation and maintenance
References
GB/T33867—2017
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This standard was drafted in accordance with the rules given in GB/T1.1-2009. This standard was proposed by the China Meteorological Administration.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Meteorological Instruments and Observation Methods (SAC/TC507). GB/T33867-2017bzxZ.net
The drafting units of this standard are: Meteorological Detection Center of China Meteorological Administration, Xinjiang Atmospheric Detection Technology Support Center, Sichuan Atmospheric Detection Technology Support Center, and Jiangsu Radio Science Research Institute Co., Ltd. The main drafters of this standard are: Yang Yun, Ding Lei, Quan Jimei, Chong Wei, Lin Bing, Wu Ning, Zhang Hu, and Xu Yigang. Since
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1 Scope
Hemispherical pyrheliometer method
Photosynthetically active radiation measurement
GB/T33867—2017
This standard specifies the requirements for observation sites, measurement systems, data acquisition and processing, instrument installation and maintenance for the measurement of photosynthetically active radiation using a hemispherical pyrheliometer.
This standard is applicable to the measurement of photosynthetically active radiation in the fields of meteorology, environment, agriculture, etc. 2 Normative references
The following documents are indispensable for the application of this document. For any dated referenced document, only the dated version applies to this document. For any undated referenced document, its latest version (including all amendments) applies to this document. GB/T31163-2014 Solar energy resource terminology 3 Terms and definitions
The terms and definitions defined in GB/T31163-2014 and the following terms and definitions apply to this document. 3.1
Photosynthetically active radiation photosynthetically active radiation; PAR The radiation energy in a certain band in the solar radiation spectrum that can be absorbed, converted and used for the synthesis of organic matter by the plastid pigments of green plants. Note: Solar radiation from 400nm to 700nm is generally called photosynthetically active radiation. [GB/T31163-2014, definition 5.8]
Photosynthetically active radiation meter photosynthetically active radiation meter hemispherical photosynthetically active radiation meter hemispherical photosynthetically active radiation meter that measures the total solar radiation from 400nm to 700nm received by a given plane within a 2-unit solid angle from above. 4 Site requirements
Areas that can represent common local characteristics should be selected to avoid places with serious air pollution such as local fog and smoke. There should be no obstacles with an altitude angle exceeding 5 within the instrument's field of view. There should be no radiation interference sources around that affect the change of the instrument's indication. 5 Measurement system
5.1 Composition
It consists of a photosynthetically active radiation meter, a data logger, a mounting bracket, and a power supply module. 5.2 Technical indicators
5.2.1 The photosynthetically active radiation meter
should meet the following requirements:
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GB/T33867—2017
Response time (95% response) is not more than 10ms; a)
b) Non-linear error is not more than 4%;
c) Azimuth response (above the solar altitude angle of 10°, within the azimuth angle of 360°) is not more than 10%; d) Temperature error (within the range of -20℃～60℃) is not more than 5%; e)
Annual stability is not more than 5%.
Data collector
Should meet the following requirements:
a) The measuring range is -25mV~+25mV:
b) The measuring error should not be greater than 0.5% (full scale); serial communication interface (RS-232, RS-485/422) or wireless transmission. 6 Data collection and processing
6.1 Time system and day boundary
The local mean solar time is adopted, and the local mean solar time 24 hours is the day boundary. 6.2 Collection method
6.2.1 If the output value of the photosynthetic active radiation meter is irradiance, it is collected directly. 6.2.2 If the output value of the photosynthetic active radiation meter is a voltage value, the voltage signal is converted into an irradiance value according to formula (1): V
Wherein:
irradiance, in watts per square meter (W/m2); V
voltage output value of the photosynthetic active radiation meter, in microvolts (μV); K—sensitivity of the photosynthetic active radiation meter, in microvolts per square meter per watt (EμV/(W·m-2)]. 6.3 Sampling and algorithm
6.3.1 Sampling time
The sampling time interval is 15.
6.3.2 Quality control of sampling values
6.3.2.1 The sampling value is judged to be valid if it is within the upper and lower limits specified in Table 1. 6.3.2.2 The change value of two adjacent sampling values ​​should be within the allowable range of Table 1. (1)
6.3.2.3 When calculating the minute average irradiance, the number of valid sampling samples should be greater than 2/3 of the total number of sampling samples, otherwise the minute average value will be judged as "missing measurement".
Table 1 Identification conditions for "valid" photosynthetically active radiation sampling values ​​Type
Irradiance
Limit value
Unit is watt per square meter
Two adjacent sampling values ​​are allowed
Maximum change value
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Calculation of minute average irradiance
Calculated according to formula (2):
Where:
—arithmetic mean of irradiance per minute;
GB/T33867—2017
·（2）
E, the instantaneous value (sample) of the ith sampling in one minute, judged according to Table 1, the invalid sampling value is recorded as E, = 0; m
The number of "valid" samples in the measurement period. Minute irradiance
The minute average irradiance multiplied by 60s.
Hourly irradiation
The accumulated value of minute irradiation within 1h.
Daily irradiation
The accumulated value of hourly irradiation within 1d.
6.4 Data records
Should at least include local time, minute average, minute minimum irradiance value, minute maximum irradiance value, minute average standard deviation, hourly irradiance and daily irradiance.
7 Installation and maintenance
7.1 Installation and maintenance of photosynthetic active radiation meter 7.1.1
Preparation before installation
Visually check that the instrument is intact and the instrument calibration certificate is valid. 7.1.2
Place the instrument with the terminal facing north, adjust the level, and fix the installation. 7.1.3
Daily maintenance
Daily maintenance should be performed on the photosynthetically active radiation meter, and the following should be achieved: the instrument should be intact and level;
The instrument should be clean. If there is dust, frost, fog and raindrops, it should be cleaned promptly with a lens brush and lens paper or suede. Note that the receiving surface should not be scratched or worn;
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GB/T33867—2017
c) If the receiving surface is scratched, the instrument should be replaced in time. 7.1.4 Calibration
It should be sent to the legal metrology agency for calibration regularly; when replacing or repairing important parts, or when there is doubt about the performance of the instrument, it should be calibrated in time. 7.2
Installation and maintenance of the data acquisition system
Installation and maintenance should be carried out in accordance with the product manual. 4
References
GB/T31156-2014 Solar resource measurement Total radiation
QX/T55-2007 Specification for surface meteorological observations Part 11: Radiation observations GB/T33867—2017
World Meteorological Organization.Guide to Meteorological Instruments and Methods of Observation (Seven the Ditian), No. 8, 2oo8[4]
hPropramme.Baseline Surface Radiation Network (BSRN), World Climate Research
operations manual, version 2.1GB/T33867-2017
People's Republic of China
National Standard
Hemispherical pyrheliometer method for photosynthetically active radiation measurement GB/T33867—2017
Published and distributed by China Standards Press
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