Portable Plane Light Meter

Abstract

The invention relates to a portable plane illuminometer. Cosine correctors are arranged on the upper portion of each circular through hole on the top of a shell cover so as to form a cosine correctormatrix. A shading lattice matrix, an illumination sensor matrix, a concave mirror surface matrix and a three-color LED matrix are successively arranged directly below a circular through hole matrix. Adriving gear shaft is located in the middle position of each driven gear shaft. A driving gear on the driving gear shaft meshes with driven gears on the driven gear shafts of both sides. The drivinggear is welded with a rectangular permanent magnet rod. The inner side of the top of the shell cover is provided with an upper iron core. A circuit board is provided with a lower iron core. The anodeof a three-color LED is connected to the digital-analog converter end of a CPU, and a cathode is connected to a data selector MUX2. An illumination sensor is connected to the analog-digital converterADC1 of the CPU through a data selector MUX1, and the analog-digital converter ADC2 of the CPU is connected to a temperature sensor. The three control signal output ends of the CPU are connected to the upper iron core, the lower iron core and a liquid crystal display.

Description

technical field [0001] The invention relates to an indoor illuminance meter, in particular to a portable indoor local planar illuminance meter for measuring the illuminance of writing work areas of children. Background technique [0002] Children in my country have heavy learning tasks and are in the process of writing and reading for a long time. Whether the illumination of the desktop or screen is appropriate depends on the subjective judgment of parents or teachers, and lacks real-time monitoring of the illumination value. In particular, students often immerse themselves in their homework. Unaware of the gradual dimming of the environment and the deviation of one's sitting posture blocking the light, and no one supervises them. These situations have become one of the reasons why the myopia rate of students has remained high for many years. [0003] The indoor writing and reading area is a local work surface rather than a certain point. The illumination of each place in the...

AI Technical Summary

Problems solved by technology

[0003] The indoor writing and reading area is a local work surface rather than a certain point. The illumination of each place in the work surface will be different. For example, the light illumination in the reading area is dazzling, while the illumination in the writing area is dim. The illuminance value of a certain point in the surface represents the illuminance of the entire surface, and the average illuminance value of the working surface cannot be used to represent the illuminance of the entire surface

However, the current illuminance meter is only equipped with an illuminance sensor that can only measure the illuminance of a certain point, resulting in the need for multiple measurements to measure the illuminance of the entire work surface, especially for the illuminance measurement of a large area. For example, the patent publication number CN104406688B A kind of illuminance testing device for students learning with voice prompts, etc., either only displays the average illuminance value of the detection points of four illuminance sensors, such as a four-sensor illuminance meter disclosed in Patent Publication No. CN102538959A, etc., which cannot simultaneously measure each The illuminance of each place, and display the illuminance of each place at the same time

[0004] In daily life, many adults and children do not yet have knowledge about illuminance, and it is difficult to master the illuminance value of a conventional illuminance meter in units of lx. For this reason, Patent Publication No. CN102818626B discloses a illuminance with several different colors and brightness. Monochrome LED is a method of qualitatively expressing the illuminance measurement value of a certain point, but it indicates that the illuminance of a certain point is too dark, too dark,..., too bright, so it is necessary to use 5 different lights and cooperate with text descriptions, which is more complicated and still It is impossible to measure and display the illuminance of various places on the working surface at the same time

Images