Monitor body temperature detection NTC probe

　　Humans are constant-temperature creatures, and body temperature is an important indicator for understanding the state of life in medicine. Temperature not only reflects the results of the body's metabolism, but is also one of the conditions for normal functional activities. The NTC temperature sensor (probe) is widely used in the detection of body temperature, and the medical monitor is one of the instruments containing the NTC probe. Through various types of sensors, important parameters such as ECG, heart rate, blood oxygen, blood pressure, body temperature and other important parameters of the human body can be detected in real time, and the supervision, alarm, storage and transmission of various physiological information can be realized. important equipment.

　　In the process of human body temperature measurement, the multi-parameter monitor first applies the normal working voltage Vcc to the body temperature probe (body temperature sensor), the body temperature probe (body temperature sensor) RT is generally placed on the upper bias circuit of the circuit, and a fixed R2 resistor is connected in parallel , the lower bias R1 is a fixed resistor. When the temperature changes, the resistance of the body temperature probe changes, and the sampling voltage Vout changes in the input voltage of AD identification and conversion. In the A/D identification and conversion circuit, the changed input voltage and the entered temperature and resistance value R-T table The corresponding voltage is identified, and the digital signal corresponding to the temperature change is output, which is identified by decoding, and then driven by the LCD amplification and driving circuit to drive the LCD to display the temperature.

　　NTC thermistors are located in the temperature probes of medical monitors. Body temperature probes are generally divided into two types: body surface probes and body cavity probes. As an important accessory in the medical monitor, the body temperature probe must continuously monitor the physiological parameters of the patient for 24 hours to ensure the comfort of the patient during use. Therefore, as the core temperature measuring element in the body temperature probe, the NTC thermistor must be Has the following characteristics:

　　1. High reliability, high stability, high precision

　　2. Small size, high sensitivity and fast response

　　3. Good thermal cycle capability

　　4. Interchangeability, good consistency

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