No abstract

The paper presents an initial investigation into the energy and operational parameters of three LED modules produced by a little-known producer. The paper considers the requirements of Standards TM-21-11 and LM-80-08 applicable in measuring lumen maintenance life, as well as the requirements for temperature in measuring illuminance. The investigation introduces the structural schemes for measuring the efficiency coefficient of the AC/DC converter of LED modules and provides the obtained measurement results. The performed measurements show that the efficiency coefficients of the AC/DC converters of the examined LED modules amount to 52 %±3.5 %. According to the experimental results obtained after measuring illuminance, the established average lumen maintenance life L70 is 2,817 hours.

Non-contact surface measurement methods as well as roughness parameter determination methods are analyzed in the paper. While most of the modern non-contact surface inspection methods require advanced instrumentation and a big budget, this study looks into a novel approach to non-contact encoder disc roughness measurements by using the proposed system attached to the rotary table with an implemented optical disc pick up head and the reference angle encoder. Application of a conventional optical disc laser reading system resulted in a cost effective and compact solution for a nondestructive angle encoder disc surface inspection. Assets and shortcomings as well as detailed analysis of the measurement procedure are explained in the paper. The experimental setup and the measurement results are presented within this article.

No abstract

No abstract