Method for detecting blue light leakage and fluorescent powder diaphragm rupture of laser headlamp

Abstract

The invention discloses a method for detecting blue light leakage and fluorescent powder diaphragm rupture of a laser headlamp. The method comprises the following steps: a control unit controlling a power supply to drive a laser light source, and reflecting white light emitted by the laser light source by a reflective tile to emit approximately parallel light; judging blue light leakage: respectively measuring to obtain voltages U1 and U2 by the first sensor and the second sensor, calculating the acceptable ranges of U1 and U2, and implanting the acceptable ranges into a control unit; measuring U1 and U2 in a receiving range in real time, judging that no blue light leakage occurs in the laser light source, otherwise, judging that blue light leakage occurs; and calculating the rupture areaof the fluorescent powder diaphragm: setting the light emitting area of the laser light source to be S1 and the rupture area of the fluorescent powder diaphragm to be S2, and when (S2 / S1) is more than10%, the rupture being more serious, more blue light being leaked, and the laser headlamp stopping emitting light. Whether the laser headlamp leaks blue light or not can be scientifically judged, themethod is suitable for judging blue light leakage of the laser headlamp, and the rupture area of the fluorescent powder diaphragm can be calculated.

Description

technical field [0001] The invention relates to the technical field of automobile detection, in particular to a detection method for blue light leakage of a laser headlamp and rupture of a fluorescent powder diaphragm. Background technique [0002] The laser light source mixes the blue light emitted by the laser and the yellow-green light produced by the phosphor to obtain white light. It has the characteristics of small size, high brightness, and large luminous flux. It can be used as a high beam or auxiliary high beam of a car. If there is a collision or violent vibration during the use of the laser light, the phosphor diaphragm may be broken, peeled off or punctured by the laser, causing part of the blue light to be emitted directly without passing through the phosphor diaphragm. At this time, the emitted blue laser If it is irradiated to the human eye, it is very easy to cause permanent damage (blue light hazard). Therefore, it is necessary to monitor the blue light of ...

AI Technical Summary

Problems solved by technology

This method has a relatively large light loss. At the same time, the absolute brightness is used to judge the blue light leakage. It is easily affected by external light and the consistency is poor. It needs to be calibrated one by one and cannot be mass-produced.

When blue light leaks, the output of the sensor is usually increased, which is the same effect as the headlight dimming situation, so the uniqueness of the determination is not good

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