Search results for: Ghazanfar Hussain

Items from 1 to 7 out of 7 results

article

A comparison of image processing techniques for optical interference fringe analysis

Muhammad Farooq, Aasma Aslam, Babar Hussain, Ghazanfar Hussain, more

Photonic Sensors > 2015 > 5 > 4 > 304-311

We present a comparison of different techniques for the analysis of the shift and tilt in optical interference fringes. Fringe center, Radon transform, and Gaussian approximation methods are used for fringe analysis. We have measured the tilt and shift between two relevant fringe patterns. The error in tilt measurement was about 2%, and the displacement of the order of few nanometers was measured...

article

Large angular range carousel interferometer for spectroscopic applications

Sumara Ashraf, Ghazanfar Hussain, Masroor Ikram

Optics and Spectroscopy > 2015 > 118 > 5 > 829-833

A six-mirrored carousel interferometer has been designed. The technique utilizes Michelson interferometer configuration which consists of six mirrors and a pair of compensating glass plates. Optical path difference generated due to rotation is used to measure angle and axis of rotation. The resultant at the output port of the interferometer is optimized to reduce nonlinearity for different ranges...

article

Analog processing based vibration measurement technique using michelson interferometer

Babar Hussain, Mushtaq Ahmed, Ghazanfar Hussain, Muhammad Saleem, more

Photonic Sensors > 2013 > 3 > 2 > 137-143

A Michelson interferometer based sensor, to monitor the displacement and vibration of a surface, is presented. The interference signals detected in quadrature are processed using analog electronics to find the direction of the motion of a vibrating surface in real-time. The complete instrumentation and signal processing are implemented for the interpretation of the amplitude as well as positive and...

article

Optical fiber displacement sensor and its application to tuning fork response measurement

Feilong Lin, Stuart T. Smith, Ghazanfar Hussain

Precision Engineering > 2012 > 36 > 4 > 620-628

Optical sensors based on a knife edge obstruction represent an inexpensive method for stable, high signal to noise ratio (SNR), variable measurable range, low moving mass, compact size and high bandwidth displacement measurement. Two displacement sensor implementations have been evaluated in terms of noise and sensitivity as a function of the proximity of the knife edge relative to the source. Using...

article

A Facile Route to Heterostructured ZnO:S/ZnO Nanorotors: Structural and Optical Properties

Syed Ghazanfar Hussain, Deming Liu, Xintang Huang, Salamat Ali, more

The Journal of Physical Chemistry C > 2008 > 112 > 30 > 11162 - 11168

article

Lead Content of Petrol and Diesel and its Assessment in an Urban Environment

Pravin P. Parekh, Haider A. Khwaja, Adil R. Khan, Ronaq R. Naqvi, more

Environmental Monitoring and Assessment > 2002 > 74 > 3 > 255-262

Pakistan is one of the few countries in Asia thatcontinues to use only leaded-petrol as vehicular fuel. Theconcentration of Pb in its petrol reported in 1991 was thehighest (1.5 – 2.0 g Pb L^-1) of all produced by the various Asiancountries and far exceeded the WHO’s guideline of 0.15 g Pb L^-1. We have undertaken a study to trace and quantify this toxicelement in the environs of Karachi, Pakistan’s...

article

Ambient air quality of two metropolitan cities of Pakistan and its health implications

Pravin P. Parekh, Haider A. Khwaja, Adil R. Khan, Ronaq R. Naqvi, more

Atmospheric Environment > 2001 > 35 > 34 > 5971-5978

The present study reports findings on TSP loading in the ambient air of two major cities in Pakistan - Karachi and Islamabad. Data for TSP were collected at one site in Karachi and two in Islamabad between 10 December 1998 and 08 January 1999. This article reports one of the highest TSP loadings recorded so far in any megacity of the world. During the study period, average daily TSP concentrations...

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Search results for: Ghazanfar Hussain

A comparison of image processing techniques for optical interference fringe analysis

Large angular range carousel interferometer for spectroscopic applications

Analog processing based vibration measurement technique using michelson interferometer

Optical fiber displacement sensor and its application to tuning fork response measurement

A Facile Route to Heterostructured ZnO:S/ZnO Nanorotors: Structural and Optical Properties

Lead Content of Petrol and Diesel and its Assessment in an Urban Environment

Ambient air quality of two metropolitan cities of Pakistan and its health implications

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