White LED light source generation device of transmission type visibility meter

Abstract

The invention discloses a white LED light source generation device of a transmission type visibility meter. The white LED light source generation device comprises an LED light-emitting device (1), an optical splitter (4), a beam shaping device (5) and a light intensity detector (7). The input end of the LED light-emitting device (1) is electrically connected with a controller (8) through a signal generator (2). The optical splitter (4) is arranged on an output light path of the LED light-emitting device (1). The light intensity detector (7) is arranged on the output light path of the optical splitter (4), and the output end of the light intensity detector (7) is electrically connected with the controller (8). Particularly, the LED light-emitting device (1) emits white light, and the output light color temperature is 3000 K. The optical splitter (4) is an optical fiber optical splitter, wherein a first downlink optical interface (41) is located at a focus point of the beam shaping device (5), and a second downlink optical interface (42) is in optical connection with the light intensity detector (7). The output light path of the beam shaping device (5) is provided with a concave mirror (51), with the focal distance being 1200 mm, of an iris diaphragm (6), and the control end of the iris diaphragm (6) is electrically connected with the output end of the controller (8). The white LED light source generation device can serve as an ideal light source of the high-measuring-accuracy transmission type visibility meter.

Description

technical field [0001] The invention relates to an LED light source generating device, in particular to a white LED light source generating device for a transmissive visibility meter. Background technique [0002] Visibility is an index that reflects the transparency of the atmosphere. Meteorologically, it refers to the maximum horizontal distance that a person with normal eyesight can see and recognize the target from the sky background under the weather conditions at that time. It can be objectively measured and used in meteorological optical vision. Cheng said. Meteorological optical visual range refers to the atmospheric path length that the parallel beam luminous flux of an incandescent lamp with a color temperature of 2700K weakens to 0.05 of its initial value. Recently, people have made some beneficial attempts and efforts to obtain more accurate visibility, such as a small high-performance scattering-type visibility measurement device and measurement method publishe...

AI Technical Summary

Problems solved by technology

Although this kind of scattering visibility measuring device can also measure the visibility, there are some shortcomings. First, the distance between the emitting part and the detecting part is too small, which greatly restricts the measurement accuracy; secondly, when measuring this too small volume When sampling the scattering coefficient of the space, the absorption is ignored, and the scattering coefficient is considered to be equal to the extinction coefficient, so there is a systematic error, resulting in low measurement accuracy; again, the structure of the emitting part is too complicated, which not only makes it difficult to reduce the manufacturing cost, but also extremely It is easily affected by the external environment and cannot work stably and reliably for a long time, which will bring a lot of inconvenience to future use and maintenance

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