Method and device for detecting and analyzing deposits

Patent metadata

Field	Value
Publication number	US-9587935-B2
Application number	US-201214367262-A
Country	US
Kind code	B2
Filing date	Dec 20, 2012
Priority date	Dec 22, 2011
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

The present invention relates to a method and device for detecting and analyzing deposits in liquid-bearing systems. More particularly, the device relates to being able to detect and analyze deposits in a liquid-bearing systems such as industrial plants that use and store fluids. The method relates to being able to determine a distribution of the run time of a detected ultrasonic reflection signal and analyzing the distribution to determine if deposits are deposited onto a reflecting area.

First claim

The invention claimed is:

1. A method for detecting and analyzing deposits on a reflecting area inside a liquid-bearing system, comprising the steps of:
emitting an ultrasonic emission signal towards the reflecting area by an ultrasonic transducer in a first step;
detecting an ultrasonic reflection signal obtained by reflection of the ultrasonic emission signal in the area of the reflecting area by detection means in a second step;
determining a distribution of a run time of the detected ultrasonic reflection signal in response to a specified variable in a third step; wherein the run time is calculated from the time difference between the time of detection and the time of emitting the ultrasonic emission signal;
analyzing the distribution in a fourth step in order to determine if deposits are deposited at least partially onto the reflecting area.

2. The method according to claim 1 , wherein the distribution is analyzed in the fourth step whether the distribution comprises a stationary point, an inflection point, a break point, a pole and/or a discontinuity.

3. The method according to claim 2 , wherein the distribution is analyzed for the distributions position, gradient and/or curvature of the distribution and/or the position of the stationary point, the inflection point, the break point, the pole and/or a discontinuity is analyzed in the fourth step.

4. A method for detecting and analyzing deposits on a reflecting area according to claim 3 , comprising the steps of:
emitting an ultrasonic emission signal towards the reflecting area by an ultrasonic transducer in a first step;
detecting an ultrasonic reflection signal obtained by reflection of the ultrasonic emission signal in the area of the reflecting area by detection means in a second step;
analyzing whether the detected ultrasonic reflection signal comprises different run times by an analyzing unit in a third step in order to determine if fouling and/or scaling deposits are deposited onto the reflecting area.

5. The method according to claim 4 , wherein a distribution of the different run times of the detected ultrasonic reflection signal is determined in the third step and the distribution is analyzed whether the distribution comprises a discontinuity in a fourth step.

6. The method according to claim 5 , wherein emission parameters of the ultrasonic transducer, detecting parameters of the detection means and/or analyzing parameters of the analyzing unit are modified in order to find the discontinuity in the distribution in the fourth step.

7. The method according to claim 6 , wherein the detected ultrasonic reflection signal is amplified by an amplifier of the analyzing unit in the third step, wherein the gain of the amplifier is adjusted during the fourth step in order to find the discontinuity wherein the gain is successively increased at least until the discontinuity is detected.

8. The method according to claim 7 , wherein the different run times are determined in dependency of a time of detection of the detected ultrasonic reflection signal in the third step, wherein the time of detection is determined by the time at which the detected ultrasonic reflection signal exceeds a threshold value, wherein the threshold value is adjusted during the fourth step in order to find the discontinuity wherein the threshold value is successively decreased at least until the discontinuity is detected.

9. The method according to claim 8 , wherein the ultrasonic emission signal is emitted by the ultrasonic transducer with a output power in the first step, wherein the output power is increased during the fourth step in order to find the discontinuity, wherein the output power is successively increased at least until the discontinuity is detected.

10. The method according to claim 9 , wherein a time offset in the distribution in the area of the discontinuity is determined in a fifth step in order to determine a thickness of the fouling deposits in a sixth step when the discontinuity is detected in the fourth step.

11. The method according to claim 6 , wherein the discontinuity in the distribution is detected by modifying the emission parameters, the detecting parameters and/or the analyzing parameters in a first substep of the fourth step, wherein a limited interval in the course of the distribution in which the discontinuity is located is determined in a second substep of the fourth step and wherein the emission parameters, the detecting parameters and/or the analyzing parameters are modified again only within the limited interval in a third substep of the fourth step, wherein only the limited interval is analyzed in order to determine a time offset in the fifth step.

12. The method according to claim 11 , wherein the thickness of the fouling deposits is determined by multiplying the time offset with an acoustic speed value in the sixth step, wherein the acoustic speed value represents the speed of sound in water or the speed of sound in fouling deposits.

13. The method according to claim 12 , wherein a certain acoustic speed value is used in dependence of an actual temperature in the sixth step and/or wherein an acoustic speed value is determined by measuring and/or estimating a speed of sound in fouling deposits in prior reference measurements.

14. The method according to claim 1 , wherein the run time is compared with a reference value in a seventh step in order to determine a thickness of the scale deposits when different run times are not detected in the third step and/or when a discontinuity is not detected in the fourth step.

15. A device for detecting and analyzing deposits in a reflecting area inside a liquid-bearing system, wherein the device-comprises an ultrasonic transducer for emitting an ultrasonic emission signal towards the reflecting area, a detection means for detecting an ultrasonic reflection signal obtained by reflection of the ultrasonic emission signal in the area of the reflecting area and an analyzing unit for determining a distribution of a run time of the detected ultrasonic reflection signal in response to a specified variable and for analyzing the distribution in order to determine if deposits are deposited at least partially onto the reflecting area; wherein the run time is calculated from the time difference between the time of detection 25 and the time of emitting the ultrasonic emission signal.

16. The device according to claim 15 , wherein the device is configured for modifying emission parameters of the ultrasonic transducer, detecting parameters of the detection means and/or analyzing parameters of the analyzing unit as the variable in order to determine the distribution.

17. A device for detecting and analyzing deposits in a reflecting area inside a liquid-bearing system, wherein the device comprises an ultrasonic transducer for emitting an ultrasonic emission signal-towards the reflecting area, a detection means for detecting an ultrasonic reflection signal-obtained by reflection of the ultrasonic emission signal in the area of the reflecting area and an analyzing unit for analyzing whether the detected ultrasonic reflection signal comprises different run times in order to determine if fouling and/or scaling deposits are deposited onto the reflecting area; and wherein the analyzing unit is configured for determining a distribution of the run time of the detected ultrasonic reflection signal, wherein the analyzing unit is further configured to analyze whether the distribution comprises a discontinuity in order to determine if fouling deposits and/or scaling deposits are deposited in the reflecting area.

Assignees

• Ashland Licensing & Ip Llc
• Solenis Tech Lp

Inventors

• Seida Frank
• Flocken Christian
• Bierganns Patric
• Schultz Michael

Classifications

• G01B17/02 Primary

  for measuring thickness · CPC title

• G01N2291/0237

  Thin materials, e.g. paper, membranes, thin films · CPC title

• G01N2291/044

  Internal reflections (echoes), e.g. on walls or defects · CPC title

• G01N29/44 Primary

  Processing the detected response signal {, e.g. electronic circuits specially adapted therefor (digital signal processing per se G06F17/00)} · CPC title

• G01N29/07

  by measuring propagation velocity or propagation time of acoustic waves · CPC title