Abstract:

Aiming at the disadvantages of contact measurement density instrument, such as detection range limitation, we put forward a kind of non-contact volume measurement method. This method can be used to calculate the density by detecting the inner variation of container air pressure to indirectly measure the non-hollow solid density. A wide range of the measurement, a notable advantage of this device, can nondestructively measure the non-hollow solid matter which does not have chemical reaction with air. This method can also avoid the damage and the error brought by single drainage destruction. Within the range of pressure endurance, the container can increase the pressure of the compressed air chamber by controlling the air compressors properly, improving the measurement accuracy and making the error less than 3% .

Key words: weighing sensor, AD7706, air compressor