A high-sensitivity low-frequency fiber optic hydrophone based on weak value amplification (WVA) is proposed and demonstrated. polarization maintaining (PM) with a length of 0.8 m wound around polycarbonate (PC) tube used as the sensing element. Theoretical analysis shows that PM in WVA measurement scheme responds to underwater acoustic pressure unprecedented sensitivity. The prototypical such can sense disturbance 1.3×10-6 Pa/Hz1/2 at 10 Hz, flat frequency response band 0.1-50 Hz....

In recent years, terahertz (THz) imaging has attracted much attention because of its ability to obtain physical and chemical information in a label-free, noninvasive nonionizing manner. However, the low spatial resolution traditional THz systems weak dielectric response biological samples hinder application this technology biomedical field. paper, we report new near-field method for single bacteria, through coupling effect nanoscale radius probe platinum gold substrate, which greatly...

A high-sensitivity ultralow-frequency fiber optic interferometric seismometer using phase feedback control is proposed and demonstrated. The principle of sensitivity improvement described, the characteristics seismometer, including vibration sensing with Michelson interferometer without control, are analyzed in terms amplitude response response. loop designed implemented, higher for very low frequency achieved. efficacy new approach demonstrated experimentally, showing that weak signal...

A novel combination of surface plasmon resonance (SPR) and weak value amplification (WVA) is employed to measure the optical rotation angle refractive index chiral enantiomers such as sugars amino acids. An extremely low change (2.73 × 10-4 rad) readily measurable, with a resolution 6.75 10-7 rad, 1 order magnitude higher than that obtained using intensity modulation, 1.13 10-6 RIU also detected, 1.99 10-9 RIU, nearly 1-order-of-magnitude increase in sensitivity over measurement based on...

A high-performance fiber optic interferometric hydrophone based on a push-pull mandrel structure, with high sensitivity and wide-frequency response, is designed developed. Each arm of the Michelson interferometer coil wrapped onto separate but concentric thin elastic tube as sensing to detect acoustic pressure wave. The fabricated examined experimentally, demonstrating its capacity very low-frequency underwater variation. theoretical design validated results showing that has an average...

The ecological-economic coordination degree model is widely used to analyze eco-economic relationships, but methods for determining the relative weights of ecological and economic systems lack a scientific basis. Examining Yellow River Basin based on Major Function-Oriented Zoning (MFOZ) in China, study surveyed 42 experts analytic hierarchy process (AHP)to calculate different main function zones. It also improved evaluated system 642counties eight provinces from 1991 2015. results indicate...

Organelles play core roles in living beings, especially internal cellular actions, but the hidden information inside cell is difficult to extract a label-free manner. In recent years, terahertz (THz) imaging has attracted much attention because of its penetration depth nonpolar and non-metallic materials label-free, non-invasive non-ionizing ability obtain interior bio-samples. However, low spatial resolution traditional far-field THz systems weak dielectric contrast biological samples...

A seafloor seismic and tsunami monitoring system based on fiber optic interferometric technology was developed installed in the nearby waters at Chinese State Oceanic Administration's (SOA) Wuchang (Hainan Province, China) site. The tricomponent seismometer has a sensitivity of 57 dB (re: 0 = 1 rad/g), within operation frequency range 0.005-50 Hz, minimum detectable acceleration 43.4 ng/√(Hz); while water-level monitor an accuracy ±1 cm, measurement 0-110 m. been operating continuously since...

The focusing performance of an active short-range millimeter-wave imager is vulnerable to phase errors. As two major sources error, delay uncertainty and array deformation are entangled when they treated by conventional calibration methods, leading defocusing. First, the defocusing effect caused element position deviation (EPD) graphically described in form ellipse deformation, indicating that results imaging a point target can inform on distribution EPD. Second, we analyze error coupling...

An improved one-stationary bistatic synthetic aperture radar (OS-BiSAR) range migration algorithm (RMA) with loss compensation for millimeter-wave imaging is presented. In the process of image reconstruction, 2-D spectral amplitude factor considered during Fourier transform propagation loss, and linear-phase spectrum formula derived. The efficiency proposed analyzed theoretically demonstrated experimentally. Numerical simulations experimental results show that performs well in compensating...

Millimetre wave imaging systems are widely used in many fields, such as non‐destructive testing, security screening and medical imaging. For security‐related personnel screening, the geometries of planar cylindrical‐scanning antenna arrays often adopted. A array imager is capable acquiring a three‐dimensional image real time, but information on back side object will be lost. cylindrical scanning well suited for constructing an full 360° directions, what lost time that it takes to complete...

To reduce the adverse effects of propagation delay uncertainty caused phase error, a pragmatic self-calibration approach for millimeter-wave multiple-in multiple-out (MIMO) imaging is proposed and demonstrated. Based on analysis contributions assumption identical channel design, direct coupling between array elements used to estimate hardware-caused inherent delay, requiring no additional reference aid. Of common part due interchannel difference are estimated separately. Combined with...

A millimeter-wave (mmW) range enhancement imaging technique for multistatic planar arrays is presented. The echo in an active mmW system that contains both amplitude and phase information, the latter can be potentially exploited improving performance direction. With help of a two-dimensional (2-D) unwrapping scheme, multi-input-multi-output migration algorithm (MIMO-RMA) array, along with requisite pretreatment processes such as target extraction error correction reconstructed image region,...

A novel combination of terahertz time-domain spectroscopy (THz-TDS) and weak value amplification (WVA) is employed to quantify the glucose content various forms, such as thin films with concentrations from 0.01 0.10 mg/mL, solutions tablets mass fraction varying 5.0 10.0%, which drastically outperforms classical THz-TDS detection technique. The small concentration changes samples in forms that are beyond traditional limit can be detected by introduction WVA. For solutions, minimum detectable...

An effective approach for general measurement based on weak value amplification using non-Gaussian broadband light sources is demonstrated. This scheme can reduce the difficulty of preparing apparatus and correcting systematic error caused by imperfection device's wave function, thus making weak-value more convenient robust practical field applications. The influence several common noise in a application analyzed theoretically examined experimentally. A purely imaginary phase system...

Baicalin (C <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">21</sub> H xmlns:xlink="http://www.w3.org/1999/xlink">18</sub> O xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> ) is the main ingredient of traditional Chinese herbal medicine Scutellaria Baicalensis Georgi, with proven bacteriostatic, anti-inflammatory, anti-hypertensive, and anti-allergic effects. It widely used in a variety popular nonprescription drugs, consumer safety quality...

The influence of the parameters elastic mandrel on performance fiber-optic interferometric hydrophone with a push–pull structure comprised two concentric cylindrical shells is investigated through systematic solid mechanical analysis. structural and material considered include Young’s modulus, Poisson ratio, thickness, length, outer radius tube. result shows that higher sensitivity can be obtained lower modulus thinner wall, larger radius, longer length tube, accompanied by fundamental...