Using indian galena ore for preparing thermoelectric generator, pressure transducer and solar selective coating

                                         N.B : - Six Indian Patents Sealed

Indian Galena based pressure transducer

Galena Ore (PbS) is a semiconductor material, which is known for its sensitivity to pressure. A galena based pressure transducer, also known as a galena based pressure sensor, is a pressure – measuring device that utilizes galena (lead sulfide, PbS) as its pressure – sensitive element. These transducers are used to detect and measure pressure changes, converting them into a measurable electrical signal. Galena’s properties can be affected by temperature, so temperature compensation may be needed in some application.The durability and reliability of the galena crystal and the overall transducer design are important factors for long term use.The pressure to be measured is applied to a diaphragm or similar element within the transducer. The Galena crystal is placed in contact with the diaphragm. When pressure is applied, it causes a change in the electrical resistance of the galena.The change in resistance is converted into a proportional electrical signal, typically a voltage or current, using a Wheatstone bridge circuit or similar configuration. This electrical signal is then measured by an electronic circuit, allowing for the quantification of the applied pressure.

N.B : - Four Indian Patents sealed

Indian Galena Based Solar Selective Coating

The main thrust of our research is to prepare a low-cost solar-selective absorber from an indigenous semiconducting mineral, galena (galena aggregate and galena concentrate), for a solar thermoelectric generator. We report the results of preparation and characterization of solar-selective coatings made from galena aggregate and galena concentrate collected from the Zawar mines in Rajasthan, India. The coatings of galena are prepared by a thermal evaporation technique and exhibit high absorptivity (α~0.95 and 0.97) in the solar spectral range and low emissivity (ε 375~0.21 and 0.27) in the thermal range. Finally, these coatings were compared with synthesized PbS coating prepared in our laboratory and found to be quite comparable. The structure and composition of the coatings were studied by x-ray diffraction and electron spectroscopy for chemical analysis. Reflectance and absorption studies were made in the 0.3- to 3.1-μm spectral range.

N.B : - Published in “Journal optical Engineering”, Vol 32, Issue 11, November 1993.

Prof. Shuchitangshu Chatterjee is presently Vice Chancellor of RKDF University, Ranchi, Jharkhand, India. Dr. Shuchitangshu Chatterjee is a product of distinguished institute Indian Institute of Technology, Kharagpur. He has the area of thermoelectric & allied field. He has academic as well as industrial & defence sector experience in his field and allied areas. He has given his exemplary service to the highly recognized company, MECON Ltd. Ranchi. After giving 31 years of service at MECON, he superannuated as The General Manager (Research Development and Product Development). He has/ had widely traveled around the world on official assignments. He has 18 Patents & more than 86 Publications at International & National Level. He is guiding Ph.D. thesis.