Common spectrum analyzers mainly use digital display. Each point on the display trace represents a frequency range. This frequency range is called a "bucket". We use some mathematical operations to extract the information data we want from this bucket, and then display the data on the display. Buckets include two concepts: "frequency" and "duration":
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In the field of semiconductor devices, field effect transistors (FETs) play an indispensable role in circuits with their unique conductive properties. The core of FETs is to use voltage to precisely control the flow of current, including the gate, source, and drain. It controls the charge density by changing the gate voltage field, and then adjusts the resistance to achieve precise control of the current.
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The research team fabricated a nMAG/epi-Si detector with low defect density and spectral dependence, which has high responsivity and detectivity at a wavelength of 1550 nanometers, suitable for near-infrared optical communications and high-resolution imaging. It has high gain and self-quenching characteristics under low reverse bias, which reduces noise and improves signal stability. In addition, the low noise and fast response of the detector enable it to achieve a data transmission rate of 38 Mbps. These characteristics indicate that nMAG/epi-Si heterostructures have great potential in the fields of infrared detection and optical communications.
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This research used three-dimensional self-curling nanotechnology and combined it with thermoelectric functional materials to successfully design and manufacture a new self-curling three-dimensional photothermoelectric detector. The three-dimensional tubular structure significantly enhances light absorption and thermal localization effects, and improves light-heat-electricity conversion efficiency through locally concentrated photothermal energy. This self-curling photothermoelectric detector not only has high sensitivity and wide spectral response range, but also has unique functions such as self-driving, omnidirectional detection and polarization imaging, which indicates its huge application potential in on-chip integrated optoelectronic systems.
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The power amplifier is based on the selective excitation application of arbitrary vibration pure modes of the structure of distributed shear piezoelectric sheets.
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Experimental content: In this study, a detection device for signal excitation and sensing by piezoelectric beam sensor was built, the stability of signal detection was analyzed, the resonance frequency and sound velocity of pear were extracted, and the hardness of pear was evaluated. Then, linear regression analysis was performed between the evaluation hardness of these two response parameters and the measurement results of the M-T puncture method (Magness-Taylor) to construct the detection model of the hardness of fragrant pear.
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