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Log diameter measurement with light sources and camera in the harvester head of a tree harvester

IP.com Disclosure Number: IPCOM000247588D
Publication Date: 2016-Sep-19
Document File: 2 page(s) / 19K

Publishing Venue

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Title:   

Log diameter measurement with light sources and camera in the harvester head of a tree harvester

Description:

This is about measuring the diameter of logs using bright visible light with small focus spot (For example laser in the picture) and an equipment taking pictures (For example video camera in the picture). Log diameter measurement in harvester heads can be done in many different ways. The most common way is to have angle sensors placed to swivel of the harvester head forks. This kind of sensor has to be robust and withstand extreme operating conditions. Other ways are known from Optofidelity (http://www.optofidelity.com, EP 2 489 978, FI 119218 (Ultrasound wave) or US5949086).

The way of measurement described here is more accurate and there are no mechanically wearing parts. Measurement is done using two light sources with a small focus spot and an equipment taking pictures. The light sources can be for example red LEDs or laser diodes. The equipment which takes the pictures can be for example a video camera or a camera capable to take still pictures. The Light sources are in an angle so that small and big log diameter can be calculated from the picture. For example, the light source can be aligned to the radius of the log if the harvester head structure allows the installation exactly in the radius direction.  Two light sources are used to enable easy calibration and for redundancy. In some cases there is no need for this and the system can be done with...