Body temperature is one of the most direct indicators of human health. From ancient times to the present, body temperature allows us to intuitively judge a person's health status. Medical temperature sensors make this ancient wisdom shine even brighter in the field of modern medicine. This article will provide you with a detailed introduction to medical temperature sensors.
Medical temperature sensors mainly include disposable medical temperature sensors, ablation application sensors, and forehead thermometer application sensors.
Disposable medical temperature sensors primarily use NTC thermistors. An NTC thermistor is a type of thermal semiconductor resistor whose resistance decreases as the temperature rises. The resistance temperature coefficient is about 10 times that of a metal resistor. The change in the resistance of the NTC thermistor can be caused by changes in the external environment temperature or by self-heating due to current flowing through it.
Ablation application temperature sensors primarily use thermocouple resistors. The working principle of a thermocouple is formed by connecting two different metals to create a sensing junction. When there is a temperature difference between the sensing junction and the free ends, the thermocouple will generate a voltage between the two wires. This voltage signal can be converted into a temperature reading.
Forehead and ear thermometer application sensors primarily use thermopile technology. Infrared thermometers with thermopile probes measure the radiation energy emitted by an object. According to the Stephan-Boltzmann law, the greater the radiation energy, the higher the temperature of the object. This infrared radiation signal is converted into an electrical signal, which is then amplified and processed by signal processing circuits and corrected according to a specific algorithm and target emissivity to finally be transformed into the temperature of the measured target.
Additionally, medical temperature sensors are widely used in hospitals, blood banks, disease control centers, pharmaceutical plants, biopharmaceutical companies, cold chain logistics, freezers, incubators, cold rooms, and more than a dozen other application scenarios. They play an important role in monitoring temperature and humidity in these settings.
Anesthesia Machines
Temperature sensors with thermistor elements in anesthesia machines can monitor the temperature and humidity of the air delivered by the machine, ensuring comfortable breathing for the patient and preventing sore throats caused by inhaling dry, cold air.
Diagnostic Equipment
Temperature sensors with thermistor elements in blood analyzers monitor the temperature of chambers, diffusion lamps, and oil-cooled motors to prevent overheating. If overheating occurs, the machine should be immediately stopped to allow it to cool down.
Medical Temperature Probe
Thermistors encased in glass or plastic can be used to measure temperatures in the rectum, mouth, and other areas, while thin-film thermistors are used to measure surface body temperature. The future development prospects for thermistors are vast.
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