LED (light emitting diode) light source with stable radiation spectrum and control device thereof

Abstract

The invention relates to an LED (light emitting diode) light source with a stable radiation spectrum and a control device thereof. The LED light source comprises an LED chip, an aluminium baseplate, aluminium heat radiation fins, a temperature sensor, a semiconductor refrigerating piece and a fan, wherein the LED chip is welded on the LED aluminium baseplate, the aluminium baseplate and the aluminum heat radiation fin are closely pasted through heat conduction silica gel, and a hole is punched on the aluminium heat radiation fin; the temperature sensor is inserted in the hole, a temperature sensor guideline is leaded out so as to seal the hole through the heat conduction silica gel, the heat conduction silica gel is used for pasting the other surface of one aluminum cooling fin on the semiconductor refrigerating piece, and the other surface of the semiconductor refrigerating piece is mutually pasted with the other aluminium heat radiation fin which is provided with a fan; and the LED light control device takes a singlechip as a control core, the semiconductor refrigerating piece is adopted as a temperature-controlling element, a constant current source circuit which is composed ofa current negative feedback provides working current for the semiconductor refrigerating piece, and the output current of the constant current source is controlled by the voltage output by a result control D / A (digital to analog) transducer after PID (proportion integration differentiation) operation by the singlechip. The LED light source provided by the invention is used for an open light path dusty gas spectrographic detection system, and provides the stable spectrum for the concentration inversion of a measuring system.

Description

technical field [0001] The invention relates to an LED light source and its control device, more specifically to an LED light source with stable radiation spectrum and its control device suitable for use in an open optical path pollution gas spectrum detection system. Background technique [0002] The open optical path pollution gas spectral detection technology is an optical method that uses the characteristic absorption of absorbing molecules in the ultraviolet to visible band to study the trace gas components in the atmosphere (stratosphere, troposphere). The concentration can be measured very low through long optical path absorption gas composition. This gas concentration detection technology can use natural light as a light source, such as sunlight, moonlight and starlight, and can also use artificial light as a light source. A typical light source is a xenon arc lamp. Xenon arc lamp is a broadband thermal light source, covering ultraviolet, visible to near-infrared. I...

AI Technical Summary

Problems solved by technology

However, xenon arc lamps also have shortcomings, mainly as follows: (1) xenon arc lamps not only emit continuous thermal spectrum, but also emit some discrete atomic absorption lines, which will introduce interference when inversion of gas concentration; (2) xenon arc lamps It is a heat source, only a small part is converted into light and used, and most of it is converted into heat and wasted

In order to obtain sufficient luminosity, the general power consumption needs hundreds of watts; (3) high maintenance cost

The typical life of xenon arc lamp is 200-3000 hours, and the continuous working life is only a few to ten weeks; (4) Xenon ionization requires a high voltage of 20KV to 30KV, which will bring potential shock waves and affect the normal operation of other electronic equipment; ( 5) The bulb is filled with high-pressure gas, and the explosion of the lamp may occur from time to time. If it is not handled properly, it will be dangerous

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