Fig. 4
From: In vivo characterisation of field pea stem wall thickness using optical coherence tomography
Procedure used for refractive index measurements. (i) An excised stem is cut in half along the black dashed line. (ii) One half of the stem sample is imaged using OCT. The OCT scan direction is indicated by the red dashed line. (iii) A B-scan acquired along the red dashed line in (ii). The physical thickness (D2) and the optical thickness (D1) of the stem tissue are measured to calculate the refractive index