title: Measurement of the position and displacement of a light beam with a spiral scanner.
abstract: A rotating spiral scanner interrupts an incident light beam for time intervals which are proportional to the position of the beam. This produces an electrical signal via a photodetector system which is independent of beam intensity. The device was used to measure the relative change in sarcomere spacing during the initial development of tension in a contracting frog sartorius muscle.
authors.affiliation: Departments of Physics, Engineering Physics, and Anatomy, The University of British Columbia, Vancouver, B. C., Canada.
authors.forename: B
authors.initials: B
authors.lastname: Ahlborn
authors.forename: D
authors.initials: D
authors.lastname: Dean
authors.forename: B H
authors.initials: BH
authors.lastname: Bressler