Light damage measurement instrument based on relationship between pupil size and ambient brightness

Abstract

The invention relates to a light damage measurement instrument based on the relationship between pupil size and ambient brightness, which consists of a light source, a field diaphragm, a control table, an illuminance probe, a controllable diaphragm, an integrating sphere, a spectrometer and a computer, wherein the light source, the field diaphragm and the integrating sphere are positioned on the control table respectively, the controllable diaphragm is connected with the integrating sphere which is connected with the spectrometer, the spectrometer is connected with the computer which is connected with the illuminance probe and the controllable diaphragm, the illuminance probe sends illuminance to the computer in the form of electric signal, the computer converts the illuminance value to a brightness value by means of computation, determines the size of pupil in human eyes under relevent situations according to the brightness level of the brightness value, and sends a control signal to change the size of the controllable diaphragm, afterwards, brightness is measured and finally, relevant spectrum data and brightness are obtained in the computer. The instrument effectively simulates the quantity of light entering pupil under different brightness levels through the controllable diaphragm; the data derived from measurement accords better with actual situation. Measurement precision can be effectually improved by the integrating sphere instead of using a portable optical spectrum instrument directly. Direct brightness measurement is replaced by the use of the illuminance probe for measurement.

Description

technical field [0001] The invention belongs to the field of lighting measurement and its corresponding photobiological safety measurement, and in particular relates to a light hazard measuring instrument based on the relationship between pupil size and ambient brightness. Background technique [0002] Photobiological research in recent years has shown that optical radiation is closely related to human health. Whether it is ultraviolet light, visible light, or infrared light, it can have a positive impact on human physiology under appropriate exposure conditions. However, when the exposure is insufficient or excessive, the impact of optical radiation is either negligible or potentially harmful. As shown in Table 1, inappropriate light can cause certain damage to the human body. [0003] Table 1 The damage of light to human beings: [0004] [0005] Current research shows that high-intensity light radiation can cause harm to the human eye: 1. When high-intensity ultravio...

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Problems solved by technology

[0005] Current research shows that high-intensity light radiation can cause harm to the human eye: 1. When high-intensity ultraviolet rays irradiate the human eye, the outermost cells of the cornea and conjunctiva will be destroyed at the beginning, and 6- After 8 hours, the human eye will have an obvious foreign body sensation, which may cause photo-induced keratitis and photo-induced conjunctivitis; 2. Under the action of light, molecules will have special chemical and physical properties after absorbing light energy, which can produce some special effects. For the human eye, the photochemical reaction caused by long-term ultraviolet radiation will change the special protein in the lens, resulting in intracellular pigmentation, unclear lens, and even loss of vision, causing cataracts; 3. When very strong light When the radiation is irradiated on the retina, the thermal effect of the light radiation can burn the retina, such as figure 1 Shown, D pupil Is the diameter of the pupil, the largest case is about 7mm, D ret Is the imaging area on the retina, the smallest diameter is about 10 microns

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