	US 11,982,647 B2
	Ultrasonic measuring device
Oliver Berberig, Grenzach-Wyhlen (DE); Jens Rautenberg, Geseke (DE); Beat Kissling, Reinach (CH); Sascha Grunwald, Steinen (DE); Rudolf Braun, Ahorn (DE); Achim Stark, Dörfles/Esbach (DE); Klaus Beringer, Untersiemau (DE); Stefan Rüger, Jena (DE); and Theo Gerald Hofmann, Jena (DE)
Assigned to Endress+Hauser Flowtec AG, Reinach (CH)
Appl. No. 17/414,423
Filed by Endress+Hauser Flowtec AG, Reinach (CH)
PCT Filed Dec. 10, 2019, PCT No. PCT/EP2019/084423 § 371(c)(1), (2) Date Jun. 16, 2021, PCT Pub. No. WO2020/126671, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 10 2018 133 066.9 (DE), filed on Dec. 20, 2018.
Prior Publication US 2022/0091072 A1, Mar. 24, 2022
Int. Cl. G01N 29/24 (2006.01); G01F 1/66 (2022.01); G01F 1/86 (2006.01); G01N 29/024 (2006.01); G01N 29/44 (2006.01)

CPC G01N 29/2437 (2013.01) [G01N 29/4463 (2013.01); G01N 2291/02809 (2013.01); G01N 2291/02818 (2013.01); G01N 2291/0423 (2013.01); G01N 2291/0427 (2013.01)]

21 Claims

1. An ultrasonic measuring device for detecting a measurand of a medium, the measuring device comprising:

a measurement chamber, which includes a chamber wall defining a volume and has a chamber longitudinal axis;

at least one pair of ultrasonic transducers disposed on a first chamber side of the measurement chamber, wherein ultrasonic transducers of a pair of the at least one pair of ultrasonic transducers are configured to transmit ultrasound signals along an ultrasonic signal path between the ultrasonic transducers of the pair through the volume of the measurement chamber and to receive ultrasound signals, wherein the ultrasound signals have a central frequency,

wherein the ultrasonic signal path includes at least one ultrasound signal reflection on at least one reflection surface, wherein a reflection surface of the at least one reflection surface is disposed on an inner chamber surface of the chamber wall opposite the first chamber side; and

an electronic circuit configured to operate the at least one pair of ultrasonic transducers, to evaluate measurement signals generated by the at least one pair of ultrasonic transducers and to determine measurands of measurement errors,

wherein the chamber wall in a region of the reflection surface opposite the first chamber side is configured to prevent a reflection of an ultrasonic signal of a chamber outer surface of the chamber wall in a direction of the ultrasonic signal path,

wherein the chamber wall has, in the region of the reflection surface, a maximum wall thickness that is at least a first factor of 1.5 greater than a Rayleigh wavelength, associated with the central frequency, of the ultrasound signal in the chamber wall,

wherein the chamber outer surface includes at least one indentation in the region of the reflection surface, wherein the at least one indentation extends parallel to the chamber longitudinal axis and includes indentation surfaces that are non-parallel to the reflection surface, and

wherein an entirety of the at least one indentation has a width that corresponds at least to a width of the reflection surface multiplied by a second factor, which is greater than 0.7.