| 摘要 |
PURPOSE:To enhance the safety of a diving operation by a method wherein the breathing/ discharge coefficient of an inert gas by a breathing operation is stored and the partial pressure of the inert gas inside an actual tissue is computed accurately on the basis of the coefficient. CONSTITUTION:When a safety coefficient K is input through a switch part 20 in a diving operation, the coefficient is written into a RAM 16 only when it is within a prescribed range. When the diving operation is started, water-pressure data which has been detected by means of a water-pressure sensor 17 is input to a CPU 14, and the CPU 14 computes the nitrogen partial pressure of a breathing gas and the depth of water. It is judged whether a floating operation is to take place or not. The half-saturation time to be stored in a ROM 15 is set when the floating operation is not to take place. The nitrogen partial pressure inside a body is computed at each tissue part of a human body. It is compared with a maximum permissible safety limit amount stored in the ROM 15. When the partial pressure is smaller than the limit amount, the nonreduced-pressure diving time is computed. In the floating operation, a value in which the half-saturation time has been divided by the safety coefficient is set as the half-saturation time and the nitrogen partial pressure inside the body is computed. Since the partial pressure of an inert gas inside the tissue of the human body can be computed accurately in this manner, the safety of the diving operation can be enhanced. |
