We present optical methods for contactless measurement of two plant parameters that are relevant for e.g. tomato growth: ‘head thickness’ (the thickness of the stem about 30 cm below the top), and leaf area index (LAI, the leaf area per unit ground area). For LAI a 3D camera is exploited. First results show that leaf area can be determined with an uncertainty <8% under laboratory conditions with would be sufficiently accurate. For head thickness an optical caliper based on a laser and a line array has been developed, showing an uncertainty well below the required 0.1 mm.
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