Method and apparatus for monitoring and measuring the surface tension of a fluid using fiber optics
- Oak Park, IL
- Evanston, IL
A non-contact method and apparatus for measuring and monitoring the surface of a fluid using fiber optics and interferometric detection to permit measurement mechanical characteristics' fluid surfaces. The apparatus employs an alternating electric field gradient for generating a capillary wave on the surface of the fluid. A fiber optic coupler and optical fiber directs a portion of a laser beam onto the surface of the fluid, another portion of the laser beam onto the photo sensor, and directs light reflected from the surface of the fluid onto the photo sensor. The output of the photo sensor is processed and coupled to a phase sensitive detector to permit measurement of phase shift between the drive signal creating the capillary wave and the detected signal. This phase shift information is then used to determine mechanical properties of the fluid surface such as surface tension, surface elasticity, and surface inhomogeneity. The resulting test structure is easily made compact, portable, and easy to align and use.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- DOE Contract Number:
- FG02-84ER45125
- Assignee:
- Northwestern University (Evanston, IL)
- Patent Number(s):
- US 5303030
- OSTI ID:
- 869238
- Country of Publication:
- United States
- Language:
- English
Static and dynamic properties of pentadecanoic acid monolayers at the air-water interface
|
journal | May 1986 |
A study of the mechanical behavior of surface monolayers using orthogonal Wilhelmy plates
|
journal | January 1989 |
Local mechanical properties of monomolecular films on water measured with a capillary wave probe
|
journal | July 1990 |
Novel technique for dynamic surface tension and viscosity measurements at liquid–gas interfaces
|
journal | October 1978 |
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Related Subjects
apparatus
monitoring
measuring
surface
tension
fluid
fiber
optics
non-contact
interferometric
detection
permit
measurement
mechanical
characteristics
surfaces
employs
alternating
electric
field
gradient
generating
capillary
wave
optic
coupler
optical
directs
portion
laser
beam
photo
sensor
light
reflected
output
processed
coupled
phase
sensitive
detector
shift
drive
signal
creating
detected
information
determine
properties
elasticity
inhomogeneity
resulting
structure
easily
compact
portable
easy
align
mechanical characteristics
apparatus employs
field gradient
light reflected
fiber optics
phase shift
electric field
fiber optic
laser beam
optical fiber
mechanical properties
surface tension
detected signal
sensitive detector
alternating electric
phase sensitive
drive signal
directs light
interferometric detection
capillary wave
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