Related Experiment Video
Updated: Jan 22, 2026
07:22
Standardized Method for Measuring Collection Efficiency from Wipe-sampling of Trace Explosives
Published on: April 10, 2017
9.9K
High-speed imaging system to visualize particle removal/collection via wipe sampling and aerodynamic sampling
Matthew Staymates1, Greg Gillen1, Jessica Staymates1
1Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 301-975-3913, USA.
The Review of Scientific Instruments
|July 1, 2019
Summary
A new high-speed imaging system visualizes microscopic particle removal during sampling. This technology offers insights into particle dynamics for improved collection efficiency and forensic analysis.
Area of Science:
- Forensic Science
- Particle Physics
- Imaging Technology
Background:
- Effective particle collection is crucial for forensic analysis and environmental monitoring.
- Understanding particle dynamics during sampling is essential for optimizing collection methods.
- Current visualization techniques often lack the speed and resolution to capture dynamic particle removal events.
Purpose of the Study:
- To develop and demonstrate a high-speed imaging system for microscopic visualization of particle removal during sampling.
- To gain insights into the interactions between particles and surfaces during wipe and aerodynamic sampling.
- To evaluate the system's capability in visualizing the collection of various particle types, including those relevant to explosives detection.
Main Methods:
- Implementation of a high-speed digital camera, microlens, custom sample mount, sampling sled, and illumination source.
- Microscopic visualization of micrometer-sized particles during simulated wipe sampling and aerodynamic sampling events.
- Application of the system to analyze particle removal from surfaces using different wipe materials and air jet impingement.
Main Results:
- Direct visualization of wipe-particle and particle-particle interactions during the sampling process.
- Demonstration of the system's ability to capture the dynamics of particle removal and collection.
- Successful imaging of polymer microspheres and explosive-laden fingerprint particles during sampling events.
Conclusions:
- The developed high-speed imaging system provides unprecedented microscopic visualization of particle sampling dynamics.
- This technology offers valuable insights into the mechanisms of particle removal and collection, aiding in the optimization of sampling strategies.
- The system has potential applications in forensic science, environmental monitoring, and the development of advanced particle collection technologies.
Related Concept Videos
01:18Sampling Methods: Sample Types
3.1K
Sampling materials are classified into three main types: solid, liquid, and gas.
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...
Solid samples include a variety of substances, such as sediments from water bodies, soil, metals, and biological tissues. Two standard methods for extracting sediments from water bodies are grab sampling and piston coring. Grab sampling involves using a device to collect a discrete sediment sample from the bottom of a water body with minimal disturbance. Grab samples do not always represent the entire area due to...
3.1K
01:18Imaging Biological Samples with Optical Microscopy
8.9K
Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
8.9K
01:15Sampling Theorem
1.3K
In signal processing, the analysis of continuous-time signals, denoted as x(t), often involves sampling techniques to convert these signals into discrete-time signals. This process is essential for digital representation and manipulation. A critical component in sampling is the train of impulses, characterized by the sampling interval and the sampling frequency. The relationship between these parameters and the original signal's properties dictates the success of the sampling process.
1.3K
01:17Bandpass Sampling
480
In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
480
01:23Sampling Plans
905
Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
905
01:02Sample Handling
2.5K
Transportation of samples from the collection point to the laboratory, as well as storage and preservation techniques, are crucial for maintaining sample integrity and ensuring accurate and reliable test results.
Samples should be transported carefully from collection points to the laboratory. They should be properly sealed and clearly labeled to prevent cross-contamination. To preserve the sample integrity, optimal temperature conditions during transport are essential. This could involve using...
Samples should be transported carefully from collection points to the laboratory. They should be properly sealed and clearly labeled to prevent cross-contamination. To preserve the sample integrity, optimal temperature conditions during transport are essential. This could involve using...
2.5K