Abstract: The ranging device includes a clock generator, a light emitter, a light sensor, and a ranging control circuit. The clock generator outputs a reference clock signal. The light emitter generates an emitted light signal modulated by the reference clock signal and emits the emitted light signal to an object. The light sensor receives a reflected light signal reflected from the object to generate a light sensing signal. The ranging control circuit includes a variable delay line. The ranging control circuit receives the reference clock signal and the light sensing signal, and generates a ranging signal accordingly to track an energy characteristic point of the light sensing signal.

Abstract: An earthquake simulating vibration table includes a vibration machine having a vibration table provided on the topside. Paper models are assembled on a model fundamental base that is fixed on the vibration table. The vibration machine is controlled by a computer to produce simulated various-degree earthquakes. A test of anti-seismic strength of the paper models begins with a smallest seismic strength and then the seismic strength increases by degrees until it reaches to a largest level to have all the paper models collapse. The earthquake simulating vibration table is convenient and quick in assembling, economical in cost and able to be popularized to schools to serve as a course of vibration resistance education to elevate students' learning interest.

Abstract: An earthquake simulating vibration table includes a vibration machine having a vibration table provided on the topside. Paper models are assembled on a model fundamental base that is fixed on the vibration table. The vibration machine is controlled by a computer to produce simulated various-degree earthquakes. A test of anti-seismic strength of the paper models begins with a smallest seismic strength and then the seismic strength increases by degrees until it reaches to a largest level to have all the paper models collapse. The earthquake simulating vibration table is convenient and quick in assembling, economical in cost and able to be popularized to schools to serve as a course of vibration resistance education to elevate students' learning interest.