Polarized-light linear displacement sensor

Abstract

Wide-range linear displacement sensor with using polarized light includes linearization and continuous circuits, two sets of round wheel with their radius being same or different, two sets of mechanical transforming devices for driving said round wheels. Each set, i.e. polarized light detection system, consists of illuminant component, polarizer, analyzer and photoelectric receiving unit. The measured displacement causes rotation of said two or four wheels, therefor the polarizer or analyzer making rotation with same angle. The two output ends of photoelectric unit are connected to linearization and continuous circuits respectively whose outputs are the outputs of measuring system. Since two sets of mechanical devices are used alternately so as to provide wider measuring range. When measuring absolute position, a mechanical and polarized light measuring system is additionally equipped, which system is with high ratio of linear displacement and angle displacement.

Description

technical field [0001] The invention relates to a metering device characterized by an optical method, and is a sensor for measuring large-scale linear displacement based on a polarized light detection method. Background technique [0002] Linear displacement or angular displacement is a basic physical quantity, and displacement sensors are widely used in scientific research and industrial applications. However, there are not many types of existing displacement sensors that can be applied to large-scale measurement. Examples include grating sensors (grating, magnetic grating, capacitive grating, etc.), photoelectric encoders, and Wiedemann effect sensors. Usually their manufacturing process and use and maintenance are more complicated, and the cost is higher. For example, the grating displacement sensor has high requirements on the environment; the secondary circuit part of the Wiedemann effect displacement sensor is complex, and the primary sensing...

AI Technical Summary

Problems solved by technology

Usually their manufacturing process and use and maintenance are more complicated, and the cost is higher

For example, the grating displacement sensor has high requirements on the environment; the secondary circuit part of the Wiedemann effect displacement sensor is complex, and the primary sensing part requires special steel, etc.

Especially for the measurement of large-scale absolute position, it is often difficult to achieve or to pay a large price

Polarized light displacement sensor has the characteristics of non-contact sensing, simple structure and low price, but the existing measurement schemes are not suitable for large-scale displacement, especially the measurement of absolute position and large-scale displacement

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