Patent ID: 8462326

Claim:
A Schlieren type ultrasonic wave observer system having a 2-fold focus beam expander, comprising: a continuous wave laser; a computer; a microcontroller integrated circuit; a signal generator; an amplifier; a focusing type ultrasonic wave, wherein the computer connects the microcontroller integrated circuit, the signal generator, the amplifier, and the focusing type ultrasonic wave in order to produce an ultrasonic wave source, the microcontroller integrated circuit connecting the continuous wave laser to activate the continuous wave laser directly, the computer activating the microcontroller integrated circuit, and the microcontroller integrated circuit activating the signal generator and sending a signal to the amplifier for controlling the focusing ultrasonic wave; a decay lens; an objective lens; a pinhole; a reflector and a spectroscope to form a 2-fold focus (2F) beam expander; a water tank, wherein the water tank includes a quartz glass with a 45° angle; an optical lens; and a charge-coupled device, wherein the microcontroller integrated circuit transmits the signal to the computer in order to control a photographing time of the charge-coupled device after a light beam is emitted from the continuous wave laser, the light beam becoming a parallel light by passing through the decay lens and the plano-convex lens, the parallel light entering the beam expander through the pinhole including the objective lens and the pinhole, the beam expander expanding the parallel light into an approximate 5-cm parallel optical field after the parallel optical field passes through the spectroscope of the beam expander, the light beam being dispersed into a piercing parallel light beam and a reflecting parallel light beam after the piercing parallel optical field is reflected by the reflector of the beam expander, the light beam being parallel to a previous reflecting parallel light beam, both light sources being tangent without overlap and forming an inverse “8” shape optical field in the water tank, the inverse 8 shape optical field piercing through the water tank, and the collected image being converged by the plano-convex lens on the charge-coupled device, and sent to the computer for display.