Polarized-light linear displacement sensor

A linear displacement, polarized light technology, applied in instruments, optical devices, measuring devices, etc., can solve the problems of high cost, high environmental requirements of grating displacement sensors, complicated manufacturing process and maintenance, and achieve long service life, operation and maintenance. reliable results

Inactive Publication Date: 2004-09-22
ZHEJIANG UNIV
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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

Method used

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  • Polarized-light linear displacement sensor
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  • Polarized-light linear displacement sensor

Examples

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Embodiment Construction

[0029] As shown in Figure 1, in two polarized light detection systems, there is a definite relationship between the angle between the polarizer and the transmission axis of the analyzer and the light intensity passing through the analyzer, that is, Marius' law , when θ 1 with theta 2 When the difference is preset to 45°, the working area of ​​one cycle can be obtained as shown by the thick line.

[0030] Such as figure 2 As shown, the mechanical conversion device includes a set of round wheels 11 with the same radius and equipped with a polarizer 10 and a round wheel 2 with a polarizer 12 arranged symmetrically to the light-emitting element 3 on the left and right; the same radius is equipped with a polarizer The round wheel 8 of 9, the round wheel 5 that polarizer 7 is housed, a transmission part 4 that can drive round wheel 11 and round wheel 8 to rotate simultaneously. Polarized light detection system: including a light-emitting element 3, two sets of polarizers 10, 9, t...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B9/02G01B11/02G01B11/26G01B21/02
Inventor 李伟
Owner ZHEJIANG UNIV
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