TeraFETs are THz power detectors based on field-effect transistors (FETs) integrated with antennas. The first part of this paper discusses the design Si CMOS leading to an optimized noise-equivalent close room-temperature limit. impact choice gate width and length, role parasitic effects associated technology node, conjugate matching antenna FET impedance – which is possible over narrow frequency bands because dependence channel resulting from plasmonic highlighted. Taking these aspects into...

We present experimental results of an investigation into the performance a commercial, packaged GaAs high-electron-mobility transistor (HEMT) as detector terahertz (THz) radiation in frequency ranges 0.22-0.32 and 0.520-0.650 THz. Enclosed standard ceramic housing without dedicated antenna for coupling, is capable sensitive direct detection (power detection) THz at room temperature. The device responsivity shows strong variation with wavelength, indicating that various features (transistor...

Abstract An open‐tubular capillary electrochromatography method has been developed for the determination of binding constants between β 2 ‐adrenergic receptor ( ‐AR) and seven drugs . ‐AR was oriented immobilized onto one part inner surface via microwave‐assisted technical synthesis. According to linear relationship coating length apparent mobility analyte, constant K b ) can be obtained by related theories equations. The order values such as adrenaline hydrochloride, norepinephrine...

In this paper, the textural characteristics of buildings were quantified by using two texture descriptors, namely, Square Root Pair Difference (SRPD) and Gi*. Then, a novel method, based on SRPD Gi*, to extract building areas in urban from very high resolution SAR images is presented. The results showed that method has ability differentiate complicated features areas, which can be employed for land mapping provides support relief operations.

Abstract Background Blood pressure (BP) exhibits seasonal variations, with peaks reported in winter. However, the association between variations and blood variability patients new-onset essential hypertension is not fully understood. This study evaluated potential of hypertension. Methods retrospective observational recruited a total 440 consecutive who underwent 24-h ambulatory electrocardiograph (ECG) BP measurement at our department January 2019 December 2019. Demographic baseline...

Sports and physical fitness play important roles in people’s daily life. By sticking to exercise we can better enjoy a healthy Scientific accurate monitoring of sports training individual condition is important. However, many challenges still need be solved, such as the complex design measurement devices, external power supplies, inaccurate data, unscientific methods. Recently, TENG-based self-powered real-time sensors have attracted much more attention due their unique advantages wearable...

In this paper, the performance of terahertz (THz) radar based on high resolution range profile (HRRP) is described. This radar, developed for imaging under complex environment such as sand-dust weather and so on, operates at 230GHz over multiple GHz bandwidth. First, we used a small corner reflector calibration object to build nonlinear error correction model. Then, large was placed ~1 kilometer (km) away target acquire profile, which check if calibrator plays roles. Finally, HRRP car...

This paper describes a high performance of opto-mechanically scanned millimeter-wave imager for airport security. It employs crank-rocker mechanism to generate speed line scanning, which produces horizontal FOV (field view) 30°. Accompanied by frame scanning mirror ±18° in the vertical direction, it brings about two-dimensional scan scene 146cm×75cm is 1 meter away from system. By this mechanism, we use single channel 94GHz receiver collect radiation convex lens acts as focusing element....

This paper describes a novel multi sensors image fusion technology which is presented for concealed weapon detection (CWD). It known to all, because of the good transparency clothes at millimeter wave band, radiometer can be used and distinguish contraband beneath clothes, example guns, knives, detonator so on. As result, we adopt passive (PMMW) imaging airport security. However, in consideration wavelength single channel mechanical scanning, has law optical resolution, can't meet need...

A novel passive THz imaging system of single channel and optical-mechanical scanning is described. It employs a Cassegrain antenna 390mm in diameter, achieves the two-dimensional via cooperation line mirror, driven by crank-rocker mechanism high speed, motion frame mirror. Thus, has many advantages such as low cost, simple structure, efficient so on. The time only 20s, field view (FOV) 30°× 36°, angle resolution up to 0.6°. experimental results show that can image human body, effectively...

In this paper we proposed a method of phase extraction for continuous terahertz wave. Firstly, study the mathematical relationship between electro-optic sampling signal and wave in theory, then build platform wave, using BWO as source radiation Fs-laser detection pulse. After differential circuit principle sampling, detect polarization properties optical transform it into electric signal. With filter amplifying processing, obtain THz at 0.2 THz. This provides potential way to coherent...

A novel passive single-channel THz imaging system employing a Cassegrain antenna of 390 mm in diameter and Schottky diodes as detecting part, the cooperation high-speed line scanning mirror driven by crank-rocker mechanism frame two-dimensional optical-mechanical part is described this paper. The single time only 20s, field view (FOV) 30° × 36°, angle resolution up to 0.6°. experimental results show that low cost, simple structure efficient can clearly image human body, effectively detect...

Compared with microwave synthetic aperture radar (SAR), terahertz (THz) SAR has advantages of higher frequency, resolution, frame rate and so on. Meanwhile, THz is able to penetrate through cloud, smoke dust low attenuation, which leads the applications high-resolution imaging target recognition in complex battlefield environment. In this paper, results carborne 5-GHz test are demonstrated. Besides, we have verified design broadband system key technique high-frequency vibration compensation....

With the majority needs of various observation, such as public security system including and traffic monitoring system, we can use optical which not only satisfy wide field also meet monitoring. The continuous zoom realize remain off accurate detection would requirements.

The research of active solid-state electronic terahertz (THz) imaging systems have been devoted enormous efforts, which play an important role in nondestructive testing. In this paper, a scanning system based on modulated THz source at 330GHz is described. To investigate the penetrability waves band, we use four kinds shelters experiment. A pyroelectric detector connected to oscilloscope achieve voltage data processed by self-developed collection and processing system. results are compared...

In this paper we demonstrated a coherent raster-scan imaging system that can acquire phase information based on continuous terahertz imaging. It mixes the with Fs-laser by electro-optic crystal of ZnTe to make hybrid modulation achieve detection. way, it not only propagate for long distance but also detection The surface images objects are under test be obtained Backward-Wave Oscillator, which output power is 10mW at 205.994GHz. With repetition frequency 80MHz, MaiTai 1.65W and 100fs pulse...

Terahertz(THz) wave modulator technology, due to its important value of imaging and detecting research. In the paper, we discuss Polyethylene lens based terahertz front modulation, which is benefit image technology. Simulation results show that optical system can extent depth field test objects on continuous source. The way get has significant meaning for detection large quality.

In this paper, we discuss the diffusion motion of carriers in transistor channel a terahertz frequency range, and propose an resistance-capacitance-inductance (RCL) model based on Boltzmann transport theory, then put forward rules to determine whether part RCL can be neglected for field-effect-transistor (FET) detectors. The traditional FET detectors is classic kinetic theory. only drift scattering carrier density are considered, without giving any explanation. To solve problem, paper adopt...

In this paper, we demonstrated a passive Q-switched 2μm dual-wavelength intra-cavity PPLN optical parameter oscillator (OPO) with the advantages of compactness, large tuning range, and narrow linewidth. By using c-cut Nd:YLF crystal as laser gain medium, output power fundamental at 1053nm can reach up to 0.916W, corresponding incident pump 9.79W. When temperature was varied between 40°C 160°C, orthogonal polarized lasers be tuned from 2026.4nm 2193.9nm. As a-cut situation, wavelength 1047nm...