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 inex pensive method for lowering the dissolved oxygen concentration of wate r to levels acceptable for ultrasonic research. Several methods of deg assing water for ultrasonic measurement and operation are available. H owever, 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 circul ating 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 s tandard pump and about ten dollars of hardware supplies.