Papers by Keyword: QPD

Abstract: Sleep quality and mental health are directed influence to dormitory air quality. Sleep mode Work schedules is established by questionnaires, after the interconnection of PAQ, QPD and ACC is analysised, air quality of dormitory building is assessmented. The results show that dormitory air quality is influenced by windowing and living habit of undergraduate and the proportion of the dissatisfaction of air quality below 20%.

Abstract: Requirement for precision measurement becomes extremely advanced as industrial needs advances. CMM (Coordinate Measuring Machine) is one of the most adequate measuring machines to meet the requirement. As the precision of CMM becomes higher, it is important to improve the sensitivity of probe. We developed a contact type probe which consisted of a QPD (quadratic photo diode), a ball lens, and a laser diode to detect the displacement of stylus. The probe system has a resolution of 31nm.