| 摘要 |
PROBLEM TO BE SOLVED: To accurately obtain the concn., density or sp.gr. of a processing soln. SOLUTION: The treating amt. of negative film is fetched 112, a map showing the relationship between the propagation velocity of an ultrasonic wave in a processing soln. corresponding to the amt. above and the sp.gr. of the soln. is selected 114, the propagation velocity of the ultrasonic wave in the soln. is obtained 116 from the time the ultrasonic wave is oscillated until the ultrasonic wave is received by a receiver, and the sp.gr of the soln. is calculated 118 from the obtained propagation velocity and selected map. |
