Optoelectronic device for measuring the length and curvature control pipes

 

The invention relates to the field of measurement technology and can be used for automated measurement of the linear dimensions of various objects, preferably the length and curvature of the pipe, for example, if a shop repair. The device comprises an electronic unit and an optical measuring head including a projection lens with a linear increase of the Bet, the focal length f, the relative distortionTheaboutand the angle W and connected with the electronic unit of the CCD-line with rectangular sensitive sites size And Century conditions Are Bet=B/d,Theabout<DTr/DTr.maxAnd=BetDTr, tg W=DTr.max/L AndN2f tg W, where d is the external diameter of the pipe, L is the distance from the JIU to the pipe, and N is the number of elements of the CCD line,DTr- the maximum permissible absolute error of measurement of the pipe length, DTr.maxmaximum measured length of the pipe. Provided to simplify the design by eliminating moving parts, enhancing performance and precision is their length and curvature of the controlled object. 2 Il.

Optoelectronic device for measuring the length and curvature control tubes the Invention relates to the field of measurement technology and can be used for automated measurement of the linear dimensions of various objects, preferably the length and curvature (tablewidget) tubes, for example, if a shop repair.

A device for measuring lengths of pipes (US 4701869), comprising a reflector mounted for movement on one end of the tube, the laser is mounted on the second end of the pipe can move, and an electronic unit associated with a computer.

The disadvantage of this device is the presence of mobile devices, the need for securing the tube to the reflector, a large measurement time and the inability to simultaneously control the length and curvature of the pipe.

The technical result of the invention is to simplify the design by eliminating the device moving parts, improving the speed and accuracy of measurements and the extension of functionality by providing the possibility of simultaneous measurement of the length and curvature of the controlled object.

This technical result is achieved by the fact that optic and optical measuring head (JIU), including a projection lens with a linear increase of the Bet, the focal length f, the relative distortionTheaboutand the angle of view tgW and connected with the electronic unit of the CCD-line with rectangular sensitive sites in size And In, and the measured pipe length LTrand the average curvature DAC pipes are calculated respectively by the formulas DTr=And(N2-N1)/Bet,cf=2 Bet (Ucf-Uo)/(A2(Ncf-NR2), where N1, N2 are the numbers of sites CCD line corresponding to the ends of the pipe, UcpNcpthe relative magnitude of the signal and the number of sites CCD line corresponding to maximum displacement of the image tube in its middle part, Uo, No - relative signal value and the number of sites CCD line corresponding to the displacement of the pipe at its end, while conditions are Bet=B/d (1)Theabout<DTr/DTr.max(2) A=BetDTr(3) tg W=DTr.max/L, (4)
AN2f tg W, (5) where
d - outside diameter of pipe,
L is the distance from the lens of the JIU to the pipe,
where N is the number of elements of the CCD line,

The invention is illustrated in Fig.1 and Fig.2, which respectively shows a diagram of the device and the pipe image on the CCD line.

Opto-electronic device for automated measurement of the length and curvature of the pipe contains an electronic unit (not shown) and an optical measuring head 1, including a projection lens 2 and the CCD line 3 (see Fig.1).

JIU 1 is placed over the pipe 4 so that the maximum pipe length to fit entirely within the field of view of the lens 2, the pipe 4 is installed at some distance from the light to the substrate 6. The electronic unit can be installed anywhere. The sensitive element of the JIU is a CCD line 3 with a rectangular photosensitive sites 5 size And to the East On the line 3 through the projection lens 2 with a variable focal distance image is projected 7 pipe 4 of diameter d. The magnification of the projection lens due to a change in focal length is set such that the width In the sensitive cells was equal to the width of the image tube.

When ISM is Naki has 3 distinct areas with different light levels (see Fig.2). To measure the length of a tube in the signal received from all elements of line 3 defines the number of points with a maximum gradient of illumination. These points correspond to the ends of the pipe 4. Knowing the distance between these points along the line 3 and the increase in Bet lens 2, determine the desired length of the pipe by the formulaTr=A(N2-N1)/Bet, where N1, N2 are the numbers of sites CCD line corresponding to the ends of the pipe.

When measuring the curvature of the pipe, its image is formed on the CCD line, the pipe should be rotated along its longitudinal axis. The amount of displacement of the images of individual sections of the pipe 4 in the horizontal plane is changed from zero to a maximum in the middle part of the pipe (see Fig.2). Defining the differential signal changes along the edge and in the middle of the tube, while its rotation it is possible to judge the presence and magnitude of curvature. The curvature is calculated by the formula Kcf= 2Bet(Ucp-Uo)B/(A2(Ncp-No)2), where UcpNcpthe relative magnitude of the signal and the number of sites CCD line corresponding to maximum displacement of the image tube in its middle part, Uo, No - relative signal value and the number of sites CCD line corresponding to the displacement of the pipe at its end.

DL serves to control the operation of the CCD peredachi in computer lengths and curvature.

The conditions (1) to (5), describing the requirements to the parameters of the lens, allows to increase the accuracy of the measurement., and the use of the CCD line provides improved performance measurement.


Claims

Opto-electronic device for measuring the length and curvature of the pipe containing the electronic unit and the optical measuring head (JIU), which includes a projection lens with a linear increase of the Bet, the focal length f, the relative distortionUOB and angle tg W and connected with the electronic unit of the CCD-line with rectangular chuvstvitelnye sites size And In, and measured the length of the pipe TDR and mean curvature DAC pipes are calculated respectively by formulas

TDR=A(N2-N1)/Bet

DAC=2 Bet(Ucp-Uo)B/(A2(Ncp-No)2),

where N1, N2 are the numbers of sites CCD line corresponding to the ends of the tubes;

Ucp, Ncp is the relative magnitude of the signal and the number of sites CCD line corresponding to maximum displacement of the image tube in its middle part;

Uo, No - relative signal value and the number of sites CCD line corresponding to the mixing pipe at its end, with conditions

Bet=Bimg.russianpatents.com/chr/948.gif">TDR,

tg W=TDR.max/L,

AN2f tg W,

where d is the external diameter of the pipe;

L is the distance from the JIU to the pipe,

N is the number of elements of the CCD line,

TDR - the maximum permissible absolute error of measurement of the pipe length;

TDR. max - maximum measured length of the pipe.

 

Same patents:

The invention relates to measuring equipment

The invention relates to the topography, profilometry

The invention relates to measuring technique and can be used to visualize the profiles of three-dimensional objects

The invention relates to the field of measurement technology and can be used to visualize the profiles of three-dimensional objects

The invention relates to measurement devices, and specifically to the field of contactless optical measurement of the surface shape of optical products, for example, spherical and aspherical mirrors or lenses in terms of optical engineering and laboratory research

The invention relates to measuring technique and can be used to visualize the profiles of three-dimensional objects

The invention relates to the field of measurement technology and can be used to visualize the profiles of three-dimensional objects

The invention relates to the field of measurement technology and can be used to visualize the profiles of three-dimensional objects

The invention relates to measuring and fiber-optic technology and can be used in instrument, machine tools and machinery for high-precision non-contact measurement of linear (position l, offsetl) and angular (tiltoffsetparameters of the spatial position and surface roughness of the object (of elements)

The invention relates to a measurement technique, namely the incremental measurement of linear displacement

The invention relates to the field of measurement technology and can be used to determine the size of the object and plots

The invention relates to devices for measuring the length of the plane-parallel end measures of length (CMD) and can be used in mechanical engineering, instrumentation and other industries with the implementation of the specified destination

The invention relates to measuring equipment

The invention relates to a measurement technique, namely the dimension of the linear characteristics of the flexible sheet items, such as materials used in light industry

The invention relates to measuring technique and is intended for measuring geometrical parameters of nuclear reactors

The invention relates to the field of measurement technology and can be used for measuring linear dimensions

The invention relates to measurement devices, and in particular to methods of measuring the geometrical parameters of extended objects

FIELD: optics.

SUBSTANCE: device has radiation source in form of light diode, mounted on one of objects, and multi-element linear photo detector, mounted on another object. Photo detector is made in form of two pairs of multi-element linear photo detectors distanced from each other, light-sensitive lines of which in each pair are mounted at angle α1, relatively to other pair, and between light diode and each pair of linear photo detectors objective and device are mounted, the latter being used for forming light mark image from light diode in form of cross in plane of each pair of linear photo-detectors, made in form of no less than two cylindrical lens bitmaps, not screening each other, angle between symmetry planes of which is α2.

EFFECT: higher precision.

4 cl, 8 dwg

Up!