Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
  • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
  • G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
  • G01F23/72—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using magnetically actuated indicating means
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
  • G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
  • G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
  • G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
  • G01F23/296—Acoustic waves
  • G01F23/2968—Transducers specially adapted for acoustic level indicators
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
  • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
  • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
  • G01F23/64—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements
  • G01F23/68—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats of the free float type without mechanical transmission elements using electrically actuated indicating means
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
  • G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
  • G01S15/06—Systems determining the position data of a target
  • G01S15/08—Systems for measuring distance only
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
  • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
  • G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
  • G01S7/52004—Means for monitoring or calibrating
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
  • G10K11/02—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators
  • G10K11/025—Mechanical acoustic impedances; Impedance matching, e.g. by horns; Acoustic resonators horns for impedance matching

Definitions

• the invention relates to a device for measuring a distance by means of an ultrasound transducer.
• a length and temperature measuring device in particular for tank systems or the like, which has a tracking device with a float outside a measuring tube, with which a cylindrical reflector with a through hole in the measuring tube is kept constantly at the level of the filling material .
• An ultrasonic transmitter / receiver is attached to both ends of the measuring tube. The sound waves are either reflected by the reflector or they run through the entire length of the measuring tube, so that the level and temperature of the product can be inferred from the determined transit times.
• the disadvantage here is that two ultrasound transmitters / receivers are required, which has an unfavorable cost effect.
• an ultrasound distance meter which has an ultrasound transmitter and an ultrasound receiver in a separate arrangement, both transmitter and receiver with their recessed ultrasound-sensitive surfaces and a specially selected horn. Geometry prevents a coupling between transmitter and receiver from occurring and thereby undesirably influence the signal / interference signal ratio.
• the method described is only suitable for measuring small distances.
• FIG. 1 Principle of the measuring arrangement in a schematic representation.
• Fig. 2 Exemplary embodiment of a converter housing in section.
• Fig. 3A First exemplary embodiment of an intermediate pipe section.
• Fig. 3B Second exemplary embodiment of an intermediate pipe section.
• Fig. 3C Third exemplary embodiment of an intermediate pipe section
• a measuring tube 1 shows the principle of the measuring arrangement in a schematic representation.
• a measuring tube 1 is installed vertically by means of a flange 2 in a container, preferably in a tank system.
• an ultrasound transmitter / receiver consisting of an ultrasound transducer 3, a transducer housing 4, and a temperature detection unit
• the driver unit 6 contains the means necessary to excite the ultrasonic transducer 3, as well as those for processing the transmit and receive signals thereof and means for operating the temperature detection unit 5 and processing its temperature signals. On the driver unit
• the sound wave generated and emitted by the ultrasonic transducer 3 is coupled into the measuring tube 1 via an intermediate tube piece 7 and reflected on the reflector surface 8 of the reflector 9, as a result of which part of the sound wave falls back on the ultrasonic transducer 3, which now works as a receiver.
• the returning and returning sound wave is recorded by means of a transit time measurement and evaluated in a known manner to determine a distance.
• At least one temperature sensor 10 is arranged in the intermediate pipe section 7 and is connected to the temperature detection unit 5 via the supply lines 11 is.
• the temperature sensor 10 can also be arranged at another point in the device, for example in the area of the measuring tube 1, in which a plurality of temperature sensors can also be arranged, which results in a better temperature overview.
• the measuring tube 1 is advantageously sealed at its lower end with a closure piece 12 so that no filling material can get into the interior of the measuring tube.
• the reflector 8 is adjusted by means of a float 13, which is provided with a ring magnet 14, in such a way that the reflector surface 9 corresponds to the respective fill level of the filling material in the container.
• the reflector 8 consists essentially of plastic, and in particular its reflector surface 9 is advantageously made of a reverberant, flat plastic.
• the measuring tube 1 is made of plastic or metal, for example polyvinyl chloride (PVC) or steel. It is preferably made of stainless steel, which guarantees extensive corrosion resistance.
• Fig. 2 shows an embodiment of the converter housing 4 shown in section.
• An 'environmental ultrasonic transducer' (polaroid) was used as the ultrasonic transducer 3, which had outer dimensions of 10 mm x 38.5 mm. This was inserted into the converter housing 4 and clamped in by screwing the converter housing 4 to the intermediate tube piece 7.
• 3A shows a first exemplary embodiment of the intermediate tube piece 7 in section. It is made from a piece of aluminum and, according to the invention, has the following three zones: an inlet funnel 20, a cylinder part 21 and an outlet funnel 22. The design of these three zones is essential for optimum sound propagation [transmission] and must be matched to one another in their constructional dimensions become.
• the diameter of the outlet funnel 22 on the eating tube side is matched to the inside diameter of the measuring tube, so that there are no joints.
• the intermediate tube piece 7 is screwed to the measuring tube 1.
• the intermediate pipe section 7 is described in detail:
• the input funnel 20 has a diameter of on the sensor side
• the cylinder part 21 has a diameter of 20 mm and one
• the output funnel 22 has a diameter of on the sensor side
• Measuring tube axis results.
• 3B shows a second exemplary embodiment of the intermediate tube piece 7 in section.
• the inlet funnel 20 has a diameter of 38.5 mm on the sensor side and tapers to 28 mm, a cone length of approximately 4.7 mm resulting in a cone angle of approximately 48 degrees to the measuring tube axis.
• the cylinder part 21 has a diameter of 28 mm and a length of 18.3 mm.
• the outlet funnel 22 has a diameter of 28 mm on the sensor side and widens to 38.5 mm on the measuring tube side, a cone length of 43 mm resulting in a cone angle of approximately 7 degrees to the measuring tube axis.
• 3C shows a third embodiment of the intermediate tube piece 7 shown in section.
• the input funnel 20 has a diameter of 38.5 mm on the sensor side and tapers to 18 mm, a cone length of approximately 21 mm resulting in a cone angle of approximately 26 degrees to the measuring tube axis.
• the cylinder part 21 has a diameter of 18 mm and a length of 20 mm.
• the outlet funnel 22 has a diameter of 18 mm on the sensor side and widens to 38.5 mm on the measuring tube side, a cone length of 25 mm resulting in a cone angle of approximately 22 degrees to the measuring tube axis.
• the specified resolution ⁇ S relates to the measured actual distance.
• the inventive distinction of the intermediate tube piece 7 enables an optimal coupling of the ultrasonic transducer 3 to the measuring tube 1, as a result of which a complex and complex processing of the echo signals, in particular the elimination of interference signals, can essentially be dispensed with.
• the solution to the problem according to the invention is characterized by high accuracy and high Resolution over a large distance range, due to a low power requirement in the driver unit, and due to a small amount of circuitry, since there is no need for complex processing of echo signals.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Remote Sensing (AREA)
• Radar, Positioning & Navigation (AREA)
• Acoustics & Sound (AREA)
• Fluid Mechanics (AREA)
• Computer Networks & Wireless Communication (AREA)
• Electromagnetism (AREA)
• Thermal Sciences (AREA)
• Multimedia (AREA)
• Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
• Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
• Length Measuring Devices Characterised By Use Of Acoustic Means (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4200959

Family Applications (1)

Country Status (5)

Cited By (1)

Families Citing this family (3)

Citations (4)

• 1992
  • 1992-03-31 CH CH1036/92A patent/CH681914A5/de not_active IP Right Cessation
• 1993
  • 1993-03-25 AT AT93905145T patent/ATE143130T1/de not_active IP Right Cessation
  • 1993-03-25 DE DE59303843T patent/DE59303843D1/de not_active Expired - Fee Related
  • 1993-03-25 WO PCT/CH1993/000084 patent/WO1993020412A1/de not_active Ceased
  • 1993-03-25 EP EP93905145A patent/EP0587834B1/de not_active Expired - Lifetime

Patent Citations (4)

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