The invention discloses a lens center thickness measuring device based on double face
confocal measurement. The device is characterized by comprising a controller with a
spectrograph, an optical probe I, a two-dimensional
moving frame, a lens clamp, an optical probe II, a support and a computer. The optical probe I, the two-dimensional
moving frame and the optical probe II are all fixed on the support, the lens clamp is clamped on the two-dimensional
moving frame, the controller is connected with the optical probe I and the optical probe II through optical fibers, the two-dimensional moving frame is located between the two optical probes, and the computer is connected with the controller with the
spectrograph through a data line. The device has the
advantage that 1 each optical probe is only required to detect first peak of return
wavelength, the problem that the false peak is required to be recognized under the condition that a lens is coated by a film is solved, and thickness measurement of the lens coated by the film is achieved; 2 two optical probes are utilized to reduce errors caused by the fact that light enters the lens to be refracted and reflected, and measurement accuracy is improved; 3 the method can be used for thickness measurement of the opaque object allowing double-face reflection, and the measurement range of the
confocal measurement is expanded.