GB/T 34287-2017 English PDF

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GB/T 34287-2017: Greenhouse gas -- Methane measurement -- Off-axis integrated cavity output spectroscopy method
Status: Valid

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Basic data

Standard ID: GB/T 34287-2017 (GB/T34287-2017)
Description (Translated English): Greenhouse gas -- Methane measurement -- Off-axis integrated cavity output spectroscopy method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A47
Word Count Estimation: 9,982
Date of Issue: 2017-09-07
Date of Implementation: 2018-04-01
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 34287-2017: Greenhouse gas -- Methane measurement -- Off-axis integrated cavity output spectroscopy method

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Greenhouse gas - Methane measurement - Off-axis integrated cavity output spectroscopy method ICS 07.060 A47 National Standards of People's Republic of China Greenhouse gas methane measurement Off-axis integrated cavity output spectroscopy 2017-09-07 Posted 2018-04-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released Directory Foreword Ⅲ Introduction IV 1 Scope 1 2 Terms and definitions 1 3 Method Overview 1 3.1 Methodology 1 3.2 Method Types 2 4 measurement conditions 2 4.1 The main technical indicators 2 4.2 key components 2 5 Measurement Preparation 3 5.1 Sample Preparation 3 5.2 Equipment Preparation 3 5.2.1 Linear Test 3 5.2.2 Repeatability test 3 5.2.3 Drift test 3 6 measurement methods 3 6.1 direct measurement method 3 6.2 standard gas standard measurement method 4 7 standard school method 4 Reference 5

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard is proposed by China Meteorological Administration. This standard by the National Climate and Climate Change Standardization Technical Committee Atmospheric Composition Observation and Warning Service Technical Committee (SAC / TC540/SC1) centralized. This standard drafting unit. China Meteorological Bureau Meteorological Exploration Center, Beijing Meteorological Bureau, National Satellite Meteorological Center. The main drafters of this standard. Zhang Xiaochun, Zhou Huagang, Jia Xiaofang, Wen Min, Wang Myanmar, Jin Junli, Zhang Xing wins, Lin Weili, Tang Jie.

Introduction

The warming caused by the greenhouse effect has brought remarkable influence on the global climate, ecology and economic development, National governments, scientists and the public extensive attention. Methane is one of the main greenhouse gases in the atmosphere. It is an accurate and accurate method to measure the spectral output of greenhouse gas methane off- Reliable measurement data, specially formulated this standard. Greenhouse gas methane measurement Off-axis integrated cavity output spectroscopy

1 Scope

This standard specifies the use of off-axis integrated output spectroscopy method to measure the concentration of greenhouse gases in the ambient atmosphere gas method overview, measurement conditions, Measurement preparation, measurement methods and standard calibration methods. This standard applies to the measurement of greenhouse gas methane concentration.

2 Terms and definitions

The following terms and definitions apply to this document. 2.1 Standard gas standardgas To clean the air as the next gas, the concentration of the target substance is known as a mixed gas. Note. Rewrite QX/T 125-2011, Definition 10.2. 2.2 Working standard gas workingstandardgas The standard gas used for the quantitative measurement of the concentration of the target substance in the sample. Note. Rewrite QX/T 125-2011, Definition 10.8. 2.3 Target standard gas standardstandardgas A calibration gas used as a regular and repeat measure for the inspection and evaluation of the operating conditions of a measuring system. Note. Rewrite QX/T 125-2011, Definition 10.9. 2.4 Sample gas Gas measured by the measurement system. 2.5 Direct measurement method directmeasurementmethod The method of measuring the concentration of the target substance in the sample gas directly by using an off-axis integrating cavity output spectrometer. 2.6 Standard gas standard measuring method externalstandardmeasurementmethod The off-axis integral cavity output spectrometer is used to alternately measure the concentration responses of the working standard gas, the target standard gas and the target substance in the air, and then according to The working standard gas concentration of the target substance calculated target gas or air target substance concentration method.

3 Method Overview

3.1 method principle According to the characteristic absorption spectrum of the target substance, the laser with the specific wavelength is deviated from the optical axis and injected into the high-precision resonant cavity filled with the sample gas, Efficient reflection under the effect of continuous reflection, by measuring and comparing the intensity of incident light and transmitted light to get the sample gas in the target substance ......

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