An International Peer Reviewed Research Journal
Frequency : Monthly,
ISSN : 0971 – 3093
Editor-In-Chief (Hon.) :
Dr. V.K. Rastogi
e-mail:[email protected]
[email protected]

 AJP ISSN : 0971 – 3093
Vol 10, No 3, July – September, 2001

Journal of Physics

Vol 10, No 3, July – September, 2001


Asian Journal of Physics

Vol 10, No 3 (2001) 303-454

(An International Quarterly Research Journal of Physics)
(A Non-Profitable Registered Publication)



Quantum mechanics on a lattice

F T Lee


Monitoring of ozone, water vapour etc during the voyage to Antarctica

S L Jain


Investigations on atmospheric humidity profile at varying oxygen levels with a laser based monitoring system

D Das, G A Ahmad, G K D Mazumdar and A Choudhury


Experimental study of 2D turbulence in soap films

K Pal and S Chopra


The electronic absorption spectra of four disubstituted phenols

R Kanna Rao, A Srinivasa Rao and D V Krishna Rao


Study of microstrip antennas using different materials

S N Mulgi, R M Vani, P V Hunagund and Sara Fatima Farida


Lattice dynamics of TAC and HFC using three-body force shell model

S Mohan and K Sonamuthu


Phase transitions in solid solutions of alloy semiconductors : Ga1-x, InxSb and Ga1-x InxP

Sadhna Singh


Latitudinal dependence of solar wind speed and the sunspot cycle

T E Girish and G Gopkumar


A non linear impurity in two-dimensional systems

R S Roy


Comparative study of Forbush decrease with geomagnetic storm sudden commencement

P L Verma and S K Nigam


High frequency dielectric behaviour of erbium substituted Ni-Zn ferrites

K Vijaya Kumar and D Ravinder


Relationship among various interplanetary indices during maximum and minimum solar activity

G N Singh and Pankaj Kumar Shrivastava


A relation between cosmic rays and Dst field

M Lal and Pankaj K Srivastava


Studies on coronal mass ejections classified according to their speeds

T K Das and MK Ghosh


Influence of pressure on cosmic ray intensity at neutron monitor energies.

G.N Singh and Pankaj Kumar Srivastava


On the crystallographic aspects of some naturally occurring simple and furano coumarins

Rajnikant, V K Gupta, Dinesh and Mousmi Bhat


Single crystal growth and X-ray crystallograhphic analysis of some 4, 4'-substituted biphenyls

Rajnikant, V K Gupta, A Kumar, R Gupta, A Kumar, Dinesh and Ashu Sawhney


Conformational analysis of some steroidal molecules

Rajnikant, V K Gupta, Dinesh and Mousmi Bhat


Thermal and FTIR spectroscopic studies of aspirin single crystal

Sanjay P Vachhani, R M Dabhi and M J Joshi



Vol 10, No 3 (2001)323-330

Investigations on atmospheric humidity profile at varying oxygen levels with

a laser based monitoring system


D Das1, G A Ahmed2, G K D Mazumder3 and A Choudhury4

1Department of Physics, North Gauhati College, 781031, Assam, India

2Department of Physics, Tezpur University 784028, Assam, India.

3USIC, Gauhati University, 781014, Assam, India.

4Department of Physics, Tezpur University, 784028, Assam, India

[email protected]; [email protected]

A laser based Air Quality Monitoring system was designed and fabricated in an attempt to synthesize design principles of a nephelometer and a transmissiometer and monitor specific constituents of the atmosphere. Essentially in the system light from a He-Ne laser source passes through a simulation chamber and the extinction and scattering is monitored by a set of phototransistor based detectors. The signals from the detectors are digitized and interfaced to a personal computer, where a data acquisition software "moniotors" and records the data which is subsequently analyzed using spreadsheet programs. This paper reports the design aspects of the fabricated instrument and gives the findings of investigations done on atmospheric humidity at varying oxygen levels. ©Anita Publications. All rights reserved.


1. Ahmed G A, Mazumder G K D, Choudhary A, J Instrument Sot India, 26 (1996) 734.

2. Pritchard B S. Elliott W G, J Opt Soc Am, 50 (1960) 191.

3. Jonasz M. Appl Opt, 29, (1990) 64.

4. Hinkley E D, Laser monitoring of the atmosphere, (Springer – Verlag, Berlin), 1976, p 62.

[Received : 12.3.2001]