CN2589934Y - High accuracy laser scanning and path detecting controller - Google Patents

Abstract

The utility model relates to a high accuracy laser scanning and path detecting controller, which is used for controlling and measuring an outer diameter of a measured workpiece. The utility model comprises a laser sensor part and a control circuit part, wherein, the laser sensor comprises a laser arranged in an adjusting seat, a synchronous scanning prism, a reflecting mirror, a lens and a light collecting mirror. The utility model is characterized in that the window position of a right box body of the laser sensor is provided with a normal window; the control circuit part comprises a single-chip microprocessor, a photoelectric converter, a counting gate logic circuit, a counting circuit, a keyboard connected with the counting circuit, a display circuit and a control circuit for an input and an output interfaces. In such a way, the outer diameter of the measured workpiece is irrelevant to the scanning linear speed of light spots, and thus, errors produced by unstable linear speed of the light spots are eliminated, and technical requirements to the manufacture of a scanning system are reduced; a scanning turning mirror is arranged into an eight-surface prism with a smaller circumscribed circle, making the scanning light spots on the reflecting mirror surface more close to an optical axis, and non-linear errors of an optical system are reduced; the sealing and heat radiation properties of a cast aluminum sensor are good; the control circuit is simple.

Description

Controller is calibrated in high-precision laser scanning

Technical field

The utility model relates to a kind of laser outer diameter online measuring technique, relates in particular to a kind of high-precision laser scanning and calibrates controller.

Background technology

See also shown in Figure 1ly, this is the principle schematic that analog quantity one digital quantity (ADC) sensing mode of often taking in the technology is calibrated in the prior art laser scanning.Among Fig. 1, the synchronous multiple surface rotating mirror 2 of the light beam directive of laser instrument 1, synchronous multiple surface rotating mirror 2 direct reflections of warp are after by diversing lens 3, receiver lens 4 enters photoelectric tube 5.The multiaspect specular reflection point is taken on the focus of lens 3, when synchronous tilting mirror at the uniform velocity rotates, will be by lens 3 emitted laser bundles abreast at the uniform velocity to workpiece 6 scannings, the workpiece shielding signals (time variation) that is obtained by photoelectric tube 5 passes out workpiece outside dimension variation (referring to light intensity curve among the figure).Because laser spots is a uniform speed scanning,, just can directly read the absolute dimension of workpiece external diameter so workpiece external diameter shading time width ratio in the external diameter of measured workpiece, is counted the signal pulsewidth with the filler pulse of proper proportion.Scanning shading method measuring accuracy key factor is an at the uniform velocity property of spot scan.Because what prior art was used is that synchronous motor drives multifaceted prism, therefore adopts high-frequency crystal oscillator working frequency source usually, makes the phase-splitting power circuit, drives synchronous motor, realizes uniform speed scanning.And, revised by suitable circuit or data processing technique to existing fixed error in the photo-translating system.

Though said method can draw the outside dimension of measured workpiece, the defective that exists in relating to use is:

(1) because the prior art synchronous motor can't guarantee instantaneous constant speed, and the driving circuit that constitutes synchronous tilting mirror is complicated, and components and parts are more, not only increase manufacturing cost and poor stability;

(2) since in the prior art photo-translating system error that occurs from light, mechanical, electrical each side, these errors are made difference with technology and are shown randomness, do not reach desirable measurement result with " fixed error " correction measure, therefore improve accuracy of instrument and be restricted.

Summary of the invention

The purpose of this utility model is to provide a kind of improved high-precision laser scanning to calibrate controller, and it can overcome the shortcoming that prior art exists, and makes it to eliminate error, improves stability.

The purpose of this utility model is achieved in that

Controller is calibrated in a kind of high-precision laser scanning, is used to control and measure the external diameter of measured workpiece, partly is made up of laser sensor and control circuit;

Described laser sensor comprises, be placed in the laser instrument of adjusting in the seat, synchronous scanning prism through the synchronous motor driven rotary, by catoptron with lens that catoptron is oppositely arranged the scanning prism laser beam is formed the constant scanning light beam, directive is positioned at the measured workpiece G on the support, is sent into the control circuit section processes by the light signal after the workpiece G shading after condenser focuses on; Be characterized in:

At described laser sensor one normal window is set, this normal window is arranged on right case the window's position place;

Described control circuit partly is arranged in the electric control operation case; Control circuit partly comprises, chip microprocessor, be arranged on be connected with condenser light and photoelectric commutator that light signal is converted to electric signal in the laser sensor, what be connected with the count pulse oscillation source with photoelectric commutator is counting gate logical circuit, what be connected with counting gate logical circuit is counting circuit, and counting circuit is connected with keyboard circuit, display circuit, IO interface control circuit by the chip microprocessor data bus.

Calibrate in the controller in above-mentioned high-precision laser scanning, wherein, described normal window is arranged on the outer window position of right case.

Calibrate in the controller in above-mentioned high-precision laser scanning, wherein, described normal window is arranged on the window's position place in the right case.

Calibrating in the controller in above-mentioned high-precision laser scanning, wherein, is that heat shield and heat shield frame thereof are set outside the normal window at described right case window.

Calibrate in the controller in above-mentioned high-precision laser scanning, wherein, before described heat shield frame and heat shield, a protective cover is set.

Calibrate in the controller in above-mentioned high-precision laser scanning, wherein, photoelectric commutator in the described control circuit part comprises photoelectric tube, and reception is focused into through condenser by the measured workpiece external diameter signal after the workpiece G shading and is mapped on the photoelectric tube, is converted to electric signal by photoelectric commutator (202).

Calibrate in the controller in above-mentioned high-precision laser scanning, wherein, the counting circuit in the described control circuit part comprises, preceding photic zone counting circuit, normal window size counting circuit, back photic zone counting circuit.

The scanning of the utility model high-precision laser is calibrated controller owing to adopted above-mentioned technical scheme, makes it compared with prior art, has following advantage and good effect:

1. the utility model is owing to be provided with a normal window as sampling relatively at laser sensor, thereby make measure measured workpiece external diameter only with workpiece shading time td and normal window size sweep time tw ratio relevant, and it is irrelevant with the spot scan linear speed, therefore the setting of normal window is the treatment technology of taking a sample relatively, can not only eliminate the unsettled error of luminous point linear speed, and can improve measuring accuracy and transponder repeatability is good, also reduced technical requirement thus to the scanning system processing and manufacturing;

2. the utility model is owing to be the less octahedral prism of circumcircle with the scanning mirror setting, make scanning spot on the mirror surface more near optical axis, thereby can reduce luminous point linear speed unevenness in the sweep interval that causes by multifaceted prism, reduce the optical system nonlinearity erron;

3. the utility model is owing to adopt the hermetically sealed shell mechanism of cast aluminium with sensor, optimize, improved sensor internal accessory size, version, sealing and radiating condition, not only improve processing technology, improved exterior quality, and, control circuit part simple and stable can guarantee the on-the-spot long-term stable operation of commercial production under relatively poor environment.

Description of drawings

Calibrate the description of an embodiment of controller by following the utility model high-precision laser is scanned, can further understand the purpose of this utility model, specific structural features and advantage in conjunction with its accompanying drawing.Wherein, accompanying drawing is:

Fig. 1 is the fundamental diagram of prior art caliper;

Fig. 2 is that working sensor schematic diagram in the controller is calibrated in the scanning of the utility model high-precision laser;

Fig. 3 is that Fig. 2 sensor receiving optical signals is after photoelectricity changes the photosignal oscillogram that records after changeing;

Fig. 4 is the structural representation that controller is calibrated in the scanning of the utility model high-precision laser;

Fig. 5 is the block scheme that control circuit part in the controller is calibrated in the scanning of the utility model high-precision laser.

Embodiment

See also Fig. 2 and shown in Figure 3, Fig. 2 and Fig. 3 are respectively that the utility model high-precision laser scanning is calibrated in the controller working sensor schematic diagram and light signal after photoelectricity changes the photosignal oscillogram that records after changeing.

Among Fig. 2, the synchronous multiple surface rotating mirror 118 of the light beam directive of laser instrument 116, through synchronous multiple surface rotating mirror 118 direct reflections after diversing lens 112, receiver lens 106, enter photoelectric tube and photoelectric commutator 202 thereof unlike the prior art be that a normal window 111 also is set behind lens 112; When multiple surface rotating mirror 118 rotations, laser beam through lens 112 will at the uniform velocity scan measured workpiece G abreast, and because the setting of normal window 111, standard measured workpiece G is carried out laser scanning, thereby can reduce the processing and manufacturing of scanning system and the technical requirement that existing fixed error in the photo-translating system is revised.

See also Fig. 2 and shown in Figure 3, the utility model sets up standard window 111 as the measuring technique of taking a sample relatively, can avoid the instantaneous inconstant error of prism rotating speed.The principle of work that normal window 111 is taken a sample relatively is as follows.

By the normal window 111 reference dimension window W (distance between Fig. 2 label 111) that sets up standard, in canonical reference size window W, be divided into: preceding photic zone W1, back photic zone W2, workpiece shading region D; Three counting circuits count window (W) tw sweep time, preceding photic zone (W1) t1 sweep time, back photic zone (W2) t2 sweep time respectively are set in the control circuit, because the pass of its numerical value and photoscanning linear speed V is: $\mathrm{tw}=\frac{W}{V}.........\left(1\right)$ $t1=\frac{W1}{V}.........\left(2\right)$ $t1=\frac{W2}{V}.........\left(3\right)$ Scanning workpiece shading time td as seen from the figure is: $\mathrm{td}=\frac{D}{V}=\mathrm{tw}-t1-\mathrm{<figure-callout\; id="2"\; label="t"\; filenames="Y0229199300111.png"\; state="\{\{state\}\}">t</figure-callout>}2.........\left(4\right)$

Or: $V=\frac{W}{\mathrm{tw}}=\frac{D}{\mathrm{td}}.........\left(5\right)$

Can draw the workpiece external diameter thus $D=W\&CenterDot;\frac{\mathrm{td}}{\mathrm{tw}}.........\left(6\right)$ W--normal window size in the formula (being 55mm in the present embodiment), fixed constant,

The td--workpiece shading time (sweep time of corresponding workpiece external diameter) can calculate according to tw, t1, the t2 value of actual measurement,

The sweep time of the corresponding normal window size of tw--.

By formula (6) as seen, external diameter only with ratio

Relevant, and irrelevant with the spot scan linear speed.

Provable thus, the setting of normal window 111 i.e. " sampling relatively " treatment technology can be eliminated the unsettled error of luminous point linear speed, and it is good not only to improve measuring accuracy and transponder repeatability, has also reduced the technical requirement to the scanning system processing and manufacturing thus.

Please in conjunction with Fig. 2 referring to shown in Figure 4, Fig. 4 is a structural representation of the present utility model.The utility model high-precision laser scanning is calibrated controller and is made up of laser sensor 100 and control circuit part 200, is used to control and measure the external diameter of measured workpiece.

Laser sensor 100 comprises, be placed in the laser instrument of adjusting in the seat 117 116, in the present embodiment, the light source of sensor adopts semiconductor laser 116, make the size of laser instrument 116 and power supply thereof reduced, thereby make the sensor construction size compacter and volume is littler; Receiving laser instrument 116 gives off laser beam to synchronous scanning prism 118, this scanning prism 118 is by synchronous motor 113 driven rotary, in the present embodiment, scanning prism 118 designs are the less octahedral prism of circumcircle as scanning mirror (circumcircle φ 13.5mm), make scanning spot on the mirror surface more near optical axis, luminous point linear speed unevenness in the sweep interval that minimizing is caused by multifaceted prism, thus the optical system nonlinearity erron reduced; Scanning prism 118 emitted laser bundles form the constant scanning light beam via catoptron 115 that is oppositely arranged and lens 112 with laser beam; And one normal window 111 is set in laser sensor 100 right cases 101 windows 102 positions, this normal window 111 can be arranged on window 102 positions in the right case 101, in the present embodiment, normal window 111 is arranged on window 102 positions outside the right case 101, it is canonical reference size window W (with Fig. 2) that normal window 111 will form the constant scanning beam limit by catoptron 115 and lens 112, the scanning light beam directive measured workpiece of canonical reference size window W is positioned at the measured workpiece G on the support 107, receive by the signal after the measured workpiece G shading by condenser 106, light signal after condenser 106 focuses on is sent into photoelectric commutator 202, does input and processing by control circuit part 200.And, be that heat shield 110 and heat shield frame 109 thereof are set outside the normal window 111 at right case 101 windows 102, before heat shield frame 109 and heat shield 110, a protective cover 108 is set, with the life-span and the precision of raising sensor,

Please in conjunction with Fig. 2 and Fig. 4 referring to shown in Figure 5, Fig. 5 is the block scheme that control circuit part in the controller is calibrated in the scanning of the utility model high-precision laser.Described control circuit part 200 is arranged in the electric control operation case; Control circuit part 200 comprises, one chip microprocessor, 201, one photoelectric commutators 202, it comprises photoelectric tube (not shown), photoelectric tube receive after condenser 106 focuses on by the light signal after the workpiece G shading about the measured workpiece external diameter, be converted to electric signal by photoelectric commutator 202; What be connected with photoelectric commutator 202 output signals is counting gate logical circuit 203, and this counting gate logical circuit 203 provides counting pulse signal by count pulse oscillation source 204; What be connected with counting gate logical circuit 203 is counting circuit 205, and counting circuit 205 is connected with keyboard circuit 207, display circuit 208, IO interface control circuit 209 by chip microprocessor 201 data buss 206; In the present embodiment, counting circuit 205 comprises, preceding photic zone counting circuit 2051, normal window size counting circuit 2052, back photic zone counting circuit 2053.

" keyboard circuit ", " display circuit ", " input/output interface control circuit " in the control circuit part are general common circuit, no longer describe in detail at this.

The utility model control circuit part 200 is work like this:

Convert photosignal S by what laser sensor 100 obtained to through photoelectric commutator 202, photic zone was counted gate t1, back photic zone counting gate t2 and normal window size counting gate tw before this photosignal S was separated, and the preceding photic zone counting circuit 2051 of control, normal window size counting circuit 2052,2,053 three counting circuit work of back photic zone counting circuit respectively; During each end of scan, the measurement data of these three counting circuits of computer acquisition obtains by aforementioned formula (6) processing and surveys workpiece external diameter value.In sum, the scanning of the utility model high-precision laser is calibrated controller owing to the window that sets up standard at laser sensor, make the external diameter and the spot scan linear speed of measured workpiece irrelevant, therefore can eliminate the unsettled error of luminous point linear speed, also reduced technical requirement the scanning system processing and manufacturing; Simultaneously, because the scanning mirror setting is the less octahedral prism of circumcircle, the scanning spot on the mirror surface reduces the optical system nonlinearity erron more near optical axis; In addition, sensor adopts the hermetically sealed shell mechanism of cast aluminium, optimizes, improved sensor internal accessory size, sealing and radiating condition, and, control circuit part simple and stable can guarantee the on-the-spot long-term stable operation of commercial production under relatively poor environment, and is therefore very practical.

Claims (7)

1. controller is calibrated in a high-precision laser scanning, is used to control and measure the external diameter of measured workpiece, is made up of laser sensor (100) and control circuit part (200);

Described laser sensor (100) comprises, be placed in the laser instrument of adjusting in the seat (117) (116), synchronous scanning prism (118) through synchronous motor (113) driven rotary, by catoptron (115) with lens (112) that catoptron (115) is oppositely arranged scanning prism (118) laser beam is formed the constant scanning light beam, directive is positioned at the measured workpiece G on the support (107), is sent into control circuit part (200) by the light signal after the workpiece G shading after condenser (106) focuses on and handles;

It is characterized in that:

At described laser sensor (100) normal window (111) is set, this normal window (111) is arranged on right case 101 windows 102 positions;

Described control circuit part (200) is arranged in the electric control operation case; Control circuit part (200) comprises, chip microprocessor (201), be arranged on be connected with condenser (106) light and photoelectric commutator (202) that light signal is converted to electric signal in the laser sensor (100), with photoelectric commutator (202) be connected with count pulse oscillation source (204) be the counting gate logical circuit (203), what be connected with counting gate logical circuit (203) is counting circuit (205), and counting circuit (205) is by chip microprocessor (201) data bus (206) and keyboard circuit (207), display circuit (208), IO interface control circuit (209) connects.

2. controller is calibrated in high-precision laser scanning as claimed in claim 1, and it is characterized in that: described normal window (111) is arranged on the outer window of right case (101) (102) position.

3. controller is calibrated in high-precision laser scanning as claimed in claim 1, and it is characterized in that: described normal window (111) is arranged on the interior window of right case (101) (102) position.

4. controller is calibrated in high-precision laser scanning as claimed in claim 1, it is characterized in that: heat shield (110) and heat shield frame (109) thereof are set outside described right case (101) window (102) is normal window (111).

5. controller is calibrated in high-precision laser scanning as claimed in claim 4, it is characterized in that: at described heat shield frame (109) and the preceding protective cover (108) that is provided with of heat shield (110).

6. controller is calibrated in high-precision laser scanning as claimed in claim 1, it is characterized in that: the photoelectric commutator (202) in the described control circuit part (200) comprises photoelectric tube, the measured workpiece external diameter signal of reception after by workpiece G shading is focused into through condenser (106) and is mapped on the photoelectric tube, is converted to electric signal by photoelectric commutator (202).

7. controller is calibrated in high-precision laser scanning as claimed in claim 1, it is characterized in that: the counting circuit (205) in the described control circuit part (200) comprises, preceding photic zone counting circuit (2051), normal window size counting circuit (2052), back photic zone counting circuit (2053).

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