Title :
Dew Point and Relative-Humidity Smart Measuring System
Author :
Postolache, Octavian ; Giräo, P. M B Silva ; Pereira, J. M Dias ; Ramos, Helena Geirinhas
Author_Institution :
Inst. de Telecomunicaoes, Lisbon
Abstract :
In this paper, a new design and implementation of an air dew-point smart measuring system are presented. The system also implements a relative-humidity sensing structure, based on dew point (DP) and ambient-temperature measuring channels acquired data, and its design suits particularly laboratory applications. The DP is detected on the surface of a chilled mirror using an optical system. The main elements of the measuring system are a bifurcated-fiber bundle, a laser diode, and a narrowband optical detector. Mirror cooling is made using a current-mode-powered Peltier heat pump. The current control is performed using a digital controller implemented using a data-acquisition board programmed with LabVIEW software
Keywords :
humidity measurement; measurement systems; semiconductor lasers; virtual instrumentation; LabVIEW software; bifurcated-fiber bundle; current control; current-mode-powered Peltier heat pump; data-acquisition board; dew point; digital controller; intelligent control; laser diode; mirror cooling; narrowband optical detector; optical detection; relative-humidity smart measuring system; virtual instrumentation; Bifurcation; Cooling; Diode lasers; Laboratories; Mirrors; Narrowband; Optical detectors; Optical pumping; Optical sensors; Particle measurements; Calibration; dew-point (DP) measurement; intelligent control; optical detection; relative humidity (RH); virtual instrumentation;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2006.884132
