A cost effective degassing system for use in ultrasonic measurements: The multiple pinhole degassing system

The multiple pinhole degassing (MPD) system discussed below is an inexpensive method for lowering the dissolved oxygen concentration of water to levels acceptable for ultrasonic research. Several methods of degassing water for ultrasonic measurement and operation are available. However, many of these degassing systems are expensive to purchase and are complex, sometimes requiring considerable maintenance. The system described here is ideal for degassing large volumes of water in circulating applications. It degasses 80 liters of water to below 4 ppm O-2 in 5 h and to about 2 ppm O-2 in 24 h. It also enables easy collection of removed gases. At the time of this writing the system requires a standard pump and about ten dollars of hardware supplies.