@inproceedings{78ddf7cdcc6b4cc889be15e5d5f32780,
title = "GaAs/AlGaAs heterostructure based micro-hall sensors and response to A.C. excitation",
abstract = "Hall sensors are fabricated from GaAs/AlGaAs based heterostructures. The sensors are characterized for sensitivity using A.C and D.C. excitation techniques w.r.to a known magnetic field in the range of 0-100Oe. Sensitivities of the order of 1000V/AT are obtained with a low variation of 0.15% in the temperature range of 30°C-100°C. A.C excitation (30Hz to 1 kHz) for the sensor current and phase-sensitive detection of the Hall Voltage are used to eliminate thermo-emfs and its drift with a consequent improvement in data acquisition rates of >50% over that of D.C excitation. This improves scan rates in applications such as magnetic flux leakage (MFL) measurements. The sensitivity is independent of the frequency of excitation as expected; however, the zero-field Hall voltage 'offset' value is found to have small frequency dependence.",
keywords = "A.C. excitation, GaAs/AlGaAs, Hall sensor, Magnetic Flux Leakage",
author = "{Ravi Kumar}, Ch and Abhilash, {T. S.} and Rao, {B. P.C.} and T. Jayakumar and G. Rajaram",
year = "2012",
doi = "10.3233/978-1-60750-968-4-241",
language = "English",
isbn = "978-160750967-7",
series = "Studies in Applied Electromagnetics and Mechanics",
publisher = "IOS Press",
pages = "241--246",
editor = "B.P.C. Rao and T. Jayakumar and Baldev Raj and Krishnan Balasubramanian",
booktitle = "Electromagnetic Nondestructive Evaluation (XV)",
address = "Netherlands",
}