CN112284528A

CN112284528A - Radiance meter

Info

Publication number: CN112284528A
Application number: CN202011135990.1A
Authority: CN
Inventors: 刘金元; 王彦飞; 贺书芳; 李玲; 吴志峰; 刘文德; 代彩红; 冯国进
Original assignee: National Institute of Metrology
Current assignee: National Institute of Metrology
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-01-29

Abstract

The invention discloses a radiance meter, comprising: the luminance meter imaging optical system comprises an imaging objective lens, a first reflector and a second reflector, wherein the imaging objective lens converges and images an optical signal from a measured object at the first reflector; the second reflector reflects the optical signal from the first reflector to the electronic viewfinder; the electronic viewfinder includes a CCD device that converts an optical signal from the second reflecting mirror into an electrical signal; the luminance meter photoelectric detector is used for detecting the optical signal converged and imaged at the first reflector and converting the optical signal into an electric signal; the electronic processing system is used for receiving the electric signal from the electronic viewfinder and the electric signal from the luminance meter photoelectric detector, processing the electric signals and outputting the processed electric signals to the display screen for display; the objective lens imaging focusing mechanism is used for receiving a control signal of the electronic processing system and adjusting the imaging optical system of the brightness meter so as to realize automatic focal length adjustment.

Description

Radiance meter

Technical Field

The present invention relates to a radiance meter, and more particularly, to an auto-focus luminance meter with an electronic viewfinder.

Background

A radiance meter is an instrument used to measure radiance. The measurement wavelength range can be divided into an infrared radiation luminance meter, a luminance meter (visible light band), and an ultraviolet radiation luminance meter. The luminance meter for visible light measurement is also called a gray scale meter, and can be classified into a black and white luminance meter and a color luminance meter according to functions, the black and white luminance meter can only measure luminance, and the color luminance meter can also measure parameters such as color.

Imaging illuminometers typically consist of an imaging objective, an aperture stop, a visual viewfinder, a detector and a signal processing system. Fig. 1 is a schematic structural diagram of an imaging luminance meter in the prior art. The imaging objective lens converges and images the detected luminophor at the small hole, and the size of the small hole determines the measurement area of the luminophor. During measurement, the eye lens is observed through human eyes, firstly, the reflector (generally provided with cross division scales) where the small hole is located is clearly imaged, then, the position of the imaging objective lens is adjusted to enable the luminous body to be clearly imaged at the position of the small hole, and the position of the luminous body where the small hole is located is the measurement position. The detector receives the optical signal and converts the optical signal into an electric signal, and then the electric signal is amplified by the electronic system and the result is displayed. The luminance meter can be calibrated to measure the luminance of the luminary. In the traditional brightness meter, the visual observation aiming system needs human eyes to observe, and the operation also needs human to manually adjust the focal length. This is inconvenient for many applications, such as those requiring remote measurements. In addition, because of the difference of human vision, it brings many inconvenient places in practical operation, such as the need of adjusting according to different vision.

Disclosure of Invention

In view of the above technical problems, the present invention provides a radiance meter comprising: the luminance meter imaging optical system comprises an imaging objective lens, a first reflector and a second reflector, wherein the imaging objective lens converges and images optical signals from a measured object at the first reflector; the second mirror reflects the optical signal from the first mirror to an electronic viewfinder; the electronic viewfinder includes a CCD device that converts an optical signal from the second reflecting mirror into an electrical signal; the luminance meter photoelectric detector is used for detecting the optical signal converged and imaged at the first reflector and converting the optical signal into an electric signal; the electronic processing system is used for receiving the electric signal from the electronic viewfinder and the electric signal from the luminance meter photoelectric detector, processing the electric signals and outputting the processed electric signals to a display screen for display; and the objective lens imaging focusing mechanism is used for receiving a control signal of the electronic processing system and adjusting the luminance meter imaging optical system so as to realize automatic focal length adjustment.

Optionally, the first mirror and the second mirror each comprise a cross-division scale.

Optionally, the display screen is a liquid crystal display screen and is used for parameter setting, measurement scene display and measurement result display.

The technical scheme of the radiant luminance meter has the beneficial technical effects that the electronic viewfinder is adopted, and the automatic focusing function of the luminance meter can be realized by matching with the electronic focusing system, so that the remote control measurement and operation of the luminance meter can be realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic diagram of a prior art imaging luminance meter.

Fig. 2 is a schematic configuration diagram showing detailed features of the luminance meter imaging optical system of the present invention.

Fig. 3 is a functional block diagram according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of systems consistent with certain aspects of the invention, as detailed in the appended claims.

Referring to fig. 2 and 3, the present invention provides a radiance meter, including: the luminance meter imaging optical system 1 comprises an imaging objective lens 11, a first reflecting mirror 11 and a second reflecting mirror 12, wherein the imaging objective lens 10 converges and images optical signals from a measured object at the first reflecting mirror 11; the second mirror 12 reflects the optical signal from the first mirror 11 to the electronic viewfinder 2; the electronic viewfinder 2 includes a CCD device 21, and the CCD device 21 converts an optical signal from the second reflecting mirror 12 into an electrical signal; a luminance meter photodetector 3 for detecting the light signal converged and imaged at the first reflecting mirror 11 and converting the light signal into an electrical signal; an electronic processing system 4 for receiving the electric signal from the electronic viewfinder 2 and the electric signal from the luminance meter photodetector 3, and outputting the processed electric signals to a display screen 5 for display; and the objective lens imaging focusing mechanism 6 receives a control signal of the electronic processing system 4 to adjust the luminance meter imaging optical system 1 so as to realize automatic focal length adjustment.

According to an alternative embodiment of the invention, the first mirror 11 and the second mirror 12 each comprise a cross-graduation.

According to an alternative embodiment of the present invention, the display screen 5 is a liquid crystal display screen for parameter setting, measurement scene display, and measurement result display.

The radiance meter of the invention adopts the electronic viewfinder, and can realize the automatic focusing function of the radiance meter by matching with the electronic focusing system, thereby realizing the remote control measurement and operation of the radiance meter.

The features and benefits of the present invention are illustrated by reference to the examples. Accordingly, the invention is expressly not limited to these exemplary embodiments illustrating some possible non-limiting combination of features which may be present alone or in other combinations of features.

The above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A radiant luminance meter, comprising:

the luminance meter imaging optical system comprises an imaging objective lens, a first reflector and a second reflector, wherein the imaging objective lens converges and images optical signals from a measured object at the first reflector; the second mirror reflects the optical signal from the first mirror to an electronic viewfinder;

the electronic viewfinder includes a CCD device that converts an optical signal from the second reflecting mirror into an electrical signal;

the luminance meter photoelectric detector is used for detecting the optical signal converged and imaged at the first reflector and converting the optical signal into an electric signal;

the electronic processing system is used for receiving the electric signal from the electronic viewfinder and the electric signal from the luminance meter photoelectric detector, processing the electric signals and outputting the processed electric signals to a display screen for display;

and the objective lens imaging focusing mechanism is used for receiving a control signal of the electronic processing system and adjusting the luminance meter imaging optical system so as to realize automatic focal length adjustment.

2. The radiant luminance meter of claim 1, wherein the first mirror and the second mirror each include a cross-division scale.

3. The radiant luminance meter as claimed in claim 1, wherein the display screen is a liquid crystal display screen for parameter setting, measurement scene display and measurement result display.