研究目的
Investigating the design and performance of a low-cost, simple optical tilt sensor based on the principle of Snell’s law of refraction and reflection.
研究成果
The proposed optical inclination sensor is simple, inexpensive, and free from toxic material, with a linear measuring range up to ±20° and better static characteristics. It exhibits good sensitivity (225mv/°) and resolution (0.02°) compared to prior art. Future directions include extending the measured range by implementing a look-up table in other non-linear regions or using an array of photodetectors.
研究不足
The error is correlated with the misalignment of the light source and photodiode. Liquid sloshing in the container may disturb the stability of the sensor output. The influence of ambient lights requires opaque sensor housing.
1：Experimental Design and Method Selection:
The sensor design involves a transparent, cube-shaped container made of acrylic sheet, half-filled with water, and equipped with two pairs of optical trans-receivers to sense the liquid column inclination. The working principle is based on Snell’s law of refraction and reflection.
2：Sample Selection and Data Sources:
The sensor body is designed for a transmission angle of 50°, with technical details of each element provided.
3：List of Experimental Equipment and Materials:
Includes a cube-shaped container, light emitting diodes (LEDs) with a wavelength of 640nm, BPW34 photodiodes, and a signal processing circuit (SPC) unit.
4：Experimental Procedures and Operational Workflow:
The sensor body is inclined in clockwise and anti-clockwise directions with an angular interval of 5°, and the response of photodiodes is recorded for individual optical sources.
5：Data Analysis Methods:
The output response of photodiodes is analyzed to determine the relationship between sensor outputs and tilt angle, with linear regression applied to select appropriate linearity and sensitivity.
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