CN102589684A - Infrared laser measurement image surface alignment device - Google Patents

Abstract

The invention relates to an image plane alignment device for infrared laser measurement, which belongs to the technical field of photoelectric measurement. The device is composed of two parts, the indicating system and the alignment system. In the indicating system, the indicating laser emits the indicating laser, which is output after passing through the reflector and the splitter prism, giving the indicating laser of the optical axis and the center position of the image plane; the laser to be measured enters the measuring system along the direction indicated by the indicating laser, and is aligned with the alignment reticle of the system The board gives the position of the incident laser, provides instructions for the laser to be tested to aim at the center of the image plane, and can convert the invisible infrared laser into visible indicator light. The laser to be tested is aimed at the center of the reticle, that is, aimed face center. The invention realizes fast and accurate alignment of the laser to be measured with the optical axis of the system and the center of the image plane.

Description

An Infrared Laser Measurement Image Plane Alignment Device

technical field

The invention relates to an image plane alignment device for infrared laser measurement, which belongs to the technical field of photoelectric measurement.

Background technique

Since the appearance of laser, it has been widely concerned by researchers because of its high brightness, good monochromaticity, strong directionality and other related characteristics. With the continuous development of laser technology, laser has been more and more used in various fields of people's production and life and military warfare. In various applications, it is necessary to test the parameters of the laser beam, especially in the military field, the accurate measurement of the quality of the laser beam is very important for the evaluation of the performance of the laser. Among the currently used laser beam quality testing methods, many laser beam parameters (such as beam divergence) are measured using the photoelectric method, that is, after the laser is processed by one or several optical systems, the laser signal is received by the image plane receiving device, and then further Calculation analysis processing. In order to reduce the impact of the aberration of the laser on the test results through the optical system, the laser is usually required to be incident along the optical axis of the optical system, and in order to avoid problems such as incomplete reception of signals by the image plane receiving device, the laser spot received by the image plane is required to be located at The area of the center of the image plane. In order to meet the above requirements, each laser parameter test needs to adjust the optical path and image center alignment of the laser to be tested. Affect the performance of the camera or even cause damage to the camera.

Contents of the invention

In order to realize the precise image plane alignment operation of the invisible infrared laser, the present invention proposes an infrared laser measurement image plane alignment device.

An infrared laser measurement image plane alignment device, as shown in Figure 1, the device consists of a measured laser 10, an indicating laser 8, a first reflector 6, a second reflector 7, a first beam splitting prism 3, a second beam splitting Composed of prism 4 and alignment reticle 5; wherein, the measured laser 10 is placed on a four-dimensional optical adjustment frame, which can be adjusted in height, level, pitch and azimuth; the indicator laser 8 is a green laser with a wavelength of 532nm; the first Reflector 6 and second reflector 7 are plane reflectors with a diameter of 2.54 cm, which are placed on two-dimensional optical adjustment mounts respectively, and can be adjusted in pitch and azimuth; the first beam splitting prism 3 and the second beam splitting prism 4 are made of Two triangular prisms are glued into a right-angle beamsplitter prism. The first beamsplitter prism 3 is used to split the incident laser light from the laser under test 10. A part of it is incident on the CCD camera 9, and the other part is irradiated by the second beamsplitter prism 4 on the alignment splitter. On the reticle 5, the alignment reticle 5 is a crosshair reticle with an up-conversion material and a backlight with a diameter of 5 cm; the second dichroic prism 4 is used to sequentially pass through the first reflector 6 and the second The output laser light of the indicating laser 8 reflected by the mirror 7 is reflected on the first dichroic prism 3, and then reflected and output by the first dichroic prism 3 as an external indication.

The system works as follows:

The device of the present invention is located between the optical system 1 and the CCD camera 9, and ensures that the optical axis of the optical system 1 passes through the center of the CCD camera 9 and aligns with the center of the reticle 6 when the optical system is adjusted, and is connected with the indicating laser 8 The output beam positions coincide.

When the system is working, the laser beam emitted by the indicator laser 8 is output through the first reflector 6, the second reflector 7, the second dichroic prism 4 and the first dichroic prism 3 as the position indication of the exit port of the measured laser 10, and the four-dimensional Optically adjust the platform so that the beam exit port of the measured laser 10 coincides with the output beam position of the indicating laser 8; turn off the power supply of the indicating laser 8, turn on the power switch of the measured laser 10, and observe whether there is a light spot on the alignment reticle 6 and Whether the light spot is in the center of the reticle, by adjusting the pitch and azimuth adjustment of the four-dimensional optical adjustment frame, adjust the light spot to the center of the reticle 6, and finally realize the precise alignment of the infrared laser to the image plane of the CCD camera 9.

Beneficial effect

The invention proposes a wide-spectrum laser beam divergence angle measurement system. The laser spot image is obtained by the visible light CCD camera and the near-infrared CCD camera, and the measurement of the divergence angle of the laser beam with any wavelength in the wide spectrum range of 400nm-1700nm is realized. The focal length of the optical system in the system and the resolution of the selected camera ensure that the measurement accuracy of the laser beam divergence reaches 0.02mrad.

The invention provides an infrared laser measurement image plane alignment device. The laser to be tested can easily and quickly find the position of the optical axis of the system and the center of the image plane through the indicating laser of the internal pointer laser pointer, and then make the laser to be tested aim at the center of the cross reticle through fine-tuning to achieve accurate alignment In the center of the image plane, the invisible infrared laser can be converted into visible light through the up-conversion material. The invention eliminates the cumbersome optical path collimation adjustment and image plane adjustment steps before each use of the optical system, as well as possible damage to the camera, and realizes fast and accurate alignment between the laser to be measured and the image plane.

Description of drawings

Figure 1 is a schematic structural diagram of an infrared laser measurement item alignment device, which is also a summary of the specification, where 10 is the measured laser, 1 is the laser measurement optical system, 2 is the adjustment platform, and 3 is the first beam splitting prism , 4 is the second dichroic prism, 5 is the alignment reticle, 7 is the second mirror, 6 is the first mirror, 8 is the pointer laser, and 9 is the CCD camera.

Detailed ways

An infrared laser measurement image plane alignment device, as shown in Figure 1, the device consists of a measured laser 10, an indicating laser 8, a first reflector 6, a second reflector 7, a first beam splitting prism 3, a second beam splitting Composed of prism 4 and alignment reticle 5; wherein, the measured laser 10 is placed on a four-dimensional optical adjustment frame, which can be adjusted in height, level, pitch and azimuth; the indicator laser 8 is a green laser with a wavelength of 532nm; the first Reflector 6 and second reflector 7 are plane reflectors with a diameter of 2.54 cm, which are placed on two-dimensional optical adjustment mounts respectively, and can be adjusted in pitch and azimuth; the first beam splitting prism 3 and the second beam splitting prism 4 are made of Two triangular prisms are glued into a right-angle beamsplitter prism. The first beamsplitter prism 3 is used to split the incident laser light from the laser under test 10. A part of it is incident on the CCD camera 9, and the other part is irradiated by the second beamsplitter prism 4 on the alignment splitter. On the reticle 5, the alignment reticle 5 is a crosshair reticle with an up-conversion material and a backlight with a diameter of 5 cm; the second dichroic prism 4 is used to sequentially pass through the first reflector 6 and the second The output laser light of the indicating laser 8 reflected by the mirror 7 is reflected on the first dichroic prism 3, and then reflected and output by the first dichroic prism 3 as an external indication.

The system works as follows:

The device of the present invention is located between the optical system 1 and the CCD camera 9, and ensures that the optical axis of the optical system 1 passes through the center of the CCD camera 9 and aligns with the center of the reticle 6 when the optical system is adjusted, and is connected with the indicating laser 8 The output beam positions coincide.

When the system is working, the laser beam emitted by the indicator laser 8 is output through the first reflector 6, the second reflector 7, the second dichroic prism 4 and the first dichroic prism 3 as the position indication of the exit port of the measured laser 10, and the four-dimensional Optically adjust the platform so that the beam exit port of the measured laser 10 coincides with the output beam position of the indicating laser 8; turn off the power supply of the indicating laser 8, turn on the power switch of the measured laser 10, and observe whether there is a light spot on the alignment reticle 6 and Whether the light spot is in the center of the reticle, by adjusting the pitch and azimuth adjustment of the four-dimensional optical adjustment frame, adjust the light spot to the center of the reticle 6, and finally realize the precise alignment of the infrared laser to the image plane of the CCD camera 9.

Claims (1)

1. a kind of infrared laser measurement image plane aligning device, this device is made of measured laser (10), indicator laser (8), the first reflector (6), the second reflector (7), the first dichroic prism ( 3), the second beam splitting prism (4) and the alignment reticle (5); among them, the measured laser (10) is placed on the four-dimensional optical adjustment frame, which can be adjusted in height, level, pitch and azimuth; the indicator laser (8) is a green laser with a wavelength of 532nm; the first reflector (6) and the second reflector (7) are plane reflectors with a diameter of 2.54cm, which are respectively placed on a two-dimensional optical adjustment frame and can be pitched and azimuth adjustment; the first beamsplitter prism (3) and the second beamsplitter prism (4) are right-angled beamsplitters formed by two triangular prisms glued together respectively, and the first beamsplitter prism (3) is used for the laser from the measured laser (10 ) incident laser light splitting, a part is incident on the CCD camera (9), and the other part is irradiated on the alignment reticle (5) through the second beam splitting prism (4), and the alignment reticle (5) is a diameter of 5cm A crosshair reticle with an up-conversion material and a backlight source; the second dichroic prism (4) is used to reflect the indicator laser (8) sequentially through the first reflector (6) and the second reflector (7) The output laser light is reflected on the first beam splitting prism (3), and is reflected and output by the first beam splitting prism (3) as an external indicator; The system works as follows: The device of the present invention is located between the optical system (1) and the CCD camera (9), and ensures that the optical axis of the optical system (1) passes through the center of the CCD camera (9) and aligns with the reticle (6) when adjusting the optical system The center of the crosshair, and coincides with the output beam position of the indicator laser (8); When the system is working, the laser beam emitted by the indicator laser (8) is output through the first reflector (6), the second reflector (7), the second beam splitter (4) and the first beam splitter (3) as the measured Indicate the position of the exit of the laser (10), adjust the four-dimensional optical adjustment platform so that the beam exit of the measured laser (10) coincides with the position of the output beam of the indicating laser (8); turn off the power of the indicating laser (8), turn on the Measure the power switch of the laser (10), observe whether there is a light spot on the alignment reticle (6) and whether the light spot is in the center of the cross line, and adjust the light spot to align with the reticle by adjusting the pitch and azimuth adjustment of the four-dimensional optical adjustment frame The center of the crosshair in (6) finally realizes the precise alignment of the infrared laser to the image plane of the CCD camera (9).

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