Method for welding vibration-resistant and high-temperature-resistant photomultiplier package voltage division circuit for petroleum logging

Abstract

The invention relates to a method for welding a vibration-resistant and high-temperature-resistant photomultiplier package voltage division circuit for petroleum logging. The method comprises the following steps that firstly, the temperature of a used soldering iron is adjusted by using a thermodetector; afterwards, a soldering bit is used for preheating the position without devices and wires on a voltage division circuit board; and finally, a soldering bit point is placed on a bonding pad, and tin is evenly fed to the connecting point of a tube pin and the bonding pad for welding. According to the method, soldering tin can smoothly pass through the through hole bonding pad on the circuit board, is uniformly distributed at the two sides of through holes and is welded with the tube pin, so that the firmness degree of the tube pin and the voltage division circuit board is improved, and the use performance of a photomultiplier in a high-temperature and vibration severe environment of petroleum logging is effectively ensured.

Description

technical field [0001] The invention relates to a welding method for external packaging of a photoelectric vacuum device, more precisely, a welding method for packaging a voltage dividing circuit of a petroleum logging anti-vibration and high-temperature resistant photomultiplier tube. Background technique [0002] In order to make the photomultiplier tube work, a high voltage of about 500~3000V is applied between the cathode and the anode, and at the same time, it is supplied to the photoelectron focusing electrode, multiplier system or different types of accelerating electrodes. The voltage divider packaged by the photomultiplier tube mainly supplies power to each electrode of the photomultiplier tube through each tube pin. [0003] Vibration-resistant and high-temperature-resistant photomultiplier tube packaging is mainly used in oil logging or geological exploration in harsh environments. It has extremely high requirements for the welding firmness between the tube needle...

AI Technical Summary

Problems solved by technology

However, due to the high temperature of the soldering iron, the local heating of the circuit board is too high, resulting in a phenomenon that the circuit board bursts, which is not easy to identify with the naked eye; another phenomenon is that the contact part of the tube needle and the solder joint is oxidized severely during the soldering process. Even cause the pad to fall off

Due to the high temperature of the soldering iron, the uneven heating will cause the dark noise of the entire photomultiplier tube package to increase during use, which will affect the overall performance of the product

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