Fluorescent substance detection system

• US 9,810,632 B2
• Filed: 07/17/2014
• Issued: 11/07/2017
• Est. Priority Date: 07/17/2014
• Status: Active Grant

• Current Assignee: Koç University, Kuantag Nanoteknolojiler Gelistirme Ve Uretim A.S.
• Original Assignee: Koç University, Kuantag Nanoteknolojiler Gelistirme Ve Uretim A.S.
• Inventors: Urey, Hakan, Akgun, Osman Vedat, Heves, Emre, Civitci, Fehmi, Can, Basarbatu
• Primary Examiner(s): Porta, David
• Assistant Examiner(s): BOOSALIS, FANI POLYZOS
• Application Number:
  US15/326,995
• Publication Number:
  US 20170205346A1
• Time in Patent Office: 1,209 Days
• CPC Class Codes: G01N 2021/6421 Measuring at two or more wavelengths
• CPC Class Codes: G01N 2021/6484 Optical fibres
• CPC Class Codes: G01N 21/643 non-biological material
• CPC Class Codes: G01N 21/645 Specially adapted constructive features of fluorimeters
• CPC Class Codes: G01N 21/8507 Probe photometers, i.e. with optical measuring part dipped into fluid sample
• CPC Class Codes: G01N 2201/0624 Compensating variation in output of LED source
• CPC Class Codes: G01N 2201/0826 Fibre array at source, distributing
• CPC Class Codes: G01N 2201/0833 Fibre array at detector, resolving

Abstract

In the present invention, a fluorescent substance detection system (S) for detecting fluorescent substances in any environment is provided. Said detection system (S) comprises at least one illumination unit (1) which emits light to said environment in order to excite said substances; detection units (2), at least at a number equal to the number of types of fluorescent substances, for detecting emissions coming from said excited fluorescent substances and bandpass filters (3), each connected to detection units (2) one by one, wherein bandpass filters (3) have a center wavelength matched to the center emission wavelength of corresponding fluorescent substance.

Claims

1. A detection system adapted to detect tagging materials added in a tagged fluid in order to identify the tagged fluid, wherein the tagging materials are fluorescent substances having known discrete emission spectrums, existing as a mixture in the tagged fluid, wherein each of the fluorescent substances is used for coding information by employing different emission wavelengths and intensity levels to identify the tagged fluid which is highly absorbent and highly fluorescent, the detection system comprising:

at least one illumination unit which emits light to the tagged fluid in order to excite the fluorescent substances to generate discrete emission spectrums used for generating coding information, the light emitted from the at least one illumination unit also generating fluorescence emissions in the tagged fluid along with the discrete emission spectrums from the fluorescent substances;

detection units, at least at a number equal to the number of types of the fluorescent substances, for detecting emissions coming from the fluorescent substances;

bandpass filters paired with the detection units, wherein the bandpass filter of each detection unit matches a center emission wavelength of the discrete emission spectrum of one of the fluorescent substances;

at least one signal processing unit, connected to the detection units, to receive signals including the discrete emission spectrums of the fluorescent substances from the detection units and process the signals to decode the coding information in order to identify the tagged fluid; and

at least one background detector for detecting the fluorescent emissions of the tagged fluid, the at least one background detector being in connection with the at least one signal processing unit to apply dynamic background subtraction method to extract the fluorescent emissions only from the fluorescent substances and employ them to identify the tagged fluid.

2. The detection system of claim 1, wherein light emitted from the at least one illumination unit reaches to the tagged fluid by passing through the free space.

3. The detection system of claim 1, wherein emissions of the fluorescent substances reach to the detection unit by passing through the free space.

4. The detection system of claim 1 further comprising at least one excitation transmitter which transmits light emitted from the at least one illumination unit to the tagged fluid.

5. The detection system of claim 4 further comprising at least one collection transmitter which transmits emissions of the fluorescent substances to the detection unit.

6. The detection system of claim 5, wherein the at least one excitation transmitter and the at least one collection transmitter are in the form of light carriers.

7. The detection system of claim 6, wherein the at least one excitation transmitter and the at least one collection transmitter are in the form of fiber.

8. The detection system of claim 5, wherein the bandpass filters are coupled with the at least one collection transmitter.

9. The detection system of claim 5 further comprising a transmitting probe, wherein the at least one excitation transmitter, the at least one collection transmitter and the bandpass filters are placed in the transmitting probe.

10. The detection system of claim 9, wherein the transmitting probe comprises a compound parabolic concentrator.

11. The detection system of claim 1, wherein the at least one illumination unit comprises at least one light source for exciting the fluorescent substances.

12. The detection system of claim 11, wherein the at least one illumination unit further comprises at least one driver circuit for controlling the at least one light source.

13. The detection system of claim 12, wherein the at least one illumination unit further comprises a photodiode to monitor the output power of the at least one light source.

14. The detection system of claim 1, wherein the detection units comprise a photodetector read out circuitry.

15. The detection system of claim 1, wherein the detection units comprise at least one integration capacitor, which filters small fluctuations on the signal coming from the photodetector read out circuitry.

16. The detection system of claim 1 further comprising a single transmitter which is both used for transmitting light emitted from the at least one illumination unit to reach the tagged fluid and transmitting emissions of the fluorescent substances to reach the detection units.

17. The detection system of claim 16 further comprising dichroic mirrors for separating light from the at least one illumination unit and different wavelength fluorescent substances.

18. The detection system of claim 1 further comprising a reflective surface as the tagged fluid.

19. The detection system of claim 18, wherein the reflective surface is a spherical mirror.

20. The detection system of claim 18, wherein the reflective surface is an elliptical mirror.

21. A method for real time and online identification of a tagged fluid which is highly absorbent and highly fluorescent, the tagged fluid including tagging materials added in order to identify the tagged fluid, wherein the tagging materials are fluorescent substances mixed in the tagged fluid in order to identify the tagged fluid, and wherein the fluorescent substances are used for coding information by employing different emission wavelengths and intensity levels to identify the tagged fluid, the method comprising:

illuminating the tagged fluid containing the fluorescent substances with at least one illumination unit to generate fluorescence emissions, from the fluorescent substances and the tagged fluid, including discrete emission wavelengths from the fluorescent substances;

collecting the fluorescence emissions from the tagged fluid and the fluorescent substances;

detecting the discrete emission wavelengths using at least one detection unit by filtering the fluorescence emissions from the fluorescent substances using a bandpass filter;

transferring the readings of the at least one detection unit, including the fluorescence emissions from the fluorescent substances, to a signal processing unit;

collecting the fluorescence emissions of the tagged fluid through a background transmitter;

detecting the fluorescence emissions of the tagged fluid by filtering specific emission wavelengths and using a background detector; and

transferring the readings to the signal processing unit to apply dynamic background subtraction method for extracting the fluorescence emissions emitted from the fluorescent substances only to decode the coding information in order to identify the tagged fluid.

22. The method of claim 21, wherein the dynamic background subtraction method comprises:

measuring the fluorescence emissions of the tagged fluid using the background detector,

calculating the effect of the fluorescence emissions of the tagged fluid at the discrete emission wavelengths of the fluorescent substances, and

subtracting the effect of the fluorescence emissions of the tagged fluid at the discrete emission wavelengths of the fluorescent substances from the fluorescent substance emission measurement to extract the emissions coming from the fluorescent substances only.

23. The method of claim 22, wherein in the detecting step, linear fitting algorithm is applied to the increasing voltage waveform by calculating least squares regression line of the voltage.

24. The method of according to claim 22, wherein the tagged fluid is a liquid or gas medium.

25. The method of claim 22, wherein the tagged fluid is stationary or dynamic.

26. The method of claim 22, wherein the fluorescent substances are one or more organic light emitting molecules.

27. The method of claim 22, wherein the fluorescent substances are one or more quantum dots.

28. The method of claim 22, wherein the fluorescent substances are a combination of one or more organic light emitting molecules and one or more quantum dots.

29. The method of claim 22, wherein the fluorescent substances have a size between 10 to 1000 nm.

30. The method of claim 22, wherein the fluorescent substances have different emissions between 200-2000 nm.