A settlement monitoring system 1 for a construction site 400, the system 1 comprising an elongate liquid vessel 100, a continuous body of liquid 110 within the vessel 100, a first sensor 201 housed within a first portion of the vessel, and at least one additional sensor 202 206 housed within a second portion of the liquid vessel 100, wherein the sensors 201-206 are submerged within the liquid 110 and each sensor 201-206 is capable of detecting a pressure of the liquid 110, wherein in use the first portion of the liquid vessel 100 is configured to be situated at a known reference point of the site 400, the second portion is configured to be embedded within the ground 416, and the pressures are communicated to a surface system 308, the surface system 308 being configured to record the pressures.

An undershot gate system controls flow of liquid through an open channel or pipe. The system includes a gate leaf adapted to be raised and lowered by a control to allow flow of liquid along the open channel or pipe. The gate leaf has a flow diverter at an end of the gate leaf to guide liquid under the gate leaf and through an opening when the gate leaf is in an open position.

Heights of components or parts thereof are measured within a printing machine by measuring their relative rather than absolute heights. A virtual surface may be constructed from the measured heights, with a tolerance level employed based on the virtual surface. The invention is particularly suited to measurement of tooling components within a printing machine, such as tooling pins.

According to one embodiment, an inspection device includes a stage on which a substrate having a protrusion portion on a surface thereof is mountable. A ring member presses an outer periphery of the substrate on the stage. A liquid supply unit supplies a liquid on the surface of the substrate from the surface thereof to a first height. An imaging unit captures an image of a surface of the liquid and the protrusion portion from above the surface of the substrate. An arithmetic operation unit determines a size of an exposed portion of the protrusion portion which is exposed from the surface of the liquid by using the image obtained from the imaging unit, and determines a height of the protrusion portion on the basis of the size of the exposed portion.

According to one embodiment, an inspection device includes a stage on which a substrate having a protrusion portion on a surface thereof is mountable. A ring member presses an outer periphery of the substrate on the stage. A liquid supply unit supplies a liquid on the surface of the substrate from the surface thereof to a first height. An imaging unit captures an image of a surface of the liquid and the protrusion portion from above the surface of the substrate. An arithmetic operation unit determines a size of an exposed portion of the protrusion portion which is exposed from the surface of the liquid by using the image obtained from the imaging unit, and determines a height of the protrusion portion on the basis of the size of the exposed portion.

The invention relates to the field of height measurement, disclosing a method and a device for improving the stability of height difference measurement based on a corrugated tube. The method comprises: improving the structural stability of a height difference measuring device between a first pressure sensor and a second pressure sensor, obtaining the structural stability improvement result; collecting a first pressure from the first pressure sensor, detecting whether the first pressure is affected by external interference; when the first pressure is not affected by external interference, performing pressure screening on the first pressure to obtain a screening pressure, and calculating a first pressure average value of the screening pressure; collecting a second pressure from the second pressure sensor, calculating a second pressure average value of the second pressure; based on a historical pressure average value of the second pressure sensor, detecting the pressure accuracy of the second pressure average value; when the pressure accuracy is accurate, updating the second pressure by utilizing the second pressure average value to obtain an updated pressure; calculating the dynamic height difference of the height difference measuring device, utilizing the dynamic height difference to determine a dynamic stability improvement result of the height difference measuring device. The invention can ensure the stability of pressure measurement.

Heights of components or parts thereof are measured within a printing machine by measuring their relative rather than absolute heights. A virtual surface may be constructed from the measured heights, with a tolerance level employed based on the virtual surface. The invention is particularly suited to measurement of tooling components within a printing machine, such as tooling pins.

The invention relates to the field of height measurement, disclosing a method and a device for improving the stability of height difference measurement based on a corrugated tube. The method comprises: improving the structural stability of a height difference measuring device between a first pressure sensor and a second pressure sensor, obtaining the structural stability improvement result; collecting a first pressure from the first pressure sensor, detecting whether the first pressure is affected by external interference; when the first pressure is not affected by external interference, performing pressure screening on the first pressure to obtain a screening pressure, and calculating a first pressure average value of the screening pressure; collecting a second pressure from the second pressure sensor, calculating a second pressure average value of the second pressure; based on a historical pressure average value of the second pressure sensor, detecting the pressure accuracy of the second pressure average value; when the pressure accuracy is accurate, updating the second pressure by utilizing the second pressure average value to obtain an updated pressure; calculating the dynamic height difference of the height difference measuring device, utilizing the dynamic height difference to determine a dynamic stability improvement result of the height difference measuring device. The invention can ensure the stability of pressure measurement.

A settlement monitoring system 1 for a construction site 400, the system 1 comprising an elongate liquid vessel 100, a continuous body of liquid 110 within the vessel 100, a first sensor 201 housed within a first portion of the vessel, and at least one additional sensor 202-206 housed within a second portion of the liquid vessel 100, wherein the sensors 201-206 are submerged within the liquid 110 and each sensor 201-206 is capable of detecting a pressure of the liquid 110, wherein in use the first portion of the liquid vessel 100 is configured to be situated at a known reference point of the site 400, the second portion is configured to be embedded within the ground 416, and the pressures are communicated to a surface system 308, the surface system 308 being configured to record the pressures.