Kumar, Lokesh and Saha, Debdulal and Khan, Shakeb A and Sengupta, Kamalendu and Islam, Tarikul (2012) A medium-range hygrometer using nano-porous thin film of gamma-Al2O3 with electronics phase detection. IEEE Sensors Journal, 12 (5). pp. 1625-1632. ISSN 1530-437X

[img] PDF - Published Version
Restricted to Registered users only

Download (1501Kb) | Request a copy


Present work deals with the development of a low-cost prototype RH meter for measuring humidity in the range of 1-10% RH. The sensor working on capacitive technique consists of porous thin film of gamma-Al2O3 formed between the parallel gold electrodes. The film was fabricated by dipcoating of sol solution obtained from the sol-gel method. The pore morphology of the sensor has been characterized by XRD, FESEM and BET analysis. The electrical parameters of the sensor have been determined by Agilent 4294A impedance analyzer. Response (similar to 10 s) and recovery (similar to 16 s) times of the sensor are better than the commercial sensor utilized for calibration (Xentaur, USA, LPDT-100). A suitable signal condition circuit has been developed to convert the capacitance change into voltage signal. For direct display of the humidity, the output of the sensor has been linearized by diode function generation. The prototype instrument has the potential for measuring humidity in different applications.

Item Type: Article
Uncontrolled Keywords: Capacitive sensor; Dip-coating; parallel electrode; Porous alumina; Prototype RH meter; Sol-gel science
Subjects: Engineering Materials
Divisions: Sensor and Actuator
Depositing User: Bidhan Chaudhuri
Date Deposited: 01 Jun 2012 06:22
Last Modified: 01 Jun 2012 06:22
URI: http://cgcri.csircentral.net/id/eprint/1453

Actions (login required)

View Item View Item