Related Experiment Video
Updated: Feb 15, 2026
10:11
Whole-Body Nanoparticle Aerosol Inhalation Exposures
Published on: May 7, 2013
16.3K
Multi-aperture laser transmissometer system for long-path aerosol extinction rate measurement
Applied Optics
|February 6, 2018
Summary
A novel laser transmissometer system accurately measures aerosol extinction rates over long paths, overcoming atmospheric turbulence. This robust system enhances atmospheric monitoring and optical communication applications.
Area of Science:
- Atmospheric optics
- Laser remote sensing
- Aerosol science
Background:
- Atmospheric turbulence distorts laser beams, complicating long-path extinction measurements.
- Conventional transmissometers struggle with turbulence-induced beam wander and power fluctuations.
- Accurate aerosol characterization is vital for environmental monitoring and optical systems.
Purpose of the Study:
- To develop and validate a novel laser transmissometer system for robust aerosol extinction rate measurements.
- To demonstrate immunity to atmospheric turbulence effects in long-path measurements.
- To enhance the reliability of aerosol property assessment for various applications.
Main Methods:
- Utilized an ON/OFF modulated Gaussian beam transmitter and a receiver with multiple point detectors.
- Employed a sparse detector arrangement to mitigate turbulence-induced beam distortion and wander.
- Integrated distributed detector readouts to eliminate temporal power fluctuations caused by turbulence.
Main Results:
- The developed transmissometer system demonstrated accurate performance with turbulence strength up to 10-12 m-2/3 over a 1-km path.
- Simulations and field experiments confirmed the system's resilience to atmospheric channel effects.
- The system effectively ruled out turbulence-induced temporal power fluctuations.
Conclusions:
- The new laser transmissometer system offers a reliable solution for long-path aerosol extinction measurements in turbulent atmospheres.
- Its turbulence- and weather-resistant design provides significant advantages for directed energy, free-space optical communications, and environmental monitoring.
- This technology advances the study of aerosol concentration, absorption, and scattering properties.
Related Concept Videos
03:09Measuring Reaction Rates
31.4K
Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
31.4K
01:22Mean free path and Mean free time
5.3K
Consider the gas molecules in a cylinder. They move in a random motion as they collide with each other and change speed and direction. The average of all the path lengths between collisions is known as the "mean free path."
5.3K
01:21Path Between Thermodynamics States
4.1K
Consider the two thermodynamic processes involving an ideal gas that are represented by paths AC and ABC in Figure 1:
4.1K
03:48Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion
31.4K
Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
31.4K
01:24Generalization, Discrimination, and Extinction
1.5K
Generalization, discrimination, and extinction are key concepts in operant conditioning that influence how behaviors are learned and maintained.
Generalization occurs when a behavior reinforced in one context is performed in similar situations. For instance, a student who studies diligently for calculus and receives excellent grades might apply the same study habits to psychology and history, expecting similar results. Generalization shows how learning in one setting can influence behavior in...
Generalization occurs when a behavior reinforced in one context is performed in similar situations. For instance, a student who studies diligently for calculus and receives excellent grades might apply the same study habits to psychology and history, expecting similar results. Generalization shows how learning in one setting can influence behavior in...
1.5K
01:10Interference: Path Lengths
2.2K
Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
2.2K