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Abroad research and development of ultra-sensitive temperature sensors with a wide range of applications
[ Instrument R&D of Instrument Network ] Can the "thermometer" be composed of thin films or tiny (micrometer or even nanometer) particles, work in real time in a very clear area with a spatial resolution from centimeters to micrometers, and can be at 80 Kelvin (minus 193 ° C) To measure the temperature Kelvin (476 degrees Celsius) with extremely high sensitivity in a wide frequency band up to 750 Kelvin (750 Kelvin)? The answer is yes.
On June 24th, researchers from the University of Sao Paulo (USP) and the University of Campinas (UNICAMP) in the State of Sao Paulo, Brazil, invented the device in the laboratory. Basically, it is a temperature sensor that has almost no effect on the temperature of an object.
Antonio Ricardo Zanata, a researcher at the USP San Carlos Institute of Physics and one of the project researchers, said: "Because the device is optical, there is no direct physical contact between the objects about the temperature of the objects. Obtained under the circumstances. It is enough to project the laser beam onto the sensor and observe its response. By using a detector to measure the wavelength of the light emitted by the sensor, the temperature of the object can be determined very accurately."
When excited by a laser pulse, the sensor-a system composed of titanium dioxide (TiO2) doped with thulium ions (Tm3+)-emits light whose wavelength changes with the ambient temperature, and this temperature is determined using very precise wavelength measurements. The wavelength changes by approximately 2 picometers (2x10-12 meters) per degree of temperature, and spectroscopy can be used to detect such small wavelength changes.
Zanata said: "The change in the wavelength of the emitted light is absolutely linear between 80 and 750 Kelvin, and within this temperature range, the device remains intact and stable."
The applications of this temperature sensor range from identifying hot spots in electronic devices to detecting virus or bacterial infections in specific areas of organisms.
Because it can measure a very broad temperature spectrum, it can be used in manufacturing-where the temperature sometimes reaches very high levels-and biological processes that are very sensitive to small temperature changes. At this stage, the researchers have arranged a material in the form of a thin film. In theory, this material can be used as a coating on any surface, whether flat or curved, smooth or rough. This material can also be presented as microparticles or nanoparticles. As a thin film, this material can be as small as a few square centimeters or several square meters, and is used as a surface coating for ground vehicle, aircraft, or grid transformer components. As micron or nanoparticles, it can be dispersed in a liquid medium while remaining solid.
At this stage, the demand for dedicated detectors is a limiting factor in terms of equipment cost and portability. Zanata said: "Considering the need for lasers and detectors, the current cost of related instruments is very high. However, we believe that with the advancement of technology, it will be possible to manufacture an integrated device, which includes a semiconductor laser and a temperature sensor And detectors. From laboratory to industrial scale, can greatly reduce costs."
(Original title: Overseas research and development of ultra-sensitive temperature sensors with a wide range of applications)