Arrayed LED area light source

Abstract

An arrayed LED area light source belongs to the field of optical detection and is capable of vertically illuminating sample solution. Arrayed LEDs are mounted on one surface of a circuit board, a circular hole is reserved at the center of the circuit board, a concave reflector is mounted on one surface, mounted with the LEDs, of the circuit board, a front convex lens is arranged on the other surface of the circuit board, a sample reservoir is arranged between the front convex lens and a rear convex lens, a light-splitting optical system is arranged behind the rear convex lens, and a slot is reserved on the light-splitting optical system. By above technical scheme, the arrayed LED area light source has the advantages that a plurality of LEDs are utilized as light sources to combine the arrayed LED area light source; is uniform in luminous intensity, good in heat stability and long in service life; and improves detection accuracy of the sample solution when being matched with a double focusing optical system. The arrayed LED area light source can be widely used to a detecting instrument of a light-splitting system.

Description

technical field [0001] The invention belongs to the field of optical detection. Background technique [0002] The technology of sample detection by spectrophotometry is quite mature and widely used. Among them, LED has been quite common as the instrument light source. And multiple LED arrays also appear in this type of testing instrument as the same instrument light source. However, people have also found some shortcomings of the LED array light source in long-term practice. When the LED array combined surface light source is used to directly illuminate the sample cell, the light emitted by each LED may not be irradiated vertically on the incident slit of the spectroscopic system, and most of the light sources enter at a certain angle to the vertical line of the incident slit. slit. [0003] Such as Figure 4 As shown, the solid line in the figure is the light emitted from the LED, passing through the sample solution and entering the incident slit. Let the ray deviate f...

AI Technical Summary

Problems solved by technology

From the above analysis, it can be concluded that in the case of non-perpendicular light irradiation, the change in the refractive index of the sample solution will cause the angle of the LED light entering the slit to change from the axis, resulting in a change in the intensity of the incident light, which will cause measurement errors

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