Linear Laser Scanner
The Linear Laser Scanner is a non-contact measurement device capable of acquiring the cross-sectional shape and area of biological specimen undergoing mechanical testing.
The system is composed by two CCD laser reflectance devices mounted, facing each other, on two horizontal linear guides where they can be manually and synchronously slid to sweep, with their laser beams, a measuring zone of about 10 cm. The specimen is vertically placed in the measuring zone, so that the lasers can measure the distance between the specimen surface and themselves when sweeping the entire measuring range; the measure is thus not affected by the specimen not being perfectly centered. The lasers horizontal position along the horizontal guides is measured with a string potentiometer and the two lasers are synchronized with a U shaped aluminium plate, so the shape of the specimen cross-sectional shape can be easily acquired. Cross-sectional area can then be calculated with any integration method adapted to the data.
Learn more with the original article "A Linear Laser Scanner to Measure Cross-Sectional Shape and Area of Biological Specimens During Mechanical Testing", published in Journal of Biomechanical Engineering.
Photo courtesy of the Laboratoire de Biomécanique et Pathologie Locomotrice du Cheval