[특허]Threshold setting for a radar level transmitter

[미국특허] Threshold setting for a radar level transmitter 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G01B-021/18 G01F-023/00
출원번호	UP-0667297 (2000-09-22)
등록번호	US-7542866 (2009-07-01)
발명자 / 주소	Lovegren, Eric R. Diede, Kurt C. Carlson, Ryan R.
출원인 / 주소	Rosemount Inc.
대리인 / 주소	Westman, Champlin & Kelly, P.A.
인용정보	피인용 횟수 : 7 인용 특허 : 40

초록 ▼

Disclosed is a method and apparatus for setting threshold values for use by a radar level transmitter to detect reflected wave pulses corresponding to portions of a transmitted microwave pulse which reflect from interfaces contained in a container. The present invention estimates these threshold values based upon various parameters. Some of these parameters can relate to properties of the materials forming the interfaces while others relate to properties of the antenna and user-defined parameters.

대표청구항 ▼

What is claimed is: 1. A radar level transmitter for providing level detection of materials in a container, the transmitter comprising: an antenna; a transceiver coupled to the antenna and configured to transmit a microwave pulse, having a transmit pulse amplitude, using the antenna and produce a signal representing reflected wave pulses; a microprocessor system coupled to the transceiver and adapted to control the transceiver and process the signal; a threshold calculation module executable by the microprocessor system and adapted to receive information related a dielectric constant of a first material and a dielectric constant of a second material and calculate an estimated fiducial pulse amplitude related to a reflected wave pulse from an interface between the antenna and the first material and an estimated first pulse amplitude related to a reflected wave pulse from a first material interface between the first material and the second material, the threshold calculation module further adapted to set a fiducial threshold value based upon the estimated fiducial pulse amplitude and set a first threshold value based upon the estimated first pulse amplitude; and a level calculation module executable by the microprocessor system and adapted to establish a level in the container of the first material interface using the signal, the fiducial threshold value and the first threshold value. 2. The radar level transmitter of claim 1, wherein: the threshold calculation module is further adapted to calculate a second threshold value as a function of the transmit pulse amplitude and the information related to a dielectric constant of a third material; and the level calculation module is further adapted to calculate a level of a second material interface between the second material and the third material using the signal and the second threshold value. 3. The radar level transmitter of claim 2, wherein the second threshold is calculated as a function of at least one of an attenuation factor and a range factor. 4. The radar level transmitter of claim 1, including an input/output port adapted to transmit a level output that is indicative of the first material interface. 5. The radar level transmitter of claim 1, including a dielectric constant calculator adapted to calculate a dielectric parameter relating to one of the first and second materials as a function of the transmit pulse amplitude and a first reflected wave pulse corresponding to a portion of the microwave pulse reflected at the first material interface, and provide the dielectric parameter to the threshold calculation module for use in establishing the level of the first material interface. 6. The radar level transmitter of claim 1, wherein the first threshold value is further calculated as a function of at least one of an attenuation factor and a range factor. 7. The radar level transmitter of claim 1, wherein the fiducial threshold value is further calculated as a function of at least one of an attenuation factor and a range factor. 8. The radar level transmitter of claim 1, wherein the first threshold value is further a function of at least one of an offset value and temperature. 9. The radar level transmitter of claim 1, wherein the first threshold value is calculated as a function of a correction factor. 10. The radar level transmitter of claim 1 wherein the dielectric constants of the materials are received from an operator. 11. The radar level transmitter of claim 1 wherein the dielectric constants of the materials are received over a process control loop. 12. The radar level transmitter of claim 1 wherein the first threshold value is further calculated as a function of a temperature.

이 특허에 인용된 특허 (40) 인용/피인용 타임라인 분석

Burkett Douglas A., Apparatus and method for optically sensing liquid level in cooking vessels.
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Ross Gerald F. (Lexington MA), Apparatus and method for sensing a liquid with a single wire transmission line.
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Nelson Steven D. (Bradenton FL) Champion James R. (Sarasota FL) Leonard James S. (Parrish FL), Apparatus and method for sensing fluid level.
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Rao B. Rama (Lexington MA) Robbins Kenneth W. (Wilmington MA), Apparatus and method of measuring the level of a liquid.
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Hook William R.,CAX, Apparatus and methods for time domain reflectometry.
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McEwan Thomas E. (Livermore CA), Electronic multi-purpose material level sensor.
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Rost David P., False alarm rate and detection probability in a receiver.
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Westrom Arthur C. (Stone Mountain GA) Larsen James W. (Suwanee GA), Fault distance locator for underground cable circuits.
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McEwan Thomas E. (Livermore CA), High accuracy electronic material level sensor.
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Johnson Walter J. (Renton WA), ID microwave holographic sensor.
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Marchand, J. F. Phillippe, Integrated dipole detector for microwave imaging.
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Diede Kurt C., Low power radar level transmitter having reduced ground loop errors.
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Kurt C. Diede, Measurement of process product dielectric constant using a low power radar level transmitter.
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Oswald Gordon K. A. (Colne GBX) Uisi Per A. V. (Ely GBX) Orme Elizabeth A. (Barrington GBX) Lawrence Thomas W. J. (Cambridge GBX), Method and apparatus for determining a fluid level in the vicinity of a transmission line.
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Shuff ; Thomas J. ; Sims ; Robert W., Method and apparatus for level measurement using microwaves.
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Mowrey Gary L. (Jefferson Boro PA) Ganoe Carl W. (Pittsburgh PA) Monaghan William D. (Dravosburg PA), Method and apparatus for monitoring the thickness of a coal rib during rib formation.
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Sherman, James R.; Jones, Ray B.; Pruett, Barry B., Method for fabricating suspended transmission line.
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Broding Robert A. (Tulsa OK), Methods and apparatus for measuring a length of cable suspending a well logging tool in a borehole.
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Robert B. Welstand ; Timothy L. Leclair, Microwave to millimeter wave frequency substrate interface.
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Gau Jiahn-Rong,TWX ; Jan Cheng-Geng,TWX ; Liu Hsin-Tang,TWX ; Lee Cheng-Nan,TWX, Modularized multiple-feed electromagnetic signal receiving apparatus.
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Diede Kurt C. ; Richter Brian E., Multiple process product interface detection for a low power radar level transmitter.
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McEwan Thomas E., Precision short-range pulse-echo systems with automatic pulse detectors.
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Innes Sean C. ; Leonard James S. ; Reinhart Albert A. ; Champion James R., Probe for sensing fluid level.
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Kuipers Ulrich,DEX ; Barten Axel,DEX ; Kohlrausch Arnt,DEX, Process and measurement systems for measuring physical quantities of poorly conductive and nonconductive fluids.
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van der Pol Ronald (Venlo NLX), Process for measuring the level of fluid in a tank according to the radar principle.
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Jean Buford R. (College Station TX) Newton Richard W. (College Station TX) Blanchard Andrew J. (Arlington TX) Clark Billy V. (College Station TX) Warren Gary L. (Bryan TX), Radar tank gauge.
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Burger Stefen,DEX ; Fitsch Carsten,DEX, Radar-based method of measuring the level of a material in a container.
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Davis John Leslie,CAX, Roadway ground penetrating radar system.
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Cummings Donald D. (Greenwood IN) Wartmann Gerd (Greenwood IN) Perdue Kenneth L. (Franklin IN), Sensor apparatus for process measurement.
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Buckland Eric L. (Raleigh NC) Nishimura Masayuki (Durham NC), Simultaneous bi-directional optical time domain reflectometry method.
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Reddy ; III. William J. (Scottsdale AZ) Berkman Samuel (Sun Lakes AZ), TDR system and method for detecting leakage of a liquid.
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Haynes John S. (Greensboro NC), Tank gauging system and methods.
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Barr Thomas A. (Huntsville AL), Thickness measurement system.
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Carsella, Boyce; Faust, Anthony; Klinstein, Leo; Soroka, Lary; Twaddle, Mark, Time domain reflectometry measurement instrument.
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Champion James R., Time-based method and device for determining the dielectric constant of a fluid.
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Gnamm Bernhard (Charleston SC) Bareiss Alexander (Charleston SC), Tubular elastic frame with a continuous slot spanned by a filter material.
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John A. Kielb ; Scott D. Manicor, Two-wire level transmitter.
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Kielb John A. (Eden Prairie MN) Nelson Richard L. (Chanhassen MN) Manicor Scott D. (Minneapolis MN), Two-wire level transmitter.
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Haynes Kevin M. (Northlake IL) Margison Steven E. (Downers Grove IL), Ultrasonic level detector.
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이 특허를 인용한 특허 (7) 인용/피인용 타임라인 분석

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Savard, Stephane; Haran, Frank Martin, Pulse shape change for interface determination.
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Flasza, Michael D.; Tang, Feng; Page, Steven R., Time domain reflectometry based method for emulsion detection and profiling.
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[미국특허] Threshold setting for a radar level transmitter 원문보기

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[미국특허] Threshold setting for a radar level transmitter 원문보기

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