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We have recently developed a narrow band imager (NBI) using an air gap basedFabry-P\'erot (FP) interferometer at the Indian Institute of Astrophysics,Bangalore. Narrow band imaging is achieved by using an FP interferometerworking in combination with an order sorting pre-filter. The NBI can be tunedto a different wavelength position on the line profile by changing the plateseparation of the FP. The interferometer has a 50 mm clear aperture with abandpass of $\sim$247.8 m\AA and a free spectral range of $\sim$5.3\AA at$\lambda$ = 656.3 nm. The developed NBI is used to observe the solar filamentin the H$\alpha$ wavelength. The instrument is being used to image the Sun atchromospheric height and it is also able to scan the H$\alpha$ spectral lineprofile at different wavelength positions. We have also made Doppler velocitymaps at chromospheric height by taking the blue and red wing images at $\pm$176m\AA wavelength positions separately away from the line center of the spectralline. In this paper, we present a description of the NBI including lab testresults of individual components and some initial observations carried out withthis instrument.

Fabry-P\'erot based Narrow Band Imager for Solar Filament Observations