| 摘要 |
PURPOSE:To measure the total protein density of serum simply in a short time by measuring the ultrasonic propagation speed and temperature thereof. CONSTITUTION:An ultrasonic circuit is made up of a sing around circuit 8. An ultrasonic pulse wave is transmitted into serum 1 from an ultrasonic transmitter/receiver 4, reflected on a passive reflector 3 and received again with the ultrasonic transmitter/receiver 4. As a result, the ultrasonic propagation speed V of the serum 1 is calculated and enters a CPU12 passing through a gate circuit 11. The temperature T of the serum is measured with a temperature sensor 5 to be converted into a digital signal with an A/D converter circuit 10 and enters the CPU12 passing through the gate circuit 11. A memory circuit 13 memorizes the constant of the function F (T, V) for determining the total protein density of the serum from the temperature T and the ultrasonic speed V of the serum. The function F is, for example, a polynomial of multiple degrees of a formula and the constant ai is the one previously determined from the relationship with the protein density of serum. The results of computation of the function F is shown on a display circuit 15. |
