The utility model relates to an electronic device for helping blind walking and discriminating obstacles, which is worn on a head of a user. The utility model comprises an ultrasonic emission sensor, two ultrasonic receiving sensors, a control circuit which can generate ultrasonic signals, receive u.....
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The present invention provides an optical fiber having the gas laser and the laser optical fiber ring laser gyroscopes. The optical fiber comprises a gas laser excitation gas, the excitation source and the optical cavity, characterized in that the optical cavity by the hollow fiber and single mode f.....
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Ultrasonic welding apparatus comprises a sensor ultrasonic welding apparatus and an ultrasonic transducer shaped piezoelectric material between the sensor output of at least two different welding parameters to measure, in order to select the output signal of the welding Parameters have a better sign.....
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