Lai Canxiong

Prognostics and health monitoring of LED lighting system

Health monitoring of LED lighting systems is necessary for some safety critical and emergency applications. Prognostics and health monitoring (PHM) is a method for anomaly detection and remaining useful life (RUL) prediction. In this paper, the LED lighting system was defined as LED lamp which is composed of LED strings and an electrical driver. This paper introduced different PHM approach. An implementation prognostics and health monitoring roadmap for LED lamp was then presented. The PoF-based method for evaluating the reliability of LED driver was also demonstrated. Finally, data driven approach was used to assess the reliability and predict the remaining useful lifetime of LED lamp based on the test data during the sustaining natural exposure test.

Mechanisms of high power laser diode

A fault tree of high power laser diode have been set up, include sudden failure mode, gradual degradation mode, open failure and short failure mode are analyzed in detail with several cases, some methods about improving the reliability of laser diode have been provided subsequently in this paper.