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11 papers found.
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Multi-Component and Multi-Point Trace Gas Sensing in Wavelength Modulation Spectroscopy Based on Wavelength Stabilization

Multi-component and multi-point trace gas sensing in the wavelength modulation spectroscopy is demonstrated based on the frequency-division multiplexing and time-division multiplexing technology. A reference photodetector is connected in series with a reference gas cell with the constant concentration to measure the second-harmonics peak of the components for wavelength...

Gas Absorption Center-Based Wavelength Calibration Technique in QEPAS System for SNR Improvement

A simple and effective wavelength calibration scheme is proposed in a quartz enhanced photoacoustic spectroscopy (QEPAS) system for trace gas detection. A reference gas cell is connected an InGaAs photodetector for detecting the absorption intensity peak caused by the gas to calibrate the gas absorption center using distributed feedback laser diode (DFB-LD) with sawtooth wave...

SNR Improvement of QEPAS System by Preamplifier Circuit Optimization and Frequency Locked Technique

Preamplifier circuit noise is of great importance in quartz enhanced photoacoustic spectroscopy (QEPAS) system. In this paper, several noise sources are evaluated and discussed in detail. Based on the noise characteristics, the corresponding noise reduction method is proposed. In addition, a frequency locked technique is introduced to further optimize the QEPAS system noise and...

A portable analog lock-in amplifier for accurate phase measurement and application in high-precision optical oxygen concentration detection

Citation: Xi CHEN, Jun CHANG, Fupeng WANG, Zongliang WANG, Wei WEI, Yuanyuan LIU, et al., “A Portable Analog Lock-In Amplifier for Accurate Phase Measurement and Application in High-Precision Optical

Modulation of Osteogenesis in MC3T3-E1 Cells by Different Frequency Electrical Stimulation

Electrical stimulation (ES) is therapeutic to many bone diseases, from promoting fracture regeneration to orthopedic intervention. The application of ES offers substantial therapeutic potential, while optimal ES parameters and the underlying mechanisms responsible for the positive clinical impact are poorly understood. In this study, we assembled an ES cell culture and monitoring...

Preparation, Pharmacokinetics, Biodistribution, Antitumor Efficacy and Safety of Lx2-32c-Containing Liposome

Lx2-32c is a novel taxane that has been demonstrated to have robust antitumor activity against different types of tumors including several paclitaxel-resistant neoplasms. Since the delivery vehicles for taxane, which include cremophor EL, are all associated with severe toxic effects, liposome-based Lx2-32c has been developed. In the present study, the pharmacokinetics...

A method for eliminating the impact of microwave sweeper power fluctuation in BOTDA system

Citation: Shuo JIANG, Jun CHANG, Sasa ZHANG, Zongliang WANG, Sha LUO, Boning SUN, et al., “A Method for Eliminating the Impact of Microwave Sweeper Power Fluctuation in BOTDA System,” Photonic

Application of wavelet transform modulus maxima in raman distributed temperature sensors

0 1 0 Citation: Zongliang WANG, Jun CHANG, Sasa ZHANG, Sha LUO, Cuanwu JIA, Boning SUN, et al., Application of Wavelet Transform Modulus Maxima in Raman Distributed Temperature Sensors, Photonic

Wavelength dispersion analysis on fiber-optic Raman distributed temperature sensor system

The influence of the wavelength dispersion on the temperature accuracy of the Raman distributed temperature sensor system (RDTS) is analyzed in detail, and a simple correction algorithm is proposed to compensate the fiber position error caused by the wavelength dispersion. The principle of the proposed algorithm is described theoretically, and the correction on each point along...

Analysis and improvement of SNR in FBG sensing system

The improvement of the signal to noise ratio (SNR) has significant meaning to the fiber Bragg grating (FBG) sensing system. The source of the noise as well as the signal attenuation of the FBG sensing system is analyzed. It is found that optical noise caused by the optical return loss (ORL) is the main source of noises in the system, and the coupler is the main source of...

Water vapor detection system based on scanning spectra

Scanning the absorption spectral line of water vapor through wavelength around 1368.597nm is successfully used to measure the value of micro-moisture content. The synchronous superposition average of original signal algorithm based on labview is innovated and applied to detecting weak spectrum absorption signal instead of low pass filter. Two data processing methods are used to...