CN103322920B - A kind of measuring method of expansion of laser light displacement sensor measurement range - Google Patents

Abstract

A measuring method for expansion of laser light displacement sensor measurement range, there is laser displacement sensor light-sensitive surface on limit to test isosceles triangle two waist, the scope of object under test straight-line displacement is less than or equal to L, laser displacement sensor range is S ˊ, test isosceles triangle is arranged on object under test, test isosceles triangle base is parallel with object under test movement locus, laser displacement sensor is fixed on the top of test isosceles triangle, laser displacement sensor is fixed on the centre position in test isosceles triangle moving range, laser displacement sensor direction of measurement is perpendicular to the base of test isosceles triangle, the height on laser displacement sensor distance test isosceles triangle base is S and S≤S ˊ, laser displacement sensor can accurately measure the height H between test point to isosceles triangle hypotenuse, optoelectronic switch is arranged on the 1/2L place of distance object under test motion starting point.Structure of the present invention is simple, result accurate, fast response time, test specification are wide.

Description

A Measuring Method for Expanding the Measuring Range of Laser Displacement Sensor

technical field

The invention relates to laser displacement sensor technology, in particular to a measurement method for expanding the measuring range of the laser displacement sensor.

Background technique

The laser displacement sensor can accurately measure the position and displacement of the measured object without contact. The laser displacement sensor is widely used in various fields due to its advantages of good straightness, short response time, high frequency and high precision.

Laser displacement sensors have different measurement ranges due to different models. When the measured object exceeds the range of the current laser displacement sensor, it cannot be measured, and a laser displacement sensor with a higher range must be replaced. However, the price of the laser displacement sensor is relatively high. cause great waste. On the other hand, when it is necessary to use the same laser displacement sensor to measure two different displacements, a large range is required to meet the requirements at the same time, but when a large-range laser displacement sensor is used to measure small displacements, the resolution is low and the accuracy is poor.

Contents of the invention

In order to solve the problem of poor range applicability of the laser displacement sensor when measuring object displacement, the invention provides a measurement method for expanding the range of the laser displacement sensor with stronger applicability.

The technical solution adopted by the present invention to solve its technical problems is:

A measuring method for enlarging the measuring range of a laser displacement sensor, the testing device for realizing the testing method includes an isosceles triangle device for testing, the length of the base of the isosceles triangle device for testing is L, the height is S, and the clip between the waist and the base is The angle is β, and the photosensitive surface of the laser displacement sensor is arranged on the two waists of the isosceles triangle for the test;

The range of the linear displacement of the object to be measured is less than or equal to L, the range of the laser displacement sensor is S', the isosceles triangle for the test is installed on the object to be measured, and the bottom edge of the isosceles triangle for the test is connected to the motion track of the object to be measured Parallel, the laser displacement sensor is fixed above the isosceles triangle for testing, the laser displacement sensor is fixed at the middle position within the moving range of the isosceles triangle for testing, and the measurement direction of the laser displacement sensor is perpendicular to the isosceles triangle for testing The base of the isosceles triangle, the height of the laser displacement sensor from the base of the isosceles triangle for testing is S and S≤S', the laser displacement sensor can accurately measure the height H between the test point and the hypotenuse of the isosceles triangle, so The photoelectric switch is installed at 1/2L away from the starting point of the object to be measured, and the photoelectric switch can output positive and negative values according to whether there is a signal, as follows:

(1) When the photoelectric switch has a signal, the displacement of the object to be measured is D=(S-H)/tanβ.

(2) When the photoelectric switch has no signal, the displacement of the object to be measured is D=L-(S-H)/tanβ.

Design idea of the present invention: Utilize a right-angled triangle whose included angle and length of short right-angled side can accurately calculate the principle of its long right-angled side, adopt laser displacement sensor to measure the length of short right-angled side to calculate the length of long right-angled side, Thus, the measurement range of the laser displacement sensor is increased. During the test, it is only necessary to install an auxiliary triangle on the object to be measured. The angle between the long side and the hypotenuse is known, the short side is the range value of the laser displacement sensor, and the long side is The right-angled side is the displacement value of the object to be measured, the intersection point of the long right-angled side and the hypotenuse is the test starting point, the auxiliary triangle moves with the object to be measured, and the vertical height of the laser displacement sensor from the hypotenuse can be accurately measured by the laser displacement sensor , then subtract the measured value of the laser displacement sensor from the short right-angle side value of the auxiliary triangle to obtain the height value from the base of the current position to the hypotenuse. According to the Pythagorean theorem, the displacement of the auxiliary triangle can be calculated.

In order to facilitate mechanical installation, the auxiliary triangle is designed as an isosceles triangle. During the test, in order to prevent the laser displacement sensor from being located on the two hypotenuses, the measured value is the same. The photoelectric switch is used as the symbol position. According to the installation situation and whether the photoelectric switch has a reflection signal It can be determined whether the current laser displacement sensor is located on the left or right side of the isosceles triangle used for testing, and then the displacement of the object to be measured is calculated according to the measurement principle.

The invention has the beneficial effects of simple structure, accurate result, fast response speed and wide testing range.

Description of drawings

Figure 1 is a schematic diagram of an isosceles triangle to be tested.

Figure 2 is a schematic diagram of the measurement.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings.

With reference to Fig. 1 and Fig. 2, a kind of measuring method of enlarging the measuring range of laser displacement sensor, the test device that realizes this test method comprises test isosceles triangle 1, and described test is long with the bottom side of isosceles triangle device, height is S , the angle between the waist and the base is β, and the test isosceles triangle 1 has a laser displacement sensor photosensitive surface on the two waists;

The linear displacement range of the object to be measured is less than or equal to L, and the range of the laser displacement sensor is S'. The isosceles triangle 1 for the test is installed on the object to be measured, and the bottom edge of the isosceles triangle 1 for the test is parallel to the motion track of the object to be measured, as shown in Figure 2, the isosceles triangle for the test follows the object to be measured Moving from point B to point C, the laser displacement sensor is fixed above the isosceles triangle 1 for testing, and the laser displacement sensor is fixed at point A in the middle of the moving range of the isosceles triangle 1 for testing. The measurement direction of the displacement sensor is perpendicular to the base of the isosceles triangle 1 for testing, and the height of the laser displacement sensor from the base of the isosceles triangle for testing is S, and S≤S';

During the movement of the object to be tested, the laser displacement sensor can accurately measure the height H between the test point and the hypotenuse of the isosceles triangle, and the height S of the laser displacement sensor from the base minus H can obtain the base of the isosceles triangle for testing. The vertical height h from the side to the waist, i.e. h=S-H; when the object to be measured moves from point B to point A, the displacement of the object to be measured D, h and the hypotenuse of the isosceles triangle used for testing form a right triangle, so D =h/tanβ, that is, D=(S-H)/tanβ; when the object to be measured moves from point A to point C, the displacement of the object to be measured is L-h/tanβ, that is, D=L-(S-H)/tanβ, so The photoelectric switch is installed at point D which is 1/2L away from the starting point of the movement of the object to be measured, and the photoelectric switch can output positive and negative values according to whether there is a signal or not. When the photoelectric switch has a signal, the displacement of the object to be measured is D=(S-H)/tanβ; when the photoelectric switch has no signal, the displacement of the object to be measured is D=L-(S-H)/tanβ.

Claims (1)

1. a kind of measuring method of enlarging laser displacement sensor measuring range, it is characterized in that: the testing device realizing this measuring method comprises the isosceles triangle device for testing, and the isosceles triangle device base length for said test is L, and height is S, The included angle between the waist and the base is β, and there are laser displacement sensor photosensitive surfaces on the two waists of the isosceles triangle for the test; The range of the linear displacement of the object to be measured is less than or equal to L, the range of the laser displacement sensor is S', the isosceles triangle for the test is installed on the object to be measured, and the bottom edge of the isosceles triangle for the test is connected to the motion track of the object to be measured Parallel, the laser displacement sensor is fixed above the isosceles triangle for testing, the laser displacement sensor is fixed at the middle position within the moving range of the isosceles triangle for testing, and the measurement direction of the laser displacement sensor is perpendicular to the isosceles triangle for testing The bottom edge of the isosceles triangle, the height of the laser displacement sensor from the bottom edge of the isosceles triangle used for testing is S and S≤S', the laser displacement sensor can accurately measure the height H between the test point and the hypotenuse of the isosceles triangle, and the photoelectric The switch is installed at 1/2L away from the starting point of the object to be measured, and the photoelectric switch can output positive and negative values according to whether there is a signal, as follows: (1) When the photoelectric switch has a signal, the displacement of the object to be measured is D=(S-H)/tanβ; (2) When the photoelectric switch has no signal, the displacement of the object to be measured is D=L-(S-H)/tanβ.