Simultaneous visualisation of transient species in flames by planar-laser-induced fluorescence using a single laser system

1999 ◽  
Vol 68 (2) ◽  
pp. 251-255 ◽  
Author(s):  
R. Bombach ◽  
B. Käppeli
Keyword(s):  
Laser System ◽  
Laser Induced Fluorescence ◽  
Transient Species ◽  
Single Laser ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser

All Fiber-Coupled OH Planar Laser-Induced-Fluorescence (OH-PLIF)-Based Two-Dimensional Thermometry

2017 ◽  
Vol 72 (4) ◽  
pp. 604-610 ◽  
Author(s):  
Paul S. Hsu ◽  
Naibo Jiang ◽  
Anil K. Patnaik ◽  
Vish Katta ◽  
Sukesh Roy ◽  
...  
Keyword(s):  
Laser System ◽  
Laser Induced Fluorescence ◽  
Harsh Environments ◽  
Pulse Interval ◽  
Practical Implementation ◽  
Fluorescence Signal ◽  
Two Dimensional ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser ◽  
Proof Of Principle

Two-color, planar laser-induced fluorescence (PLIF)-based two-dimensional (2D) thermometry techniques for reacting flows, which are typically developed in the laboratory conditions, face a stiff challenge in their practical implementation in harsh environments such as combustion rigs. In addition to limited optical access, the critical experimental conditions (i.e., uncontrolled humidity, vibration, and large thermal gradients) often restrict sensitive laser system operation and cause difficulties maintaining beam-overlap. Thus, an all fiber-coupled, two-color OH-PLIF system has been developed, employing two long optical fibers allowing isolation of the laser and signal-collection systems. Two OH-excitation laser beams (∼283 nm and ∼286 nm) are delivered through a common 6 m long, 400 µm core, deep ultraviolet (UV)-enhanced multimode fiber. The fluorescence signal (∼310 nm) is collected by a 3 m long, UV-grade imaging fiber. Proof-of-principle temperature measurements are demonstrated in atmospheric pressure, near adiabatic, CH4/O2/N2 jet flames. The effects of the excitation pulse interval on fiber transmission are investigated. The proof-of-principle measurements show significant promise for thermometry in harsh environments such as gas turbine engine tests.

Quantification of mixing of oxygen and iodine in Chemical Oxygen Iodine Lasers using planar laser induced fluorescence

2000 ◽  
Author(s):  
T. Muruganandam ◽  
Srihari Lakshmi ◽  
A. Ramesh ◽  
S. Viswamurthy ◽  
R. Sujith ◽  
...  
Keyword(s):  
Laser Induced Fluorescence ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser

scholarly journals The 3D Modeling System for Bioaerosol Distribution Based on Planar Laser-Induced Fluorescence

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2607
Author(s):  
Siying Chen ◽  
Yuanyuan Chen ◽  
Yinchao Zhang ◽  
Pan Guo ◽  
He Chen ◽  
...  
Keyword(s):  
3D Reconstruction ◽  
3D Modeling ◽  
Aerosol Particles ◽  
Laser Induced Fluorescence ◽  
Frame Rate ◽  
Oxide Semiconductor ◽  
Laser Source ◽  
Confined Space ◽  
Planar Laser Induced Fluorescence ◽  
Planar Laser

Although it is quite challenging to image and analyze the spatial distribution of bioaerosols in a confined space, a three-dimensional (3D) modeling system based on the planar laser-induced fluorescence (PLIF) technique is proposed in this paper, which is designed to analyze the temporal and spatial variations of bioaerosol particles in a confined chamber. The system employs a continuous planar laser source to excite the fluoresce, and a scientific complementary metal oxide semiconductor (sCMOS) camera to capture images of 2048 × 2048 pixels at a frame rate of 12 Hz. While a sliding platform is moving back and forth on the track, a set of images are captured at different positions for 3D reconstruction. In this system, the 3D reconstruction is limited to a maximum measurement volume of about 50 cm × 29.7 cm × 42 cm, with a spatial resolution of about 0.58 mm × 0.82 mm × 8.33 mm, and a temporal resolution of 5 s. Experiments were carried out to detect the PLIF signals from fluorescein aerosols in the chamber, and then 3D reconstruction was used to visualize and analyze the diffusion of aerosol particles. The results prove that the system can be applied to clearly reconstruct the 3D distribution and record the diffusion process of aerosol particles in a confined space.

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