Analysis of development tendencies of metrological technologies to control rangefinders of an electronic distance measurement instruments

The article analyses the development of metrological control technologies for electronic distance measurement rangefinders to determine their main characteristic of accuracy – the root mean square error of distance measurement. It is established that the current reference linear bases are reliable and serve as the main means of transmitting a unit of length from the standards to the working means of measuring length. The article describes the existing linear reference bases and specifies their accuracy and disadvantages. It is concluded that the disadvantages of linear reference bases are deprived of the reference linear bases built in special laboratories. They use distances measured by the differential method with laser interferometers as reference distances. The application of such technology allowed to automate the processes of measurements and calculations. There is development of fibre-optic linear bases, in which optical fibres of known length are used as model lines. The article offers a new technical solution – a combination of fiber-optic and interference linear bases, which allows to qualitatively improve the system of metrological support of laser rangefinders. This is achieved by having a fiber-optic unit, which allows you to create baselines of increased length, while ensuring small dimensions of the baseline, and relative interference base, which provides high accuracy of linear measurements and does not require calibration of the base with a precision rangefinder, which eliminates several difficulties associated with changes in the refractive index, makes measurements independent of the wavelength of the radiation source and almost independent of the ambient temperature

Device for automated leveling

The article describes the issue of automation of surface leveling performed during the reconstruction of artificial aerodrome covers. The existing methods of surface leveling using satellite technologies, electronic (digital) and laser rotational levels are described. The main drawbacks of existing methods are analyzed, the essence of which is reduced mainly to the large amount of manual measurements. A new mobile device for automated surface leveling is proposed, the distinctive parts of which are mobile platform, leveling optoelectronic device (LOED) and ultrasonic location block. The LOED includes lenses and a double Charge-Coupled Device (CCD) Matrix. To perform the leveling of the surface in the leveling marking the ends of the leveling lines, which are parallel to the longitudinal axis of the leveling plot is done. The leveling lines fix two points (benchmarks) where elevation points are first-order as compared with elevation points of leveling the surface. Two reference sighting targets on the benchmarks are installed. In the memory of the device such data as: instrumental elevations, elevations LOED and elevations sighting targets, as well as the scanning step are entered. The device LOED is installed to the alignment between sighting targets the position in the alignment of the images of targets on the display are controlled. The device is installed sequentially to the points of scanning the surface along the alignment line and define the readings on the LOED matrixes at the points of leveling the surface during stops or movement of the device on the alignment line. As a result of measurements in automatic mode, the instrumental elevations along the alignment line with an adjustable scan step are obtained. Such a device due to increased mobility is effective for leveling large and length areas, such as take-off and landing strip, take-off starts, airplane platforms, etc

Device for automated leveling

The article describes the issue of automation of surface leveling performed during the reconstruction of artificial aerodrome covers. The existing methods of surface leveling using satellite technologies, electronic (digital) and laser rotational levels are described. The main drawbacks of existing methods are analyzed, the essence of which is reduced mainly to the large amount of manual measurements. A new mobile device for automated surface leveling is proposed, the distinctive parts of which are mobile platform, leveling optoelectronic device (LOED) and ultrasonic location block. The LOED includes lenses and a double Charge-Coupled Device (CCD) Matrix. To perform the leveling of the surface in the leveling marking the ends of the leveling lines, which are parallel to the longitudinal axis of the leveling plot is done. The leveling lines fix two points (benchmarks) where elevation points are first-order as compared with elevation points of leveling the surface. Two reference sighting targets on the benchmarks are installed. In the memory of the device such data as: instrumental elevations, elevations LOED and elevations sighting targets, as well as the scanning step are entered. The device LOED is installed to the alignment between sighting targets the position in the alignment of the images of targets on the display are controlled. The device is installed sequentially to the points of scanning the surface along the alignment line and define the readings on the LOED matrixes at the points of leveling the surface during stops or movement of the device on the alignment line. As a result of measurements in automatic mode, the instrumental elevations along the alignment line with an adjustable scan step are obtained. Such a device due to increased mobility is effective for leveling large and length areas, such as take-off and landing strip, take-off starts, airplane platforms, etc

Device for automated leveling

The article describes the issue of automation of surface leveling performed during the reconstruction of artificial aerodrome covers. The existing methods of surface leveling using satellite technologies, electronic (digital) and laser rotational levels are described. The main drawbacks of existing methods are analyzed, the essence of which is reduced mainly to the large amount of manual measurements. A new mobile device for automated surface leveling is proposed, the distinctive parts of which are mobile platform, leveling optoelectronic device (LOED) and ultrasonic location block. The LOED includes lenses and a double Charge-Coupled Device (CCD) Matrix. To perform the leveling of the surface in the leveling marking the ends of the leveling lines, which are parallel to the longitudinal axis of the leveling plot is done. The leveling lines fix two points (benchmarks) where elevation points are first-order as compared with elevation points of leveling the surface. Two reference sighting targets on the benchmarks are installed. In the memory of the device such data as: instrumental elevations, elevations LOED and elevations sighting targets, as well as the scanning step are entered. The device LOED is installed to the alignment between sighting targets the position in the alignment of the images of targets on the display are controlled. The device is installed sequentially to the points of scanning the surface along the alignment line and define the readings on the LOED matrixes at the points of leveling the surface during stops or movement of the device on the alignment line. As a result of measurements in automatic mode, the instrumental elevations along the alignment line with an adjustable scan step are obtained. Such a device due to increased mobility is effective for leveling large and length areas, such as take-off and landing strip, take-off starts, airplane platforms, etc