Pressure sensor including height determination with improved flexibility and reliability

Patent metadata

Field	Value
Publication number	US-11428595-B2
Application number	US-202016998972-A
Country	US
Kind code	B2
Filing date	Aug 20, 2020
Priority date	Aug 21, 2019
Publication date	Aug 30, 2022
Grant date	Aug 30, 2022

Abstract

A device for determining the relative heights between two points in direction gravity acts and inclination sensor for single- or multi-axis determination of an inclination relative to the vertical direction defined by the gravitational field. The device can include: a connecting hose filled with a liquid; a first and a second pressure sensor arranged at opposite ends of the hose; a processor to determine a relative height between a first reference point with a fixed positional relationship to the first pressure sensor and a second reference point with a fixed positional relationship to the second pressure sensor; a synchronizer; a respective wireless module at each of the hose. The synchronizer can synchronize a first time point with a second measurement time point, wherein the processor is configured to assign the measured hydrostatic pressures to the same, common measurement time point on the basis of the synchronized measurement time points.

First claim

The invention claimed is:

1. A device for determining relative heights between two points, the device comprising:
a connecting hose filled with a liquid, with two opposite ends;
a first and a second pressure sensor arranged at the opposite ends of the connecting hose, wherein the pressure sensors are connected to one another via the liquid and the liquid is sealed from the outside in a gastight manner by the connecting hose, and wherein the first pressure sensor is configured to measure a hydrostatic pressure of the liquid at the one end of the connecting hose in the liquid and the second pressure sensor is configured to measure a hydrostatic pressure of the liquid at the other end of the connecting hose that is opposite to the one end, in the liquid;
a synchronizer;
a respective wireless module at each end of the connecting hose; and
a processor configured to determine a relative height between a first reference point with a fixed positional relationship to the first pressure sensor and a second reference point with a fixed positional relationship to the second pressure sensor based on the hydrostatic pressures measured by the first and second pressure sensors, wherein the measured hydrostatic pressures are assigned by the processor to the same common measurement time point to the determination of the relative height,

wherein:
the synchronizer is configured to synchronize a first measurement time point at which the first pressure or temperature sensor measures with a second measurement time point at which the second pressure or temperature sensor measures, wherein the processor is configured to assign the measured hydrostatic pressures to the same, common measurement time point on the basis of the synchronized measurement time points,
the sensors are connected to the respective wireless module,
the wireless module is configured to receive and to process a wireless trigger signal, and
in that the synchronizer is configured to synchronize the measurement time points on the basis of a wireless trigger signal, so that the sensors measure pressure or temperature in a synchronized manner on the basis of the wireless trigger signal.

2. The device according to claim 1 , further comprising a first and a second temperature sensor, wherein
each of the temperature sensors is assigned to a pressure sensor,
the first temperature sensor is configured to measure the temperature at the first pressure sensor, in particular in the liquid,
the second temperature sensor is configured to measure the temperature at the second pressure sensor, in particular in the liquid, and
the processor is configured to determine the relative height also on the basis of the measured temperatures.

3. The device according to claim 1 , further comprising additional pressure sensors at each end of the connecting hose, wherein the pressure sensors at the respective end of the connecting hose are arranged around a common centre point and have a fixed positional relationship to one another, and wherein the processor is configured
to determine the relative height based on the mean values of the pressures measured by means of the pressure sensors at the respective end of the connecting hose, or
to determine an orientation of the respective end of the connecting hose in relation to a reference point on the basis of the pressures measured at the respective end of the connecting hose by means of the pressure sensors.

4. The device according to claim 1 , further comprising additional temperature sensors, wherein:
the connecting hose comprises multiple temperature measurement regions distributed over its length,
at least one of the further temperature sensors is assigned to each temperature measurement region,
the further temperature sensors are configured to measure the temperature in the assigned temperature measurement region, and
the processor is configured to determine the relative height also based on the temperatures measured in the temperature measurement regions of the connecting hose.

5. The device according to claim 1 , wherein the connecting hose:
comprises a first and a second hose compartment,
the hose compartments are separate from one another and extend adjacent to one another along the connecting hose,
the first hose compartment is filled with the liquid connecting the pressure sensors and the second hose compartment provides a circulation region for a medium that can move therein.

6. The device according to claim 1 , wherein the multiple reference points with a fixed positional relationship to the pressure sensor are assigned to a pressure sensor.

7. The device according to claim 1 , further comprising a respective orientation measuring module at both ends of the connecting hose, wherein the orientation measuring modules comprise at least one acceleration sensor and are configured to determine the orientation of the respective pressure sensor in relation to a reference point with a fixed positional relationship to the respective pressure sensor, and the processor is configured to determine the relative height on the basis of the orientation of the pressure sensors, or by a pressure compensating vessel at one end of the connecting hose, wherein the pressure compensating vessel is configured:
to establish and hold constant a base pressure in the connecting hose, or
to compensate for or limit an excess or negative pressure in the connecting hose with respect to an external air pressure.

8. The device according to claim 1 , further comprising:
an optical position-resolving detector (OAD) at one end of the connecting hose, wherein the optical OAD has a fixed positional relationship to the pressure sensor and is configured to detect optical reference radiation in a position-sensitive manner at an OAD point, and wherein the processor is configured to ascertain an OAD height between the pressure sensor and the OAD point, and to determine the relative height on the basis of the OAD height, or
a display or an input keyboard with operating fields at least one end of the connecting hose, wherein the processor is configured:
i. to display, at the respective end of the connecting hose, information relating to the measured temperatures and pressures, or
ii. to execute instructions that are input via the operating fields of the input keyboard, or

an optical distance measuring device with an inclination sensor at one end of the connecting hose, wherein the optical distance measuring device has a fixed positional and orientational relationship to the pressure sensor and is configured to measure absolute distances to targeted points by means of optical distance measuring radiation, and wherein the processor is configured to determine the relative height between the one first reference point and the point targeted by the optical distance measuring device on the basis of the determined relative height between the one first and the one second reference point, an inclination of the optical distance measuring radiation measured by means of the inclination sensor, and the distance measured to a targeted point, or
a coupling device at least one end of the connecting hose, wherein the coupling device is configured to couple and then uncouple further measuring devices, and to provide an accordingly coupled or uncoupled state to the processor as a coupling status,
an electronic identification mark at least one end of the connecting hose, and
a reading device for electronic identification marks,
wherein the processor is configured to determine a relative height also on the basis of at least one electronic identification mark read by the reading device and on the basis of the coupling status, or
a reflector at one end of the connecting hose, wherein the reflector comprises a re

Assignees

• Hexagon Technology Ct Gmbh

Inventors

• Hinderling Jürg
• Rebhandl Wolfgang
• Scheja Jochen
• Wenk Markus

Classifications

• G01C5/04

  Hydrostatic levelling, i.e. by flexibly interconnected liquid containers at separated points · CPC title

• G01L15/00

  Devices or apparatus for measuring two or more fluid pressure values simultaneously · CPC title

• G01L19/0092 Primary

  Pressure sensor associated with other sensors, e.g. for measuring acceleration or temperature (G01L9/025, G01L9/045, G01L9/065, G01L9/085, G01L9/105, G01L9/125, G01L19/02, G01L19/04 take precedence; measuring two or more variable G01D21/02; temperature sensors with pressure compensation G01K1/26) · CPC title

• G01D1/14

  giving a distribution function of a value, i.e. number of times the value comes within specified ranges of amplitude · CPC title