Optical Thickness Measurement
Optical Thickness Measurement - Related Videos
06:27
Measurement of Aerosols Optical Thickness of the Atmosphere using the GLOBE Handheld Sun Photometer
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Cited by 4 •
2019
The goal of the methods presented here is to measure aerosol optical thickness of the atmosphere. The sun photometer is pointed at the sun and the largest voltage reading obtained on an in-built digital voltmeter is recorded. Atmospheric measurements such as barometric pressure and relative humidity are also performed.
03:13
Lymphedema Ultrasonography: A Technique to Measure the Change in Thickness of an Affected Tissue
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2023
This video utilizes ultrasonography for diagnosis and follow-up tests to determine treatment efficacy of Progressive Resistance Exercise (PRE) in breast cancer-related lymphedema (BCRL). Ultrasonography can be applied effectively to ensure diagnosis and treatment of lymphedema.
05:51
Measuring Diaphragm Thickness and Function Using Point-of-Care Ultrasound
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Cited by 9 •
2023
Diaphragm thickness and function can be assessed in healthy individuals and critically ill patients using point-of-care ultrasound. This technique offers an accurate, reproducible, feasible, and well-tolerated method for evaluating diaphragm structure and function.
08:17
Organotypic Culture of Full-thickness Adult Porcine Retina
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Cited by 19 •
2011
Here we describe a cost-effective technique for organotypic culture of adult porcine retina for seven days. Briefly, a sterile filter paper was used to lift the neural retina off from the RPE and place photoreceptor side up on an insert raised by a custom-made stand.
14:09
Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope
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Cited by 11 •
2014
We describe the use of a standard optical microscope to perform quantitative measurements of cellular mass, volume, and density through a combination of bright field and differential interference contrast imagery.
FAQs
The Beer–Lambert relationship connects light attenuation with three key variables: absorber concentration, the distance light travels through the sample, and wavelength. Changing any of these factors can alter the measured optical depth or absorbance. This relationship allows researchers to interpret transmitted-light measurements in terms of concentration or sample properties rather than treating intensity loss as an isolated observation.
Wavelength matters because attenuation depends on the wavelength at which the sample is examined. A sample can therefore produce different optical-depth or absorbance values under different illumination conditions. Controlling or reporting wavelength is important when comparing measurements, evaluating composition, or using the result to calibrate imaging systems for cells, tissues, biomaterials, or engineered constructs.
Increasing absorber concentration or increasing the path length generally increases the amount of attenuation represented by the measurement, according to the Beer–Lambert relationship. These variables must be considered when comparing samples or interpreting changes over time. A measured difference may reflect altered composition, a different travel distance, or both, rather than a change in structure alone.
The measurement can provide indirect information about sample composition, concentration, and structure by showing how strongly the material attenuates light. In bioengineering, those signals help characterize cells and tissues as well as biomaterials and engineered constructs. Interpretation depends on relating the measured optical depth or absorbance to the relevant sample and measurement conditions.
A basic workflow compares the intensity of light incident on a sample with the intensity transmitted through it. The resulting attenuation is then expressed as optical depth or absorbance and interpreted using the Beer–Lambert relationship when appropriate. Researchers relate the result to absorber concentration, path length, and wavelength to obtain meaningful information about the sample.
Bioengineers apply the technique in concentration assays, imaging calibration, and bioprocess monitoring. It also supports characterization of cells, tissues, biomaterials, and engineered constructs. These uses make light attenuation a practical readout for tracking sample properties or establishing measurement conditions, including work involving scaffold development and the development of engineered tissue.
Measurements provide a way to assess light attenuation from engineered constructs and relate that response to their composition, concentration, or structure. In scaffold and tissue-development studies, repeated characterization can help document changes in the construct as development proceeds. The result is a quantitative optical readout that complements broader evaluation of engineered tissue or scaffold properties.