A transient calorimeter pyrheliometer of high accuracy

The problems of how to improve the accuracy and keep the stability of the transient calorimeter pyrheliometer have been solved by the following methods: (i) a hemispheric mirror shell with a small hole at its top is situated over a copper disk sensor. The inner wall of the shell has high reflectivit...

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Bibliographic Details
Published in:Solar energy 1990, Vol.45 (2), p.79-83
Main Authors: Cheng, S.X., Ge, X.S., Li, J.A., Feng, H.Q.
Format: Article
Language:English
Subjects:
140100 - Solar Energy- Resources & Availability
ABSORPTION
ACCURACY
Applied sciences
CALORIMETRY
COMPARATIVE EVALUATIONS
COMPUTERIZED CONTROL SYSTEMS
CONTROL SYSTEMS
COPPER
DATA PROCESSING
DESIGN
ELEMENTS
ENERGIA SOLAR
ENERGIE SOLAIRE
Energy
ERRORS
ESTABILIDAD
Exact sciences and technology
INSTRUMENT
INSTRUMENTOS
INSTRUMENTS
MEASUREMENT
MEASURING INSTRUMENTS
MEDICION
MESURE
METALS
MODIFICATIONS
Natural energy
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PROCESSING
PYRHELIOMETERS
SOLAR ENERGY
SOLAR EQUIPMENT
SOLAR FLUX
SPECTRAL REFLECTANCE
STABILITE
STABILITY
TELESCOPES
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
TRANSITION ELEMENTS
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Summary:The problems of how to improve the accuracy and keep the stability of the transient calorimeter pyrheliometer have been solved by the following methods: (i) a hemispheric mirror shell with a small hole at its top is situated over a copper disk sensor. The inner wall of the shell has high reflectivity, acting as a specular reflector. In this way, the effective absorptance of the sensor with the mirror can approach unity, and can be kept in long-term stability; (ii) a micro-computer is adopted as controller and data processor of the pyrheliometer. So the total error of the measuring system is less than 0.1%. Results of comparing our instrument with the cavity-type pyrheliometers, such as Eppley HF self-calibrating and TMI Mark-VI pyrheliometer, show that the maximum relative deviation, the average deviation, and the standard deviation are less than 0.6%, 0.12%, and 0.23%, respectively.
ISSN:0038-092X
1471-1257
DOI:10.1016/0038-092X(90)90031-7