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Authors present a novel method in position sensing based on the diffraction of Gaussian beams, their propagation properties and their spatial modulation . The idea is to focus two modulated and collimated Gaussian beams into a slit. The resulting diffracted beams at the slit illuminate a photodetector whose signal is demodulated by a lock-in amplifier. The response of the lock-in amplifier is a function...
Since the beginning of the development in spring 2005, considerable progress has been made on the BIPM watt balance. We have continued the development of a room temperature experiment to test the feasibility of simultaneous force and velocity measurements. We are now able to simultaneously acquire the velocity and voltage of the moving coil and to deduce their ratio. This article briefly recalls the...
We describe a mass comparison system in which a test mass artifact in air can be directly compared to a standard mass artifact in vacuum using the same high precision comparator balance. The system uses a magnetic levitation technique to couple the weighing pan of the comparator balance in vacuum to the test mass in air. We will discuss motivation, design considerations, and preliminary results.
This paper describes the main progress on the LNE watt balance project since 2004. Development of different parts and structure of the watt balance including starting their assembly are presented.
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