T shaped pipe elbow is manufactured by the manufacturer. It is a device to increase the residence time of free atom vapor in the beam in absorption spectrum analysis. Made of quartz tube, the main pipe is 100-120mm long, the outer diameter is 12mm, and the inner diameter is 10mm; the branch pipe is 100mm long, the outer diameter is 8mm, and the inner diameter is 6mm. The light beam passes through the main pipe, and the gaseous sample passes through the branch pipe. Heat with flame or electric heating wire. It is mostly used in gas phase hydride atomization method.
When the flow rate is constant, the fluid passing through the reducing pipe (contracts first and then expands) will form a relatively large negative pressure at the smallest diameter of the pipe. (The fluid mechanics has a detailed description) If a hole is opened at this position to connect a pipe, then the end of the pipe will also form a negative pressure. Therefore, the gas can be extracted through the flow of water.