Optical detecting system
According to an embodiment of the present disclosure, provided is an optical detection system for detecting a laser speckle generated by multiple scattering of a wave irradiated toward a sample from a wave source, and based on a change in the laser speckle over time, detecting the presence of microbes in the sample in real time.
1. A pipe unit comprising:
a body portion comprising a first cross section, a second cross section facing the first cross section, and an inner surface penetrating the first cross section and the second cross section to form an inner space,
wherein the inner surface of the body portion comprises a multiple scattering amplification region in which is formed a pattern for amplifying the number of times a first wave incident between the first cross section and the second cross section in a fluid located in the inner space is multiply scattered, and
wherein:
the pattern is formed by arranging a plurality of grooves having a preset depth d from the inner surface at a preset interval Λ,
the depth d and the interval Λ of the pattern are determined based on a wavelength λ of the first wave, and
the depth d of the pattern is determined to satisfy the following equation:
λ
2
*
n
≤
d
wherein n is a refractive index of the fluid.
2. A pipe unit comprising:
a body portion comprising a first cross section, a second cross section facing the first cross section, and an inner surface penetrating the first cross section and the second cross section to form an inner space,
wherein the inner surface of the body portion comprises a multiple scattering amplification region in which is formed a pattern for amplifying the number of times a first wave incident between the first cross section and the second cross section in a fluid located in the inner space is multiply scattered, and
wherein:
the pattern is formed by arranging a plurality of grooves having a preset depth d from the inner surface at a preset interval Λ,
the depth d and the interval Λ of the pattern are determined based on a wavelength λ of the first wave, and
the interval Λ of the pattern is determined to satisfy the following equation:
1
Λ
=
sin
θ
λ
,
wherein θ denotes a scattering angle of the first wave scattered by the pattern.
3. The pipe unit of claim 1 , wherein
the body portion comprises one or more emission holes configured to guide a second wave emitted by being multiple scattered in the fluid to a detector.
4. The pipe unit of claim 3 , wherein
when two or more emission holes are formed, the two or more emission holes are arranged at different positions of the body portion.
5. An impurity detection system comprising: a pipe unit comprising a body portion formed with an inner space penetrating through a first cross section and a second cross section such that a fluid introduced through the first cross section is discharged through the second cross section and a multiple scattering amplification region configured to amplify the number of times a first wave incident between the first cross section and the second cross section in a fluid located in the inner space is multiply scattered;
a wave source configured to irradiate the first wave toward the fluid of the pipe unit;
a detector arranged outside the pipe unit and configured to detect a laser speckle generated by multiple scattering of the irradiated first wave in the fluid for each preset first time and
a controller configured to obtain a temporal correlation of the detected laser speckle using the detected laser speckle and estimate the presence of impurities in the fluid in real time based on the obtained temporal correlation,
wherein one or more emission holes, configured to guide a second wave emitted by being multiply scattered in the fluid to the detector, are formed in the body portion of the pipe unit.
6. The impurity detection system of claim 5 , wherein
the body portion comprises an inner surface surrounding the inner space,
wherein the multiple scattering amplification region is provided in the inner surface of the body portion and formed with a pattern for amplifying the number of times the first wave is multiply scattered, and
wherein the pattern is formed by arranging a plurality of grooves having a preset depth d from the inner surface at a preset interval Λ.
7. The impurity detection system of claim 6 , wherein
the depth d and the interval Λ of the pattern are determined based on a wavelength λ of the first wave.
8. The impurity detection system of claim 7 , wherein
the depth d of the pattern is determined to satisfy the following equation:
λ
2
*
n
≤
d
,
wherein n is a refractive index of the fluid.
9. The impurity detection system of claim 7 , wherein
the interval Λ of the pattern is determined to satisfy the following equation:
1
Λ
=
sin
θ
λ
,
wherein denotes θ scattering angle of the first wave scattered by the pattern.
10. The impurity detection system of claim 5 , wherein
the second wave emitted from the one or more emission holes has a power range of 1 mW/cm 2 or more in order for the detector to detect the laser speckle at a preset measurement speed or more.
11. The impurity detection system of claim 10 , wherein
the measurement speed of the detector is set such that a time for the fluid to pass through the one or more emission holes is greater than a time between first times.
12. The impurity detection system of claim 5 , wherein
when two or more emission holes are formed, the two or more emission holes are arranged at different positions along a circumferential direction of the body portion, and
the detector is provided to correspond to the number of the two or more emission holes.
13. The impurity detection system of claim 5 , wherein
the first wave has a wavelength range of 200 nm to 1.8 μm.