wavelength modulation spectroscopy
Measurement of CO2 concentration and temperature in an aero engine exhaust plume using wavelength modulation spectroscopy
... intensity modulation (AM) and its frequency modula- tion (FM) as a function of drive ...significant wavelength dependence, such as fiber ...intensity modulation characteristics of the optical source ...
9
External cavity diode lasers and non linear optical frequency conversion in spectroscopic applications
... optical spectroscopy because of their narrow linewidths, large tuning ranges and stable ...laser spectroscopy include remote sensing, trace gas detection and process ...of modulation ...
207
An FPGA-based lock-in detection system to enable chemical species tomography using TDLAS
... absorption spectroscopy (TDLAS) in narrow line-width gas sensing ...the wavelength modulation spectroscopy (WMS) technique, is utilized to demodulate and extract first (1f) and second (2f) ...
5
A new RAM normalized 1f-WMS technique for the measurement of gas parameters in harsh environments and a comparison with 2f/1f
... Abstract: A calibration-free first harmonic (1f ) wavelength modulation spectroscopy (1f - WMS) technique for gas species parameter measurement is demonstrated. In this technique, the total magnitude ...
12
Quantitative detection of pharmaceuticals using a combination of paper microfluidics and wavelength modulated Raman spectroscopy
... Raman spectroscopy is regarded as a powerful, widely applicable analytical technique, which lends itself to the identification of unknown com- ...Raman spectroscopy with other optofluidic devices has pre- ...
10
The subcarrier multiplexing/wavelength division multiplexing for radio over fiber
... of wavelength generation for the mobile application between the Mobile Switching Centre (MSC) and Base Station (BS) are using cooper cabling and microwave radio for data ...
23
IP Pegasi in outburst : Echelle spectroscopy and modulation Doppler tomography
... After normalising the spectra, and choosing the regions of interest, the trailed spectra of the 9 emission lines were computed. They are ordered according to orbital phase and shown in Fig. 4. In order to enhance the ...
21
Advanced methods for enhanced sensing in biomedical Raman spectroscopy
... Raman spectroscopy requires power levels close to 100 mW to obtain a signal with reasonably good SNR from single cells and the acquisition time need to be only few seconds, which again would not induce any ...
154
Spectral and Angular Responses of Surface Plasmon Resonance Based on the Kretschmann Prism Configuration
... a wavelength modulation SPR sensor, and compared the full-width at half-maximum (FWHM) values of the reflectance, the phase shift and the enhancement of magnetic field intensity while acquiring the most ...
6
Recovery of absorption line shapes with correction for the wavelength modulation characteristics of DFB lasers
... The experimental arrangement for measuring the laser WM-IM phase and tuning coefficient is shown in Fig. 1. The temperature of the laser is controlled by a Thorlabs TED 200 PID tem- perature controller, and the current ...
18
Narrowband CARS spectroscopy in the molecular fingerprint region
... (CARS) spectroscopy on several organic samples from 900 to 3600 cm − 1 , covering a large part of the molecular fingerprint ...signal wavelength ranges from 880 to 1040 nm and its idler from 1090 to 1350 ...
102
Recovery of absolute absorption line shapes in tunable diode laser spectroscopy using external amplitude modulation with balanced detection
... EAR - INFRARED tunable diode laser spectroscopy (TDLS) has become a widely used method for gas measurement in industrial, environmental and safety applications. There are several molecules of interest that exhibit ...
7
Development and validation of HPLC and Spectrophotometric methods for selected multi component drugs in their formulations.
... steel analytical column from RS tech) is used as stationary phase. The detection is carried out using variable wavelength UV-vis detector set at 280 nm. The solutions are chromatographed at constant flow rate of ...
270
Performance Analysis of Crosstalk Suppression in WDM System with Fiber Optical Parametric Amplifier
... The block diagram of a four channel WDM system with 2PP-OPA is depicted in Fig. 1. Two laser sources at 1529.45 nm and 1556.8 nm serve as the pump sources. The CW pumps are Phase Modulated (PM) by 3 Gb/s Pseudo-Random ...
7
Performance Analysis of Mixed Line Rate Optical WDM Networks under Link Failure
... Wavelength routed networks provide lightpaths to its users, where lightpaths are the optical connection between source and destination node on each intermediate link. The lightpaths are routed and switched from ...
6
Review on Study of Vibrational Spectroscopy through FTIR.
... A broadband light source—one containing the complete spectrum of wavelengths to be calculated is used to produce beam which is already explained above. [1]. The light shines into a Michelson interferometer—a definite ...
7
Bioanalytical measurements enabled by surface-enhanced Raman scattering (SERS) probes
... Building upon these advances, among others in probe development(103, 104), in vivo, multiplexed detection of targeted nanoprobes in a mouse model was demonstrated by Maiti et al. in 2012.(105) In this study, near-IR SERS ...
54
Non resonant wavelength modulation saturation spectroscopy in acetylene filled hollow core photonic bandgap fibres applied to modulationfree laser diode stabilisation
... detection technique to be used, modulation is implemented either via an external signal or using a chopper. The pump source is a chip-on-carrier high-power Bookham DFB laser diode with a tuning range of ...
7
Tunable Multi Wavelength by Pulse Signal Modulation in Laser Pumping of EDFA
... multi wavelength are formed by the wavelength division multiplexed (WDM) with 980/1550 multiplexing for the coupling light pumping source into the EDFA and for using in the ...
5
Kroner, Martin (2008): Resonant photon-exciton interaction in semiconductor quantum dots. Dissertation, LMU München: Fakultät für Physik
... Semiconductor self-assembled quantum dots form a three dimensional confinement for charge carriers in the solid state matrix. The confinement modifies the density of states, leading to atom like optical properties of ...
197