Carbon dioxide laser heating and drying device

Abstract

The utility model discloses a carbon dioxide laser heating and drying device which comprises a carbon dioxide laser, a coupling lens, a transmission optical fiber, a collimating lens, a beam shaper and a Powell prism. According to the device, flexible transmission of carbon dioxide laser is achieved through halide optical fibers or metal hollow optical fibers, beam uniformizing treatment of the carbon dioxide laser is achieved through combination of an integral mirror or a diffraction beam uniformizing element and a focusing lens, and therefore the heating and drying temperature with the temperature field evenly distributed is obtained. And a Powell prism is adopted to carry out light spot area amplification on the uniformly distributed rectangular light spots to obtain the uniformly distributed rectangular light spots with larger area.

Description

Technical Field

[0001] The utility model relates to a carbon dioxide laser heating and drying device, belonging to the technical field of lasers. Background Art

[0002] Laser heating and drying has a series of advantages such as fast heating and drying speed, high heating and drying temperature, and precise control of heating and drying area. It has broad application prospects in pre-oxidation heating of polyacrylonitrile fibers and rapid drying of paints or adhesives. Existing laser heating and drying mainly use near-infrared laser beams to directly irradiate the object to be dried, so that the temperature of the object is raised to the required drying temperature. Near-infrared lasers can be transmitted by quartz optical fibers and can achieve flexible transmission. However, the wavelength of carbon dioxide lasers is around 10μm, and currently they are mainly transmitted by light guide arms or flying optical systems. The inability to perform flexible transmission is a bottleneck restricting its application. Summary of the invention

[0003] In order to solve the above problems, the utility model provides a carbon dioxide laser heating and drying device, which adopts halide optical fiber or metal hollow optical fiber to realize flexible transmission of carbon dioxide laser, and adopts a combination of a beam shaper and a Powell prism to realize beam homogenization of carbon dioxide laser.

[0004] As attached Figure 1 As shown, the utility model provides a carbon dioxide laser heating and drying device, which includes a carbon dioxide laser, a coupling lens, a transmission optical fiber, a collimating lens, a beam shaper and a Powell prism; the light beam output by the carbon dioxide laser passes through the coupling lens and is coupled into the transmission optical fiber for transmission, the collimating lens collimates the light beam output by the transmission optical fiber, and after passing through the beam shaper, a rectangular light spot with uniform light field distribution is obtained on the top surface of the Powell prism, and the Powell prism further diverges and enlarges the rectangular light spot into a new rectangular light spot, and the new rectangular light spot is used to achieve uniform heating and drying of the surface of the object;

[0005] The carbon dioxide laser is a radio frequency carbon dioxide laser with an output wavelength of 10.6 μm;

[0006] The transmission optical fiber is preferably a silver bromide optical fiber or a metal hollow optical fiber, with a core diameter of no more than 800 μm and a numerical aperture of no more than 0.4, and is used to achieve flexible transmission of the output beam of the carbon dioxide laser;

[0007] The beam shaper is preferably a beam converter composed of an integrator or a diffraction beam homogenizing element and a focusing lens, the substrate is made of zinc selenide material, the energy utilization rate is not less than 80%, the uniformity of the light spot intensity distribution after the focusing lens is not less than 90%, and the size of the light spot incident on the top surface of the Powell prism is not larger than the size of the working area of ​​the Powell prism;

[0008] The coupling lens, collimating lens and focusing lens are plano-convex lenses made of zinc selenide, and the focal length is not more than 100 mm;

[0009] The Powell prism is a prism made of zinc selenide, with an outer diameter of no more than 20 mm, a working area of ​​no more than 2 mm×20 mm, and a full fan angle of no more than 120°.

[0010] Beneficial effects: The utility model provides a carbon dioxide laser heating and drying device, which adopts halide optical fiber or metal hollow optical fiber to realize flexible transmission of carbon dioxide laser, adopts an integrating mirror or a diffraction beam-uniform element in combination with a focusing lens to realize beam-uniform processing of carbon dioxide laser, thereby obtaining a heating and drying temperature with uniform temperature field distribution, and adopts a Powell prism to enlarge the spot area of ​​a uniformly distributed rectangular light spot to obtain a larger area of ​​uniformly distributed light spot. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the composition of a carbon dioxide laser heating and drying device. DETAILED DESCRIPTION

[0012] Embodiment 1: A carbon dioxide laser heating and drying device.

[0013] As attached Figure 1 As shown, the utility model provides a carbon dioxide laser heating and drying device, which includes a carbon dioxide laser, a coupling lens, a transmission optical fiber, a collimating lens, a beam shaper and a Powell prism; the light beam output by the carbon dioxide laser passes through the coupling lens and is coupled into the transmission optical fiber for transmission, the collimating lens collimates the light beam output by the transmission optical fiber, and after passing through the beam shaper, a rectangular light spot with uniform light field distribution is obtained on the top surface of the Powell prism, and the Powell prism further diverges and enlarges the rectangular light spot into a new rectangular light spot, and the new rectangular light spot is used to achieve uniform heating and drying of the surface of the object;

[0014] The carbon dioxide laser is a radio frequency carbon dioxide laser with an output wavelength of 10.6 μm;

[0015] The transmission optical fiber is a silver bromide optical fiber or a metal hollow optical fiber, with a core diameter of 400 μm and a numerical aperture of 0.2, and is used to realize flexible transmission of the output beam of the carbon dioxide laser;

[0016] The beam shaper is composed of an integrator mirror and a focusing lens, the substrate is made of zinc selenide material, the energy utilization rate is 95%, the uniformity of the light intensity distribution of the light spot after the focusing lens is 96%, and the light spot incident on the top surface of the Powell prism is a square spot of 1.5mm×10mm;

[0017] The coupling lens, collimating lens and focusing lens are plano-convex lenses made of zinc selenide, with focal lengths of 30 mm, 30 mm and 80 mm respectively;

[0018] The Powell prism is a prism made of zinc selenide, with an outer diameter of 12.7 mm, a working area of ​​2 mm×10 mm, and a full fan angle of 90°.

[0019] Embodiment 2: The beam shaper is composed of a diffraction beam homogenizing element and a focusing lens; the diffraction beam homogenizing element is a random phase Fresnel zone plate array, the substrate is a zinc selenide material, the energy utilization rate is 80%, the spot size incident on the top surface of the Powell prism after passing through the focusing lens is 1.2mm×10mm, and the uniformity of the spot light intensity distribution is 92%; the rest is the same as Embodiment 1.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A carbon dioxide laser heating and drying device, characterized in that The device comprises a carbon dioxide laser, a coupling lens, a transmission optical fiber, a collimating lens, a beam shaper and a Powell prism; the light beam output by the carbon dioxide laser is coupled into the transmission optical fiber for transmission after passing through the coupling lens, the collimating lens collimates the light beam output by the transmission optical fiber, and a rectangular light spot with uniform light field distribution is obtained on the top surface of the Powell prism after passing through the beam shaper, and the Powell prism further diverges and amplifies the rectangular light spot into a new rectangular light spot, and the new rectangular light spot is used to realize uniform heating and drying of the surface of the object; the carbon dioxide laser is a radio frequency carbon dioxide laser, and the output wavelength is 10.6 μm; The transmission optical fiber is a silver bromide optical fiber or a metal hollow optical fiber, the optical fiber core diameter is not greater than 800 μm, and the numerical aperture is not greater than 0.4; the beam shaper is a beam converter composed of an integrator or a diffraction beam-uniforming element and a focusing lens, the substrate is a zinc selenide material, the energy utilization rate is not less than 80%, the uniformity of the light spot intensity distribution after passing through the focusing lens is not less than 90%, and the size of the light spot incident on the top surface of the Powell prism is not greater than the size of the working area of ​​the Powell prism; The coupling lens, collimating lens and focusing lens are plano-convex lenses made of zinc selenide, and the focal length is not more than 100 mm; The Powell prism is a prism made of zinc selenide, with an outer diameter of no more than 20 mm, a working area of ​​no more than 2 mm×20 mm, and a full fan angle of no more than 120°.

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