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Fiber Optic Axial and Tilt Sensor

The Institute of Armament Technology (IAT), Pune has successfully developed a FiberFiber Optic Axial and Tilt Sensor
Optic Sensor for measuring axial and angular displacement using multimode fibers and commercially available source and detectors. The sensor offers high resolution angular or tilt measurement in the target position and high resolution Fiber Optic Axial and Tilt Sensor axial displacement. The basic concept is based on fiber optic displacement sensor. The principle is used for an adjacent pair of fiber optic element. One carries the light from a remote source to an object or a target whose displacement or motion is to be measured and the other receives the light and carries it back to a remote photodetector.

The angle positioning system consisting of a precise stepper motor control with drive circuitry and the signal conditioning system form the heart of the sensor system. The function of the angle positioning system is to provide angular rotation to the reflecting surface in discrete steps of the desired angle. The signal conditioning setup consists of a photo-transistor SA-350 to give current output. This output is then passed through a buffer circuitry and further amplified by an op-amp. Balanced intensity configuration is used and common mode rejection is ensured by making the receive system to generate outputs VI and V2 which are given to a difference amplifier to give (VI-V2) output. For the axial displacement sensor, a resolution of 1Ám has been reported by the present setup. However, for the angular sensor, the minimum resolution is limited by the motor's half step angle, which is 0.9. It is observed that the axial displacement range is limited by the range of angular displacement and vice-versa which is in agreement with the theory .The sensor performance for different reflecting surfaces and varying gap between the sensing probes has been studied and found to be consistent. As an extension, it is planned to develop a mathematical model supported by appropriate software to provide direction of rotation in addition to the measurements. Further action is being taken for measuring displacement along more than one axis. Such a System would be very useful for aircraft applications where the rotation of the flap has to be measured very accurately. The sensor would also be useful for vibration studies in motor shafts and other mechanical components.

Spectrafiuor Plus Instrument

The Defence Research & Development Establishment (DRDE), Gwalior, has installed a Spectrafluor Plus Instrument. It is a fully automatic, computer-controlled fluorometer for measuring samples in microplates (1-1536 wells). The instrument fulfills the requirements for several fluorescene, absorbance and glow luminiscence applications in both research and routine investigations. The instrument has no on-board software and is exclusively controlled via an external computer using Windows. Xfluor provides instrument control and data via an external computer using Windows. Xfluor provides instrument control and data acquisition using MX-EXCEL'm .The light source, optics and detectors of the instrument comprise high energy Xenon flash lamp, quartz fibres and lenses, and side window, low dark current photomultiplier tube.

This instrument can measure cell growth, adhesion, and cell viability, etc. in multiwell plates. The metabolic integrity of the cells can be assessed based on various biochemical parameters, following incorporation of suitable fluorescent dyes. This instrument has wide application in in-vitro toxicity studies.

Differential Global Positioning System

The Proof & Experimental Establishment (PXE), Balasore has recently acquired a Differential Global Positioning System (DGPS). The system consists of a base unit and a mobile rover station which can be carried by a single man. With this system, it is now possible to easily determine the coordinates in x-, y- andz-axes of any point within 1 cm accuracy. This will be used to accurately determine ballistic parameters like range, deviation and height of burst of projectiles as well as validating the data of velocity , analyzing long range tracking Doppler radar.

Multi Component Dynamic Adsorption System

A Multi Component Dynamic Adsorption System was recently installed at the Defence Research & Development Establishment (DRDE), Gwalior. The system is microprocessor-based and can monitor several parameters of adsorption studies on various types of materials, including carbons plastic/ polymer material/ composites etc.