Seedling Diameter Measurement With Application Of Infrared

Aini , Ahmad (2009) Seedling Diameter Measurement With Application Of Infrared. Project Report. UTeM, Melaka,Malaysia. (Submitted)

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Abstract

This project eventually developed a device in measurement of seedling. The project’s aims are to develop an alternative device to measuring the seedling with more accurate and practical. Traditionally, measurement of seedling still in convention way which manually using a slide micrometer and recorded on paper. Here the diameter was obtained using the timing information generated by the shadow of an object passing a pair of receivers. The optical measurement circuit consists of sensor, signal conditioning and data acquisition system. Sensor fixture is designed based on an optical time-of-flight principle. Signal is transmitted from transmitter to the receiver and analog signal generated by sensor circuit will be converted to digital by using PIC Microcontroller. Serial communication is used to interface the digital signal to computer. The sensor detects the attenuation of light for the optical system. Diameter, D of seedling can be expressed in terms of the corresponding interruption times. Prototype circuit been implemented for optical measurement system. Visual Basic is sued as interface to measure the diameter. The data is collected using data acquisition system and it was offline process. This device can reduced damaged since it will not practically touch the seed itself. On practically, devices were tested using cylindrical objects with known diameters.

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