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Photoelectric inclination sensor and its application to the measurement of the shapes of 3D objects

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5 Author(s)
Kato, Hisao ; Nagoya Municipal Ind. Res. Inst., Japan ; Kojima, Masahiko ; Gattoh, M. ; Okumura, Y.
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A method for obtaining the tilt angle and direction in a two-dimensional plane, by using a photoelectric inclination sensor consisting of an LED, a hemispherical spirit level, and a photodiode array is explained. An application of the sensor to the measurement of the shape of a 3-D object is also described. Light from the LED projects a bubble in the spirit level and throws a shadow onto the surface of an array composed of four equivalent p-n junction diodes, isolated from each other by a cross on a wafer. The tilt angle and direction in a two-dimensional plane are obtained by combining the diode outputs. By positioning the sensor on the crosspoints of the lines drawn longitudinally and latitudinally at an interval on the surface of a small mountain in a Japanese garden, the x and y components of the tilt angle can be obtained and its shape is reconstructed by a computer. The principle of the sensor, the system to display the tilt angle and its x and y components, and the application of the system to the measurement of the shape of a mountain are explained

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Instrumentation and Measurement, IEEE Transactions on  (Volume:40 ,  Issue: 6 )