Figure 1
From: Minimally Invasive Micro-Indentation: mapping tissue mechanics at the tip of an 18G needle
Sketches and microscope images of the optical force transducer used at the tip of the MIMI indenter. (A) Schematic model of the probe, which consists of a cantilever indentation spring (gold), an optical fiber for the interferometric readout of the displacement of the cantilever (red), and a borosilicate sphere to create a spherical contact with the indented surface (blue). The inset shows a schematic of the indentation procedure, where emphasis is put on the interferometric readout and the movement of the piezoelectric transducer (not-to-scale); (B) Microscope image of the probe, showing the interferometric cavity; (C) Top view of the sensor.
