Overview of Double Ten science and technology on radiometry
Date：2022/8/4 8:54:57 / Read： / Source：本站
Radiometry is an experimental science of quantitative evaluation of radiation such as laser, in which the light band of
Radiation, acting on objects and living organisms, produces a variety of physical, chemical and biological effects, and the degree of these effects
Quantity is also part of radiology. It is related to the composition and strength of radiation and the physiological characteristics of human visual organs
People's psychological activities are related. Photometry is based on the physiological properties and certain conventions of the human visual apparatus
Specifications to evaluate the visual effects of radiation.
In 1937, the Comite International des Poids et Mesures,
Stilt (stilt =1 candle · 1 cm 1 2). The resulting luminous intensity unit is called a Candela
Candela (Candela), symbol "CD", was implemented on January 1, 1948. At this point, the whole I silk circle has a unified
Radiometry originated from the physical study of the thermal radiation properties of objects. About absolute blackbody radiation properties
The research results have laid the foundation of radiation measurement. Along with thermal radiation in industry, agriculture, military and scientific research
The application of radiation measurement is becoming more and more widespread, and the importance of radiation measurement is also increasing. So radiometric techniques get
Great development, and gradually infiltrated into the luminosity. From the dominance of photometric techniques by visual methods, gradually
The transition to physical methods using a variety of photoelectric and thermoelectric receivers has greatly improved measurement accuracy and efficiency
For efficiency. On the other hand, in radiometry, the expression method of photometry is also borrowed to describe the radiation source and
A theoretical system similar to that of photometry has been established for various radiation properties of the irradiation field. Between the two subjects
Establish a close connection. In 1979, the 16th International Metrology Congress redefined Candela: Candela is emitting frequency
The luminous intensity of a light source with 540x10" Hertz (Hz) radiation in a given direction
The radiation intensity is 1/683 watt (W) per spherical degree. At this point, photometry was completely based on radiology
On. Using light instead of platinum solidification temperature to specify can get rid of the temperature scale and temperature measurement on the optical radiation metric and it
The impact of measurement.
2. Base wood definition
In both photometry and radiology, the object of measurement is radiation, but photometry refers to the spoke of the optical band
Shoot. The corresponding physical quantities are called photometry and radiosity respectively, which are referred to as light measure and radiosity for short
The amount. There is a one-to-one correspondence between the definitions and the defining equations. In case of confusion, the radiometric symbol is added
Subscript 'e', and subscript' V 'on the light metric, such as the radiometric Qe' Pe' Oe' Ie' Le'
Ee, etc., the light metric corresponding to the door is Qv, Pv, (Pv, Iv, Lv, Mv, Ev, etc. Need to explain
When considering photon detection, radiant energy is often replaced by photon number, and radiant power is represented by flux 0
For radiation of a continuous spectrum, the spectral quantities are described by prefacing their names with the word "spectrum" and placing it under
The corresponding symbol of the gate is appended with the symbol of wavelength 'A' as the subscript, for example, the spectral flux is denoted as}P,*, etc.
Both radiometric and optical metrics are functions of wavelength. For radiation with a continuous spectrum, a certain degree of radiosity
The spectral intensity of a quantity Xe(i.e. radiation intensity, radiation brightness, etc.) is defined as the infinity that contains the duration of a given wave
In a small wavelength interval, the quotient of the corresponding radiometric measure and the wavelength interval, i.e
The spectral intensity of a radiometric as a function of wavelength is called the spectral distribution of the radiometric.
A similar definition can be given for the optical metric. The relationship between the light metric and the radiation metric can be expressed as