Breathing amplitude detection system, method, and computer program based on micro force detection

A breathing amplitude detection system based on micro force detection, characterized in that the breathing amplitude detection system includes a sensor, a processor, a sensor power supply circuit, an operational amplifier, and a feedback resistor, characterized in that:

• the sensor is a small force detection sensor, which is connectable to a user and sense the amplitude of the user's breathing movement;
• the sensor power supply circuit is connected to the first terminal of the sensor and provides a reference voltage to the sensor;
• the second terminal of the sensor and the first terminal of the feedback resistor are connected to the first input terminal of the operational amplifier;
• the second terminal of the feedback resistor is connected to the output terminal of the operational amplifier;
• the output of the operational amplifier is connected to the processor for transmitting a measured voltage;
• the processor maps the measured voltages to discrete voltage values;
• the processor calculates the amplitude of the user's breathing movement based on an absolute value of a derivative of the discrete voltage values with respect to time;
• when the amplitude of the breathing movement is lower than a preset threshold, the processor controls to issue an alarm signal.