Laser-method vacuum tube vacuum degree nondestructive test method

Abstract

The invention belongs to the technical field of an electric power nondestructive test, and specifically relates to a laser-method vacuum tube vacuum degree nondestructive test method, mainly for solving the problems of time-consuming and labor-consuming conventional vacuum degree detection methods and inaccurate measurement in the prior art. The method comprises the following steps: 1, adjusting a laser; 2, determining a set angle, i.e., driving a measuring arm to rotate by use of a stepping motor, installing a photoelectric tube, which is used for detecting and measuring reflection light irradiated by a laser generator on vacuum bubble, on the measuring arm, when the maximum value of the reflection light is detected by the photoelectric tube, starting counting pulses of the stepping motor, and according to the number of the pulses, and obtaining a rotating angle of the measuring arm through conversion, i.e., the set angle; 3, replacing the vacuum bubbles in the second step with vacuum bubbles to be detected, repeating the second step, and obtaining a measuring angle; and 4, according to the formula that a deviation angle=the measuring angle-the set angle, when the deviation angle is positive, it indicating that the vacuum in a vacuum chamber is decreased, and when the deviation angle is negative, it indicating that the vacuum in the vacuum chamber is good.

Description

technical field [0001] The invention belongs to the technical field of electric power non-destructive testing and electric power instruments and meters, and in particular relates to a method for non-destructive testing of the vacuum degree of a vacuum tube by a laser method. Background technique [0002] The vacuum degree of the vacuum interrupter is an important technical index of the electric vacuum switch. When the vacuum degree is lower than 1.33X10-5, the vacuum interrupter needs to be replaced, otherwise it will cause an accident. For a long time, there has been a problem of difficulty in detecting the vacuum degree. The public method is to remove the vacuum interrupter, apply a voltage at both ends of the contacts, and judge the vacuum degree in the chamber by measuring the ion current. This method is time-consuming and laborious, and the measurement is inaccurate, often misjudgment. Contents of the invention [0003] The invention mainly aims at the problems of ti...