RU2510488C2 - Inclinometre - Google Patents

Abstract

FIELD: instrumentation.

SUBSTANCE: proposed device comprises light source, flask with fluid with surface located on light path and recorder of light beam reflected from fluid surface. Note here that all said elements share a common base frame. Note also that light source is composed by single-mode stabilised laser source. Said flask contains thick dielectric fluid, for example, flask oil with fluid ply depth-to-flask diametre makes 0.04 to 0.06. Said recorder is composed by position-sensitive photoreceiver with recording unit. Base frame inclination is defined as the change in position of laser beam spot reflected from fluid surface at said position-sensitive photoreceiver.

EFFECT: better stabilisation of large-scale industrial or research complexes, au, International linear collider, state-of-the-art telescopic systems, etc.

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Description

The device relates to the field of technical physics and can be used to stabilize the position of research facilities, for example, metrological facilities with long laser reference lines, linear colliders (ILC, CLIC), large telescopes, etc., and can also be a detecting device for tilting the earth's surface. seismic and industrial origin.

A device (analog) is known by application No. 74770, published 01/01/1949 for measuring slope. The device contains a cell with a dielectric fluid, which is placed between the plates of two capacitors. The disadvantage of this device is its low sensitivity and high noise level.

A device (analog) is known according to the application No. 2089852, published on 09/10/1997, for measuring the inclination relative to the horizon. The device contains a light source, a floating body with a glass plate attached to it in the form of a thin glass disk with a goniometric scale deposited on it, and a telescope with an eyepiece.

The disadvantage of this device is the low sensitivity to the measured angular slopes, the residual non-horizontalness of the floating body, limiting the scope of the device.

A device (prototype) is known that contains a light source, a telescope with an eyepiece and a cuvette in the form of a transparent sealed cylinder, partially filled with liquid (US patent N 2782675 О ce Feb 26 1957).

The disadvantages of this device are the lack of sensitivity, a large level of noise, the need for visual observation of the reflected light beam, which limits its scope.

An object of the present invention is to radically increase the sensitivity while reducing the noise of the device. This is necessary both for stabilization of the position of the laser beam in space over large (over 100 m) distances, and for precise stabilization of the position of large research facilities (linear accelerators, large-diameter telescopic systems, etc.) from seismic noise from the earth and industrial origin.

The problem is solved in that in a device for measuring the angle of inclination, which includes a light source, a cuvette with a liquid, the surface of which is installed in the path of the light, recording a device of a light beam reflected from the surface of the liquid, a base common to all elements is introduced, the light source is made in the form of a single-mode stabilized laser source, the cuvette is filled with a viscous dielectric fluid, such as oil, with the ratio of the thickness of the liquid layer in the cuvette to the diameter of the cuvette in the range from 0.04 to 0 .06, the recording device is made in the form of a position-sensitive photodetector with a registration unit, measuring the angle of inclination of the base as a change in the position of the spot reflected from the liquid surface of the laser beam on a position-sensitive photodetector.

The common base increases the stability of the relative positions of the elements of the device. A stabilized single-mode laser source increases the sensitivity and accuracy of measuring the angle of inclination of the base due to the symmetrical distribution of the power density in the beam cross section, the absence of intermode beat noise, and the stabilization of radiation power, which increases the accuracy of position measurement on a position-sensitive photodetector. A cell with a viscous polar liquid (oil) with a ratio of the thickness of the liquid layer to the diameter of the cell from 0.04 to 0.06 provides a stable geometric position of the surface layer of the liquid with no surface noise sound waves and no evaporation. A positionally sensitive photodetector (PFC) with a recording electronic device (ADC) and a computer for recording the received information provides continuous monitoring of the angular position of the Earth's surface in two angular coordinates.

Figure 1 shows a diagram of the device, where 1 is a laser, 2 is a base, 3 is a cell with a liquid, 4 is a position-sensitive photodetector, 5 is an output laser beam, 6 is a laser beam reflected from the surface, 7 is offset from the original position due to the inclination of the base of the laser beam, 8 - the position of the liquid surface to the angular inclination of the base, 9 - the position of the surface of the liquid after the inclination of the base. The inclination of the surface of the liquid and the reflected laser beam are shown relative to the base.

The device operates as follows. A single-mode stabilized laser source (1) sends its beam to the surface of the liquid in the cell (3). A beam reflected from the surface of the liquid is detected by a position-sensitive device (4). All elements (1, 3, 4) are fixed on a common base (2) located on the surface of the Earth. The signal about the position of the beam on the PFC is recorded by an analog-to-digital converter and recorded on a computer.

When the earth is tilted, the base tilts (2). Due to the fact that the horizontal position of the liquid does not change, the angular position of the reflected laser beam (7) changes by a doubled angle of inclination of the base φ = 2θ (8, 9) relative to the previous position of the beam (6), which causes the laser beam to shift on the position-sensitive photodetector, resulting in linear with respect to the angle of inclination of the base change in the magnitude of the recorded signal.

During the measurement process, the device is calibrated by measuring the inclination of the base, which makes it possible to represent the recorded signal in units of the angle of inclination of the base.

The received signal is subsequently used to stabilize the position of both the laser reference line and the position of precision research facilities.

Also, the received signal is an additional channel of information on Earth tectonics. Signal registration solves the problem of accurately determining the amplitude and direction of surface seismic waves in the form of a periodic inclination of the earth's surface. In fact, the device in question is a new type of seismograph of surface seismic waves.

Claims (1)

A device for measuring the angle of inclination, including a light source, a cuvette with a liquid, the surface of which is installed in the path of the light, registering a light beam reflected from the surface of the liquid, characterized in that there is a base common to all elements, the light source is made in the form of a single-mode a stabilized laser source, a cuvette with a viscous dielectric fluid, for example oil, with the ratio of the thickness of the liquid layer in the cuvette to the diameter of the cuvette in the range from 0.04 to 0.06, recording a device in is designed as a position-sensitive photodetector with a recording unit that measures a base tilt angle as a change in position of spots reflected from the liquid surface of the laser beam on the position-sensitive photodetector.