CN2577239Y - Potable laser collimator - Google Patents

Abstract

A portable laser collimation measuring instrument is composed of three parts: a laser emitting and receiving head (1), a target mirror (2) and a signal processing unit (3). The laser transmitting and receiving head (1) is composed of an integrated semiconductor fiber laser (4), collimating lens (5), photoelectric receiver (6) and mechanical fine-tuning mechanism (7). The integrated semiconductor laser (4) and collimating lens (5), the photoelectric receiver (6) is respectively fixed on the mechanical fine-tuning mechanism (7) through the brackets (8, 9, 10, 11). The corner cube prism (13) in the target mirror (2) is fixed on the fine-tuning mechanism (15) by the prism seat (14). The signal processing unit completes the collection, processing and output of measurement signals. The measuring device has the advantages of small size, convenient measurement, high measurement stability and the like.

Description

A portable laser collimator

(1) Technical field

The utility model relates to a laser measuring instrument, which is particularly suitable for measuring the shape and position errors (such as straightness, coaxiality, etc.) of large workpieces.

(2) Background technology

At present, the methods of measuring the shape and position errors of large-scale workpieces such as straightness, coaxiality, and parallelism at home and abroad are still mainly used to draw steel wires and place fake shafts. These methods generally have the disadvantages of low measurement efficiency and poor measurement accuracy. In the late 1970s, various laser alignment methods and devices appeared at home and abroad. Due to the ubiquity of these laser alignment methods, the measurement target mirror has a cable following the photoelectric receiver, and the laser alignment head uses He- The Ne laser has a large volume and has not solved the problem of low alignment accuracy caused by the drift of the laser transmitter itself, and has not been widely used. A collimation device using a single-mode fiber and a He-Ne laser, because the single-mode fiber is used to reduce the drift of the laser itself, thereby improving the laser alignment accuracy, but the device uses separate components to couple the laser and the fiber, resulting in the output light intensity At the same time, the device still uses a target mirror with a cable, which brings certain difficulties to the rapid measurement on the spot [Feng Qibo et al., Automatic Readout Fiber Laser Alignment System, "Journal of Instrumentation", 1994, 15 (4) :363]. Patent 97250676.4 "Laser Alignment Measuring Instrument" proposes a laser alignment measurement device composed of a semiconductor laser and a position detector. Although this patent uses a semiconductor laser to reduce the volume of the collimation head, it does not take effective measures to reduce the size of the semiconductor laser. The drift of the laser makes the measurement accuracy not high. At the same time, because the detector is fixed on the measurement target mirror, the cable needs to move together when the target mirror is moved, which brings inconvenience to the measurement.

(3) Contents of the invention

The technical problem to be solved by the utility model is to provide a portable laser alignment measuring instrument. Since the photoelectric receiver is fixed on the laser emitting head, there is no photoelectric receiver and cable connection on the measuring target mirror; the laser collimation head uses an integrated semiconductor laser device, which makes the measuring device small in size, convenient in measurement, and high in measurement stability. advantage.

The technical scheme adopted by the utility model is: the laser collimator is composed of three parts: a laser emitting and receiving head, a target mirror and a signal processing unit. It is characterized in that: the laser emitting and receiving head is composed of a laser emitter, a collimating lens, a photoelectric receiver and a mechanical fine-tuning mechanism, and the laser emitter and the collimating lens are respectively fixed on the mechanical fine-tuning mechanism The light emitted by the device becomes parallel light with a suitable spot size after passing through the collimator lens. The photoelectric receiver is fixed on the mechanical fine-tuning mechanism through a bracket, and receives the light reflected from the target mirror. The mechanical fine-tuning mechanism mainly uses To adjust the laser light emitted by the outgoing laser emitting and receiving head, the laser emitter adopts an integrated semiconductor fiber laser, and this integrated semiconductor fiber laser mainly directly connects the semiconductor laser and the single-mode optical fiber through a hard connection (such as gluing or welding) ) are fixed together.

The target mirror includes a corner cube prism and a mechanical fine-tuning mechanism. The corner cube prism is fixed on the fine-tuning mechanism through a prism, receives the light emitted by the laser emitting and receiving head, and reflects the light to the photoelectric receiving device on the laser emitting and receiving head. On the device, the mechanical fine-tuning mechanism is mainly used to adjust the position of the reflected light and make the reflected light hit the photoelectric receiver; the signal processing unit completes the functions of collecting, processing and outputting the signal detected by the photoelectric receiver.

Described photoelectric receiver can adopt four-quadrant photoelectric receiver, PSD position-sensitive device and CCD photoelectric device; The mechanical fine-tuning mechanism on the described laser transmitting and receiving head can adopt two-dimensional direction adjustment mechanism or four-dimensional adjustment mechanism (two-dimensional direction and two-dimensional displacement), the fine-tuning mechanism on the target mirror needs to adopt a two-dimensional displacement adjustment mechanism.

Compared with the background technology, the utility model has the following advantages: firstly, a corner cone prism is used on the target mirror to reflect the incident light to the photoelectric receiver on the laser emitting and receiving head, realizing the target mirror without photoelectric receiver and without The cable connection brings great convenience to the measurement; secondly, the traditional He-Ne laser or semiconductor laser is replaced by an integrated semiconductor fiber laser, which greatly improves the space and time stability of the outgoing light and improves the accuracy of the laser. The straight precision also greatly reduces the volume of the laser transmitting and receiving head.

(4) Description of drawings

Figure 1 Front view of portable laser collimator

Figure 2 Top view of portable laser collimator

In the figure: 1 is the laser transmitting and receiving head, 2 is the target mirror, 3 is the signal processing unit, 4 is the integrated semiconductor fiber laser, 5 is the collimating lens, 6 is the photoelectric receiver, 7 is the mechanical fine-tuning mechanism, 8, 9 .

(5) Specific implementation methods

Referring to the accompanying drawings, the preferred way to realize the utility model is illustrated: the laser collimator (Fig. 1, Fig. 2) is composed of a laser emitting and receiving head 1, a target mirror 2 and a signal processing unit 3. It is characterized in that: the laser emitting and receiving head 1 is composed of an integrated semiconductor fiber laser 4 (laser transmitter), a collimating lens 5, a photoelectric receiver 6 and a mechanical fine-tuning mechanism 7, and the integrated semiconductor laser 4 and the collimator The straight lens 5 is respectively fixed on the mechanical fine-tuning mechanism 7 through brackets 8, 9 and 10. The light emitted by the integrated semiconductor laser 4 becomes parallel light with a suitable spot size after passing through the collimator lens 5. The photoelectric receiver 6 passes through the bracket 11 is fixed on the mechanical fine-tuning mechanism 7 to receive the light reflected from the target mirror 2. The mechanical fine-tuning mechanism 7 is mainly used to adjust the direction of the outgoing laser light from the laser emitting and receiving head 1. The entire laser emitting and receiving head uses a box 12 covers; Described target lens 2 is made up of a corner cube prism 13 and mechanical fine-tuning mechanism 15, and corner cube prism 13 is fixed on the fine-tuning mechanism 15 by prism seat 14, receives the light that laser emitting and receiving head 1 exits, and this The light is reflected on the photoelectric receiver 6 on the laser emitting and receiving head 1, and the mechanical fine-tuning mechanism 15 is mainly used to adjust the position of the reflected light, and makes the reflected light hit the photoelectric receiver 6; The signals detected by the photoelectric receiver 6 are collected, processed and output.

The photoelectric receiver 6 adopts a four-quadrant photoelectric receiver; the mechanical fine-tuning mechanism 7 on the laser transmitting and receiving head 1 can adopt a two-dimensional direction adjustment mechanism, and the fine-tuning mechanism 9 on the target mirror needs to adopt a two-dimensional displacement adjustment mechanism.

Using other types of lasers (such as He-Ne lasers, ordinary semiconductor lasers, etc.) CCD photoelectric device) instead of a four-quadrant photoelectric receiver can have the same effect.

The measurement principle of the utility model is briefly described as follows: the laser emitting and receiving head 1 and the target mirror 2 are fixed on the workpiece to be measured, the target mirror 2 is fixed on the movable platform (such as a slide block of the guide rail), and the laser emitting and receiving head 1 is adjusted. The direction fine-tuning mechanism and the displacement fine-tuning mechanism on the target mirror make the outgoing light basically parallel to the measured workpiece, and make the light reflected from the target mirror at the center of the photoelectric receiver 6 as much as possible. After the adjustment, move the movable table. If there is a straightness deviation in the workpiece, the target mirror must move in two directions perpendicular to the emitted light, thereby changing the position of the incident light on the corner cube. It can be known from the characteristics of the corner cube , the position of the light reflected by the corner-cube prism also changes. The deviation from the center of the light beam can be processed to obtain the straightness of the workpiece. Similar use of this device can also obtain other types of shape position errors of the workpiece.

The sensitivity of the device to measure the position change of the target mirror is 0.0005mm, the collimation distance is greater than 10m, and the measurement error is less than (0.002+2L)mm (L is the collimation distance, the unit is m), which is suitable for measuring the position errors of various shapes of large workpieces static and dynamic measurements.

Claims (2)

1. A portable laser alignment measuring instrument is made up of three parts of a laser emitting and receiving head (1), a target mirror (2) and a signal processing unit (3), and said laser emitting and receiving head (1) includes a laser emitter ( 4), collimating lens (5) and mechanical fine-tuning mechanism (7), described laser emitter (4) and collimating lens (5) are fixed on mechanical fine-tuning mechanism (7) by bracket (8), (9) On, it is characterized in that: the laser transmitter (4) in the laser transmitting and receiving head (1) is an integrated semiconductor fiber laser; the target mirror (2) includes a corner cube prism (13), the angle The axicon prism (13) is fixed on the mechanical fine-tuning mechanism (15) through a fixing seat (14). 2. A portable laser alignment measuring instrument according to claim 1, characterized in that: the laser emitting and receiving head (1) also includes a photoelectric receiver (6), and the photoelectric receiver (6) passes through the support ( 11) It is fixed on the mechanical fine-tuning mechanism (7).

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