We have developed the ultrasonic spirometer for monitoring of breathing regime in various reviving and sustaining apparatuses as respirator and artificial lungs including testing and control systems. This device can also be used for the performance of similar applications in medical equipment. The device is based on the new physical principle. The electronics fulfilled with the usage of US element base.
This characteristics belong to certain modification of device. If needed they may be adjusted as required.
We'll great your collaboration in father development and marketing of the device.
The main principle of measuring is the excitation of ultrasonic vibration in the air-gas mixture moving through the measuring conduit and the reception of these vibration by a piezoelectric receiver. The comparison of the phases of the radiated and the received vibrations provides the momentary rate of flow. The main feature of the above method is the immediate introduction of vibration into the measured medium without reflecting/refracting surfaces and sound conductors
As a rule, the actual time of protective action exceeds the guaranteed one for 20 % and more that results in partial use of a resource of protective action of a vehicle and has negative effect upon tactics of mine rescue works. At the same time, measuring the charge and volume of breathed out air past through regenerating cartridge, one can find the resource of protective time developing the acoustic means of measurement of the quantities of a air-gas mixture in pulsating flows, and, in particular, creating the primary sensor. We took into account features of acoustic measurements of the flow rates in gases. In this connection it was necessary to decide a number of problems, namely:
1. To receive the high ratio of signal / noise ( not less than 20 Db ) at reasonably small significance of a excitation voltage of the electro-acoustic radiator.
2. To carry out experimental research to compare the phase and temporary methods of measurements with reference to a particular primary measuring converter.
3. To investigate influence of the various destabilizing factors of a controllable gas mixture upon the sound speed, and consequently on a measuring range.
