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Engineer develops miniature thermometer heating device to monitor harsh ambient temperatures
"China Instrument Network Instrument Development" "It's like a small furnace." Engineer Ming Han described his team's latest study found that the use of laser heating silicon tip fiber device can achieve a high temperature of nearly 2000 degrees Fahrenheit, a second Time can be increased from room temperature to 300 degrees.
Because of its "miniature" volume, this device means that it is microscopic in dimension, its diameter is about one tenth of a millimeter, and it is about the thickness of a piece of paper.
The heating capacity of the device can be used for environmental monitoring, including the detection of greenhouse gases to a range of applications for biological specimen research applications such as the production of microbubbles for medical and industrial applications. It can also be used as a thermometer whose performance allows applications at extreme high temperatures, such as those used to monitor the harsh environment of engines and power plants, Han said.
"We have implemented a simple sensor structure with a very effective heating mechanism," said Han, an associate professor of electrical and computer engineering. "In other devices, the heating element and the temperature sensing element are usually two different elements. Here, we have integrated into the same tiny structure."
In Han's previous work, he designed an optical fiber temperature sensor suitable for sensing in the marine field. Like the new design, this sensor is characterized by a tiny silicon pillar attached to the end of the fiber. This flexible glass filament can transmit light signals at extremely high speeds. However, the glue that binds silicon and fiber will soften at about 200 degrees Fahrenheit, limiting its use at high temperatures.
"We then made breakthroughs," Han said.
After bonding the fiber to the silicon column again with adhesives, the team used a very hot current arc, essentially a continuous flash of lightning, merging another fiber line with the other side of the column. This process softens the other side of the glue at the same time, and separates the original fiber chain, leaving only the new fused structure.
From this process, Han's team transmitted light into the fiber by using two wavelengths of light. The laser light of 980 nm wavelength was absorbed by silicon, and the light of another wavelength of 1550 nm passed.
Since the absorbed laser generates heat, its remote control capability can determine the temperature of the device. At the same time, a wider range of wavelengths enters the silicon and reflects at the ends of the pillars at both ends of the silicon and begins to interfere. This interference pattern changes as the temperature of the silicon changes, allowing precise and sensitive thermometer functions to be achieved.
Han and his researcher, Guigen Liu, conducted the design. The latter is a postdoctoral fellow in electrical and computer engineering. He said that the device has the ability to produce a wide range of wavelengths. Based on their device, they can interact with these wavelengths in the far infrared range. Gas monitoring. And it can measure and adjust its temperature, Han said, making this device versatile and has a great advantage over existing miniature heaters.
"We still have a lot of work to do to make this equipment better," he said. "This is a very promising technology. There will be many exciting applications in the future."
(Original Title: Engineer Makes a Micro Heater - Thermometer Device)