“It's like a small furnace.†Engineer Ming Han described his team's latest study that uses laser-heated silicon-tip fiber optic equipment to achieve temperatures as high as 2000 degrees Fahrenheit and can be achieved in one second. The temperature rises to a high temperature of 300 degrees.
Due to its "small" volume, this device means microscopic in size, with a diameter of about one tenth of a millimeter, which is about the thickness of a piece of paper.
The device's heating capabilities can be used for environmental monitoring, including the detection of greenhouse gases for use in 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 for applications in extremely high temperature conditions, such as for monitoring the harsh ambient temperatures of engines and power plants, Han said.
“We have implemented a simple sensor structure with a very efficient heating mechanism,†says Han, an associate professor in the Department of Electrical and Computer Engineering. “In other devices, the heating element and the temperature sensing element are usually two different components. Here we have integrated into the same tiny structure.â€
In his previous work, Han designed a fiber optic temperature sensor for sensing in the marine sector. Like the new design, the sensor features a tiny silicon column attached to the end of the fiber that transmits the optical signal at very high speeds. But the glue that binds silicon and fiber will soften at around 200 degrees Fahrenheit, limiting its use at high temperatures.
“Then we have a breakthrough,†Han said.
After bonding the fiber and silicon column with the adhesive again, the team used a very hot current arc, essentially a continuous lightning bolt, merging the other fiber line with the other side of the column. This process simultaneously softens the glue on the other side and separates the original fiber strand, leaving only the newly fused structure.
From this process, Han's team transmitted light into the fiber by using two wavelengths of light. The 980 nm wavelength laser was absorbed by the silicon and the other 1550 nm wavelength light passed.
Since the absorbed laser generates heat, its remote control capability determines the temperature of the device. At the same time, a wider range of wavelengths enter the silicon and are partially reflected at the ends of the silicon and begin to form interference. This type of interference changes as the temperature of the silicon changes, giving the thermometer the ability to make accurate and sensitive readings.
Han and his researcher Guigen Liu, who is a postdoctoral fellow in electrical and computer engineering, said the device has the ability to generate a wide range of wavelengths based on their ability to interact with these wavelengths in the far infrared range. Gas monitoring. And it can be measured and adjusted, Han said, making this device versatile and has a big advantage over existing micro-heaters.
“We still have a lot of work to do to make this equipment better,†he said. “This is a very promising technology and there will be many exciting applications in the future.â€
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