Temperature-sensitive device to detect breathing of animals and birds

In many animal experiments it´s very common to anesthetize the animals for a long time. However, the experimenters´ carelessness may lead to the deaths of the experimental animals by suffocation. Especially for those animals of important species or those undergoing long-term experiments and observations, there may be significant losses. Here, a simplified on line monitoring system is presented to transduce the breathing air temperature, which is warmer when exhaling and cooler when inhaling into a corresponding sound. This system will allow the experimenter not to have to give extra attention to breath monitoring, and it can simultaneously measure the physiological parameters of breathing frequency per minute. Besides, if the anesthetized animal stops breathing, the positive/negative saturation signals on the OP-AMP in the system will let an adjustable timer send out a second kind of emergency alarm which is initiated when the breath interval exceeds the safe length, so that first aid can be given in time. In this way, the safety of animal experiments can be enhanced