Refraction experimental device null of the optical path by the vapor formation which has

摘要

PURPOSE:To enable visnal inspection for the bending of an optical path due to a temperature difference in air by providing a heating tube body at the upper part of a tube body provided with a light guide-out window and also providing a cooling tube body opposite at the lower part of the tube body, and providing a light source which emits light into the tube body. CONSTITUTION:The heating tube body A is provided at the upper part of the tube body C which is provided with a light guide-in window D where light is made incident at one end and the light guide-out window W where light is guided out at the other end, and the cooling tube body B is provided at the lower part of the tube body. Then the light source K which emits light into the tube body C is provided from outside the tube body C. For example, high-temperature steam C is sent in the heating tube body A provided at the upper side of the tube body C and cooling water W is run through the cooling tube body B provided opposite on the lower side of the tube body C to form a high-temperature side and a low- temperature side in the vertical direction of gas H in the tube C, thereby generating the density gradient in the vertical direction of the gas H. When the light source K emits the light through the light guide-in window D in this state, the high-temperature side and low- temperature side differ in refractive index, so the emitted light is refracted and emitted from the light guide-out window E. This emitted light is projected on a screen, etc., to measure the extent of refraction quantitatively.