Optical component and infrared spectrum analysis system

Abstract

The present invention provides an optical component and an infrared spectrum analysis system. The optical component includes: a prism, the prism includes a first bottom surface, a second bottom surface, a first waist surface and a second waist surface, the first bottom surface and the second bottom surface are parallel to each other, the first waist surface and the second waist surface both extend between the first bottom surface and the second bottom surface and both are inclined toward the first bottom surface, there is a first intersection line between the first waist surface and the first bottom surface, there is a second intersection line between the second waist surface and the first bottom surface, and the first intersection line and the second intersection line form a first predetermined angle; and a reflective unit, the reflective unit can prevent light from emitting from the first waist surface or the second waist surface to the prism, or can reflect the light reflected from the first waist surface or the second waist surface to the prism back to the prism, so that the light incident on the first waist surface or the second waist surface perpendicular to the first bottom surface can form a serpentine light path in the prism. The above technical solution is intended to solve the problem of short equivalent optical path of ATR prism in the prior art.

Description

Technical Field

[0001] The invention relates to the field of optical instruments, and in particular provides an optical component and an infrared spectrum analysis system. Background Art

[0002] Infrared attenuated total reflection (ATR) absorption spectroscopy is an infrared spectroscopy technique commonly used to detect the composition of solid, liquid and compressed gas substances. The infrared light emitted from the light source passes through a crystal with a large refractive index and is projected onto the surface of the sample with a small refractive index. When the incident angle is greater than the critical angle, the incident light will produce total reflection. In fact, not all infrared light is reflected back, but it penetrates to a certain depth inside the surface of the sample and then returns to the surface. In this process, the sample selectively absorbs in the frequency region of the incident light, and the intensity of the reflected light is weakened, producing a spectrum similar to the transmission absorption, thereby obtaining the structural information of the chemical composition of the surface layer of the sample. It is worth mentioning that since this method does not require any treatment of the sample, it greatly simplifies the experimental process and can accurately detect the composition of the sample, and is widely used.

[0003] According to the ATR principle, each reflected evanescent light can only penetrate about 1um of the sample depth. For near-infrared samples with an optical path of more than 0.5mm, it needs to be reflected at least 50 times, and the corresponding prism length will reach the point where it is difficult to process. Moreover, if the size is too long and too large, it will not only be bloated in structure, but also difficult to ensure mechanical strength. The ATR prism in the prior art has insufficient equivalent optical path due to its small number of reflections, which often leads to problems such as insufficient peak intensity and easy buried peaks that affect measurement accuracy when measuring low-absorption materials, greatly limiting its application.

[0004] Therefore, this field needs a new technical solution to solve the above problems. Summary of the invention

[0005] In order to solve the problem of short equivalent optical path of ATR prism in the prior art, the present invention provides an optical component. The optical component of the present invention comprises: a prism, wherein the prism comprises a first bottom surface, a second bottom surface, a first waist surface and a second waist surface, wherein the first bottom surface and the second bottom surface are parallel to each other, wherein the first waist surface and the second waist surface both extend between the first bottom surface and the second bottom surface and both are inclined toward the first bottom surface, wherein a first intersection line exists between the first waist surface and the first bottom surface, wherein a second intersection line exists between the second waist surface and the first bottom surface, wherein the first intersection line and the second intersection line form a first predetermined angle; and a reflecting unit, wherein the reflecting unit can prevent light from emitting from the first waist surface or the second waist surface out of the prism, or can reflect light reflected from the first waist surface or the second waist surface out of the prism back into the prism, so that light incident on the first waist surface or the second waist surface perpendicular to the first bottom surface can form a serpentine optical path in the prism; the serpentine optical path comprises a plurality of first optical paths connected end to end in sequence, wherein each of the first optical paths comprises a plurality of second optical paths connected end to end in sequence, wherein the first optical path is transmitted between the first waist surface and the second waist surface, and the second optical path is transmitted between the first bottom surface and the second bottom surface.

[0006] The optical component of the present invention includes a prism, which allows light to propagate inside and can be totally reflected inside. The prism includes a first bottom surface and a second bottom surface that are parallel to each other, so as to control the reflection angle of the light when it is reflected between the first bottom surface and the second bottom surface to be the same, so as to reduce the design difficulty. The first waist surface and the second waist surface are both extended obliquely between the first bottom surface and the second bottom surface, so that when the light is incident on the first waist surface or the second waist surface in a direction perpendicular to the first bottom surface, it can be reflected on the corresponding first waist surface or the second waist surface, and then be incident on the first bottom surface or the second bottom surface, avoiding the influence of the refraction on the light trajectory caused by the light directly incident obliquely from the outside when passing through the first bottom surface or the second bottom surface, so as to control the optical path of the light. There are a first intersection line and a second intersection line between the first waist surface and the second waist surface and the first bottom surface respectively. The first intersection line and the second intersection line can be a line where a specific edge on the prism is located, or can be an intersection line that exists in theory. In the prism in the prior art, the first intersection line and the second intersection line are arranged to be parallel to each other, and the light is emitted from the prism after completing one transmission from the first waist surface to the second waist surface. In the present invention, a first predetermined angle is formed between the first intersection line and the second intersection line, and through the arrangement of a reflective unit, the reflective unit can bend the light emitted from the prism back into the prism, so that the light continues to propagate between the first waist surface and the second waist surface, so that each time the light passes through the reflection effect of the reflective unit, the optical path can be extended by about one time, so that after the light is incident on the first waist surface or the second waist surface perpendicular to the first bottom surface, a serpentine optical path can be generated between the first waist surface and the second waist surface, that is, each time the light completes a propagation from the first waist surface to the second waist surface, it will turn around again and propagate once from the second waist surface to the first waist surface, thereby extending the optical path of the light exponentially and improving the accuracy of the measurement.

[0007] In the preferred technical solution of the above optical assembly, in each of the first light paths, the second light path located upstream transmits to the second light path located downstream adjacent thereto by total reflection. Through the above arrangement, the light can be totally reflected on the second bottom surface during transmission to facilitate ATR detection.

[0008] In the preferred technical solution of the above optical component, the serpentine light path is transmitted in the direction of the expansion of the opening of the first predetermined angle. Through the above arrangement, the light incident on the first waist surface or the second waist surface perpendicular to the first bottom surface can be orderly propagated along the direction of the expansion of the opening, so as to facilitate the design of the prism and the collection of light.

[0009] In the preferred technical solution of the above optical component, the reflective unit includes a first reflective surface and a second reflective surface opposite to the first bottom surface and spaced apart from each other, the first reflective surface is used to reflect the light emitted from the first waist surface of the prism back into the prism, and the second reflective surface is used to reflect the light emitted from the second waist surface of the prism back into the prism. Through the above arrangement, the first waist surface and the second waist surface form the same angle with the first bottom surface, so as to control the trajectory of the light. Since the propagation direction of the light when it is emitted from the prism through the reflection effect of the first waist surface may be different from the propagation direction when it is emitted from the prism through the reflection effect of the second waist surface, the arrangement of the first reflective surface and the second reflective surface ensures that each time the light is emitted from the prism, it can be reflected back into the prism again to continue to propagate, so as to extend the optical path.

[0010] In the preferred technical solution of the above optical component, the first waist surface and the second waist surface both form a second predetermined angle with the first bottom surface, and the first reflecting surface and the second reflecting surface both form a third predetermined angle with the first bottom surface. Through the above arrangement, the light emitted from the prism through the first waist surface and reflected back to the prism through the first reflecting surface is roughly symmetrical with the light emitted from the prism through the second waist surface and reflected back to the prism through the second reflecting surface, so that the optical path regularity is controllable, so as to facilitate the parameter design of the prism and the collection of light.

[0011] In the preferred technical solution of the above optical component, the first predetermined angle β, the second predetermined angle θ and the third predetermined angle γ satisfy: γ=arctan(sin2θ·tanβ), so that the light incident on the first waist surface perpendicular to the first bottom surface is reflected multiple times inside the prism and emitted from the second waist surface, and can be reflected back to the second waist surface perpendicular to the first bottom surface through the second reflecting surface; the light incident on the second waist surface perpendicular to the first bottom surface is reflected multiple times inside the prism and emitted from the first waist surface, and can be reflected back to the first waist surface perpendicular to the first bottom surface through the first reflecting surface. Through the above arrangement, when the light is incident on the first waist surface perpendicular to the first bottom surface, the light will be reflected multiple times between the first bottom surface and the second bottom surface, and will propagate toward the second waist surface. When the light hits the second waist surface, it will bend toward the first bottom surface and emit from the first bottom surface. The first reflective surface that meets the above conditions can reflect the light perpendicularly to the first bottom surface back to the second waist surface. Then the light will propagate toward the first waist surface and repeat a similar situation after reaching the first waist surface, thereby forming a serpentine light path through multiple reflections between the first waist surface and the second waist surface to extend the optical path.

[0012] In order to solve the problem of the shorter equivalent optical path of the ATR prism in the prior art, the present invention also provides an infrared spectrum analysis system. The infrared spectrum analysis system of the present invention comprises: an optical component according to any one of the above-mentioned preferred technical solutions; a light emitting component, which can emit light perpendicular to the first bottom surface onto the first waist surface or the second waist surface; and a light receiving component, which is used to receive the light emitted from the prism. Through the above-mentioned arrangement, the light emitted by the light emitting component can form a serpentine optical path in the prism, and the light emitted from the prism is received and analyzed by the light receiving component, so as to overcome the problem of the shorter equivalent optical path of the ATR prism in the prior art.

[0013] In the preferred technical solution of the above infrared spectrum analysis system, the first bottom surface faces the light emitting component and the light receiving component, the second bottom surface is suitable for contacting the material to be tested and the light is totally reflected on the second bottom surface. Through the above arrangement, the first bottom surface faces the light emitting component and the light receiving component, so that the light emitting component and the light receiving component can be arranged on the same side, thereby ensuring that there is enough space for the second bottom surface to contact the material to be tested, and the light is totally reflected on the second bottom surface, so that the material to be tested absorbs part of the energy of the light.

[0014] In the preferred technical solution of the infrared spectrum analysis system, the light emitting device includes a light source and a first optical fiber and a first collimator arranged in sequence along the propagation direction of the light emitted by the light source. Through the arrangement of the first optical fiber, the disordered light emitted from the light source can enter the light from one end of the first light, converge to the other end of the first optical fiber, and then switch to parallel light through the first collimator and enter the prism.

[0015] In the preferred technical solution of the infrared spectrum analysis system, the light receiving assembly includes a second collimator, a second optical fiber and a spectrometer which are sequentially arranged along the propagation direction of the light emitted from the prism. Through the arrangement of the second collimator, the parallel light emitted from the prism can be converged by the second collimator to one end of the second light, and transmitted from the other end of the second light to the spectrometer for processing and analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0017] Figure 1 It is a structural schematic diagram of an embodiment of an infrared spectrum analysis system of the present invention;

[0018] Figure 2 is a front view of an embodiment of a prism of an optical assembly of the present invention;

[0019] Figure 3 is a top view of an embodiment of a prism of an optical assembly of the present invention;

[0020] Figure 4 It is a partial side schematic diagram of an embodiment of an optical component of the present invention.

[0021] List of reference numerals:

[0022] 100, optical component; 10, prism; 11, first bottom surface; 12, second bottom surface; 13, first waist surface; 131, third intersection line; 132, incident point; 14, second waist surface; 141, fourth intersection line; 20, reflecting unit; 21, second reflecting surface; 22, first avoidance hole; 23, second avoidance hole; 300, infrared spectroscopy system; 40, light emitting component; 41, light source; 42, first optical fiber; 421, first end; 422, second end; 43, first collimator; 50, light receiving component; 51, filter; 52, second collimator; 53, second optical fiber; 54, spectrometer; 600, material to be tested; 700, serpentine optical path; 70, first optical path; 71, second optical path. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0024] It should be noted that, in the description of the present invention, the terms “first” and “second” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In order to solve the problem of short equivalent optical path of ATR prism in the prior art, the present invention provides an optical component 100. The optical component 100 of the present invention comprises: a prism 10, wherein the prism 10 comprises a first bottom surface 11, a second bottom surface 12, a first waist surface 13 and a second waist surface 14, wherein the first bottom surface 11 and the second bottom surface 12 are parallel to each other, the first waist surface 13 and the second waist surface 14 both extend between the first bottom surface 11 and the second bottom surface 12 and both are inclined toward the first bottom surface 11, there is a first intersection line between the first waist surface 13 and the first bottom surface 11, there is a second intersection line between the second waist surface 14 and the first bottom surface 11, and the first intersection line and the second intersection line form a first predetermined angle; and a reflective unit 20, wherein the reflective unit 20 can prevent the light from passing through the first waist surface 13 and the second waist surface 14. The prism 10 can be emitted from the first waist surface 13 or the second waist surface 14, or the light reflected from the prism 10 from the first waist surface 13 or the second waist surface 14 can be reflected back into the prism 10, so that the light perpendicular to the first bottom surface 11 incident on the first waist surface 13 or the second waist surface 14 can form a serpentine light path 700 in the prism 10; the serpentine light path 700 includes a plurality of first light paths 70 connected end to end in sequence, each of the first light paths 70 includes a plurality of second light paths 71 connected end to end in sequence, the first light paths 70 are transmitted between the first waist surface 13 and the second waist surface 14, and the second light paths 71 are transmitted between the first bottom surface 11 and the second bottom surface 12.

[0027] Figure 1 It is a structural schematic diagram of an embodiment of an infrared spectrum analysis system of the present invention; Figure 2 FIG. 1 is a top view of an embodiment of a prism of an optical component of the present invention. Figure 1 and Figure 2 As shown, the optical component 100 of the present invention includes a prism 10. The prism 10 is made of a transparent optical material, and the light can be reflected multiple times inside the prism 10. In particular, when the incident angle of the light meets certain conditions, the light can be totally reflected inside the prism 10 (total reflection means: when the light enters the medium with a higher refractive index from the medium with a lower refractive index, if the incident angle is greater than a certain critical angle, the refracted light will disappear, and all the incident light will be reflected without entering the medium with a low refractive index). The optical materials used to make the prism 10 include but are not limited to sapphire, fused quartz or diamond.

[0028] Continue reading Figure 2 The prism 10 includes a first bottom surface 11 and a second bottom surface 12 that are parallel to each other. In one or more embodiments, the width of the first bottom surface 11 (based on Figure 1 and Figure 2The second bottom surface 12 is configured to be wider than the first bottom surface 11, with the width direction being the Y-axis direction, so that the light is incident from the first bottom surface 11 into the prism 10, and the second bottom surface 12 is used to contact the material to be tested 600. Alternatively, the second bottom surface 12 may also be configured to be wider than the first bottom surface 11, so that the light is incident from the second bottom surface 12 into the prism 10, and the first bottom surface 11 is in contact with the material to be tested 600.

[0029] Continue reading Figure 2 The prism 10 further includes a first waist surface 13 and a second waist surface 14 extending obliquely between the first bottom surface 11 and the second bottom surface 12. In one or more embodiments, the first waist surface 13 and the second waist surface 14 are both inclined toward the first bottom surface 11, so that the light entering the prism 10 from the first bottom surface 11 can directly hit the first waist surface 13 or the second waist surface 14. Alternatively, when the light enters the prism 10 from the second bottom surface 12, that is, when the second bottom surface 12 is wider than the first bottom surface 11, the first waist surface 13 and the second waist surface 14 are configured to face the second bottom surface 12.

[0030] Figure 3 1 is a top view of an embodiment of a prism of an optical component of the present invention. Figure 2 In one or more embodiments, the prism 10 is configured to have a cross-section that is substantially an isosceles trapezoidal, and in the length direction of the prism 10 (based on Figure 3 In the direction shown, the length direction of the prism 10 is the X-axis direction. Specifically, the third intersection line of the first waist surface 13 and the second bottom surface 12 is parallel to the X-axis. The area of ​​the isosceles trapezoid gradually decreases. Figure 3As shown, along the negative direction of the X-axis, the area of ​​the isosceles trapezoid gradually decreases. In other words, there is a first intersection line between the first waist surface 13 and the first bottom surface 11, and there is a second intersection line between the second bottom surface 12 and the first bottom surface 11. A certain angle is formed between the first intersection line and the second intersection line, and the angle is a first predetermined angle. In one or more embodiments, in order to ensure the optical performance and yield rate of the prism 10, the material at the two acute angles formed by the first bottom surface 11 and the first waist surface 13 and the second waist surface 14 can be eliminated. Therefore, the aforementioned first intersection line and the second intersection line are theoretically existing lines, rather than two specific edges on the surface of the prism 10. An obtuse angle is formed between the second bottom surface 12 and the first waist surface 13 and the second waist surface 14. A third intersection line 131 exists between the second bottom surface 12 and the first waist surface 13. Without affecting the local optical performance and processing difficulty, the third intersection line 131 can be configured as a specific visible line; similarly, a fourth intersection line 141 exists between the second bottom surface 12 and the second waist surface 14, and the fourth intersection line 141 can also be configured as a specific visible line. Correspondingly, the angle between the third intersection line 131 and the fourth intersection line 141 is also the first predetermined angle. Alternatively, the acute angle position can also be processed so that the first intersection line and the second intersection line can become specific visible lines on the surface of the prism 10. Next, the role of the first predetermined angle is described in detail.

[0031] Continue reading Figure 3 In one or more embodiments, when the light is incident on the first waist surface 13 perpendicularly to the first bottom surface 11, the light is reflected at the incident point 132 on the first waist surface 13, and then propagates toward the second waist surface 14. In one or more embodiments, a metal reflective layer is provided on the first waist surface 13 and the second waist surface 14, so that when the light is incident on the first waist surface 13 or the second waist surface 14 but does not meet the total reflection condition, the light can still be completely retained in the prism 10 and propagate in a parallel light state through mirror reflection. In the process of light propagation from the first waist surface 13 to the second waist surface 14, the light is totally reflected multiple times on the first bottom surface 11 and the second bottom surface 12, respectively, to form a second light path 71 with multiple bends. The second light path 71 located upstream is transmitted to the adjacent second light path 71 located downstream through total reflection.

[0032] When the light reaches the second waist surface 14, the light will tend to exit the prism 10 from the first bottom surface 11 under the mirror reflection of the second waist surface 14. At this time, if a reflective unit 20 is provided at the corresponding position of the first bottom surface 11 (the reflective unit can be provided on the first bottom surface 11 or provided on the outside spaced from the first bottom surface 11), the light will be reflected to the second waist surface 14 again. Then the light propagates from the second waist surface 14 toward the first waist surface 13. Due to the existence of the first predetermined angle, the light will arrive at a position on the first waist surface 13 that is closer to the positive direction of the X axis than the incident point 132. Then, the light is reflected on the first waist surface 13 and tends to leave the prism 10 toward the first bottom surface 11. Under the action of the reflective unit, the light propagates to the second waist surface 14 again. It can be understood that due to the existence of the first predetermined angle, the position where the light reaches the second waist surface 14 for the second time is closer to the positive direction of the X axis than the position where the light reaches the second waist surface 14 for the first time. Therefore, in the top view direction perpendicular to the first bottom surface 11, it can also be observed that the light forms a plurality of first optical paths 70 between the first waist surface 13 and the second waist surface 14. Each first optical path 70 includes a plurality of second optical paths 71. The first optical path 70 constitutes a serpentine optical path 700 generated by the light in the prism, and the serpentine optical path 700 is transmitted in the direction of the expansion of the opening of the first predetermined angle, so that when the light is transmitted between the first waist surface 13 and the second waist surface 14, neither the optical path is repeated nor the optical path is crossed.

[0033] For a conventional prism 10 with a width comparable to that of the present invention, the prism 10 of the present invention can extend the equivalent optical path by multiples. By adjusting the position where the light exits the prism 10, the number of times the light propagates between the first waist face 13 and the second waist face 14 can be controlled. In one or more embodiments, as Figure 3 As shown, the light forms 9 first optical paths between the first waist face 13 and the second waist face 14, which is equivalent to about 9 times the equivalent optical path of the prism 10 in the prior art, so that the intensity of the light lost in the material to be tested 600 is considerable. Even when ATR detection is performed on low-absorption materials, obvious peaks can still be obtained, thereby ensuring the accuracy of the measurement results.

[0034] Continue reading Figure 2In one or more embodiments, the first girdle face 13 and the second girdle face 14 both form a second predetermined angle with the first bottom surface 11. The second predetermined angle θ satisfies: θ=α / 2. Wherein, α is the total reflection angle designed as needed, that is, the angle between the light and the normal of the second bottom surface 12 when the light is incident on the second bottom surface 12. α needs to be greater than the Brewster angle ω related to the material properties of the prism and the sample (sinω=n1 / n2, n1 and n2 are the refractive indices of the prism 10 and the sample to be measured, respectively). In one or more embodiments, the prism 10 is made of sapphire material, the refractive index of the sample is 1.33, the Brewster angle ω=58°, and the designed total reflection angle α=63°. Alternatively, the first girdle face 13 and the second girdle face 14 can also be set to form different angles with the first bottom surface 11, but it is necessary to ensure that the light can always be totally reflected on the second bottom surface 12 in the several sections of the optical path selected for measurement to ensure the continuous progress of ATR detection.

[0035] Continue reading Figure 1 In one or more embodiments, the optical assembly 100 further includes a reflective unit 20. As mentioned above, the reflective unit 20 can reflect the light emitted from the prism 10 back into the prism 10, so that the light continues to propagate in the prism 10 and continues to be totally reflected on the second bottom surface 12 to cause the light to lose intensity in the material to be measured 600, thereby improving the accuracy of the measurement result.

[0036] In one or more embodiments, the reflective unit 20 includes a first reflective surface (not shown in the figure) facing the first bottom surface 11 and a second reflective surface 21. The first reflective surface is arranged on a side of the first bottom surface 11 opposite to the first waist surface 13, and is used to reflect the light emitted from the prism 10 from the first waist surface 13 back into the prism 10. The second reflective surface 21 is arranged on a side of the first bottom surface 11 opposite to the second waist surface 14, and is used to reflect the light emitted from the prism 10 from the second waist surface 14 back into the prism 10. In the case where both the first waist surface 13 and the second waist surface 14 form the same second predetermined angle with the first bottom surface 11, the first reflective surface and the second reflective surface 21 are configured to form the same third predetermined angle with the first bottom surface 11. Alternatively, when the first waist surface 13 and the second waist surface 14 form different angles with the first bottom surface 11 respectively, the first reflecting surface and the second reflecting surface 21 are configured to form different angles with the first bottom surface 11 respectively, so as to achieve the effect of reflecting the light emitted from the first waist surface 13 and the second waist surface 14 out of the prism 10 back into the prism 10.

[0037] Figure 4 It is a partial side schematic diagram of an embodiment of an optical component of the present invention. Figure 4The viewing angle is to observe the optical component 100 from the outer side of the second waist surface 14 in a direction parallel to the first bottom surface 11 and perpendicular to the fourth intersection line 141. In one or more embodiments, the second reflective surface 21 also extends along the viewing direction. The first predetermined angle β, the second predetermined angle θ and the third predetermined angle γ satisfy: γ=arctan(sin2θ·tanβ). Figure 4 As shown, after the light incident on the first waist surface 13 perpendicular to the first bottom surface 11 is reflected multiple times inside the prism 10 and emitted from the second waist surface 14 (because the light reflected by the second waist surface 14 does not meet the total reflection condition when it is incident on the first bottom surface 11, it is emitted from the prism 10 from the first bottom surface 11), its trajectory is not perpendicular to the first bottom surface 11. When the third predetermined angle between the second reflecting surface 21 and the first bottom surface 11 meets the condition, the light emitted from the prism 10 can be reflected back to the second waist surface 14 perpendicular to the first bottom surface 11 under the action of the second reflecting surface 21. Similarly, after the light incident on the second waist surface 14 perpendicular to the first bottom surface 11 is reflected multiple times inside the prism 10 and emitted from the first waist surface 13 (because the light reflected by the first waist surface 13 does not meet the total reflection condition when it is incident on the first bottom surface 11, it is emitted from the prism 10 from the first bottom surface 11), its trajectory is also not perpendicular to the first bottom surface 11. When the angle between the first reflecting surface and the first bottom surface 11 satisfies the above conditions, the light emitted from the prism 10 can be reflected back to the first waist surface 13 perpendicularly to the first bottom surface 11 through the first reflecting surface.

[0038] Therefore, each time the light enters the prism 10, it is perpendicular to the first bottom surface 11, so that no matter the light propagates from the first waist surface 13 to the second waist surface 14 or from the second waist surface 14 to the first waist surface 13, its trajectory is located on a plane perpendicular to the first bottom surface 11, and the plane where the trajectory is located is also perpendicular to the plane where the light starts, that is, when the light propagates from the first waist surface 13 to the second waist surface 14, the plane where the trajectory is located is perpendicular to the first waist surface 13; when the light propagates from the second waist surface 14 to the first waist surface 13, the plane where the trajectory is located is perpendicular to the second waist surface 14. In other words, Figure 3 As shown, when viewed in a direction perpendicular to the first bottom surface 11, the angles between the planes where the adjacent light trajectories are located are the same (that is, the angles of the adjacent first light paths 70 are the same), and are all the first predetermined angle β. Through the above arrangement, the propagation trajectory of the light in the prism 10 can be controlled, so as to facilitate the parameter design of the prism 10 or the infrared spectrum analysis system.

[0039] For example, Figure 2As shown, in each first optical path, the number of times N that the light is totally reflected on the second bottom surface can be approximately derived by the formula: D = N * 2 * h * tan (α), where D is the projected length of the second optical paths 71 connected end to end on the second bottom surface 12, and h is the thickness of the prism (based on Figure 2 In the orientation shown, the thickness of the prism is the length of the prism along the Z axis), and α is the designed total reflection angle.

[0040] like Figure 3 As shown, the number M of the first optical paths can also be approximately derived by the formula: W=M*D*tan(β), wherein W is the projection length of the serpentine optical path 700 on the first waist surface 13 (in one or more embodiments, the projection length of the serpentine optical path 700 on the first waist surface 13 is equal to the projection length of the serpentine optical path 700 on the second waist surface 14), and β is the angle between adjacent first optical paths 70.

[0041] Furthermore, when the single penetration depth Dp of the light in each material to be tested is known, the total penetration depth of the optical component 100 of the present invention in the material to be tested in one ATR detection can be calculated as N*M*Dp.

[0042] In an alternative embodiment, the reflective unit 20 may also be configured in other suitable forms so that the light leaving the prism 10 re-enters the prism 10 and is totally reflected on the second bottom surface 12 during the propagation toward the opposite first waist surface 13 or second waist surface 14, or is configured to prevent the light from emitting out of the prism.

[0043] Continue reading Figure 1 The present invention also provides an infrared spectrum analysis system 300. The infrared spectrum analysis system 300 includes the optical component 100, the light emitting component 40 and the light receiving component 50 in the above-mentioned embodiment. In one or more embodiments, the first bottom surface 11 is wider than the second bottom surface 12, and the light can pass through the first bottom surface 11 in a direction perpendicular to the first bottom surface 11 (i.e., the Z-axis direction) and directly hit the first waist surface 13 or the second waist surface 14. The first bottom surface 11 faces the light emitting component 40 and the light receiving component 50. The second bottom surface 12 is suitable for contacting the material to be tested 600 and for the light to be totally reflected on the second bottom surface 12. In an alternative embodiment, the second bottom surface 12 is wider than the first bottom surface 11, and the light can pass through the second bottom surface 12 in a direction perpendicular to the first bottom surface 11 and directly hit the first waist surface 13 or the second waist surface 14. The light emitting component 40 and the light receiving component 50 are arranged on the outside of the second bottom surface 12 and contact the material to be tested 600 through the first bottom surface 11.

[0044] In one or more embodiments, light is incident on the prism 10 from the first bottom surface 11. The optical assembly 100 further includes a reflective unit 20, and the first bottom surface 11 faces the reflective unit 20. A first avoidance hole 22 and a second avoidance hole 23 are provided on the reflective unit 20. Parallel light emitted by the light emitting assembly 40 can be incident on the prism 10 through the first avoidance hole 22. Light can be received by the light receiving assembly 50 through the second avoidance hole 23. Part of the reflective unit 20 where no avoidance hole is provided can reflect the light emitted from the prism 10 back into the prism 10. In one or more embodiments, the first avoidance hole 22 is provided above the first waist surface 13, so that the light incident on the prism 10 is first incident on the first waist surface 13. The second avoidance hole 23 is provided above the second waist surface 14, so that the light reflected from the prism 10 from the second waist surface 14 is received by the light receiving assembly 50. Alternatively, the first avoidance hole 22 and the second avoidance hole 23 may also be arranged at other suitable positions, for example, both are arranged above the first waist surface 13 , and accordingly, the light is reflected from the first waist surface 13 out of the prism 10 .

[0045] In one or more embodiments, the light emitting assembly 40 is used to emit light perpendicular to the first bottom surface 11 into the prism 10 of the optical assembly 100, so that the light is irradiated onto the first waist surface 13 without refraction. Alternatively, the light emitted by the light emitting assembly 40 can also be irradiated onto the second waist surface 14. In one or more embodiments, the light emitting assembly 40 includes a light source 41, a first optical fiber 42, and a first collimator 43. The first optical fiber 42 includes a first end 421 and a second end 422 opposite to each other. The light emitted by the light source 41 first enters the first optical fiber 42 from the first end 421, so that the light converged by the first optical fiber 42 can be emitted from the first optical fiber 42 from the second end 422 located at the focus of the first collimator 43, so that the scattered light is converted into parallel light through the action of the first collimator 43 and emitted into the prism 10, thereby ensuring that the light that is totally reflected and specularly reflected in the prism 10 is still parallel light when it is emitted from the prism 10. Alternatively, the light emitting assembly 40 may also be configured into other suitable structures according to practical needs to emit parallel light perpendicular to the first bottom surface 11 toward the prism 10 .

[0046] The light receiving assembly 50 is used to receive the light emitted from the prism 10, and analyze the properties of the material to be tested 600 based on the light. In one or more embodiments, the light receiving assembly 50 includes a filter 51, a second collimator 52, a second optical fiber 53 and a spectrometer 54. The light that has a tendency to exit the prism 10 after being reflected by the first waist surface 13 or the second waist surface 14 is not perpendicular to the first bottom surface 11, and refraction occurs when passing through the first bottom surface 11, so the parallel light exiting the prism 10 is also not perpendicular to the first bottom surface 11, so the light exiting the prism 10 forms a certain angle with the Z axis. In one or more embodiments, the filter 51 is configured to be perpendicular to the parallel light exiting the prism 10. The wavelength of the light passing through the filter 51 is 1100-1800nm. Alternatively, according to actual needs, the filter 51 can also allow light less than 1100nm or greater than 1800nm ​​to pass. The parallel light passing through the filter 51 is converged to a point through the second collimator 52 and enters the second optical fiber 53, and the second optical fiber 53 transmits the light to the spectrometer 54 for analysis. Alternatively, the light receiving assembly 50 can also be configured as other suitable structures according to actual needs to receive the parallel light emitted from the prism 10, for example, the filter 51 is removed.

[0047] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An optical component, characterized in that: The optical assembly comprises: A prism, the prism comprising a first bottom surface, a second bottom surface, a first waist surface, and a second waist surface, the first bottom surface and the second bottom surface are parallel to each other, the first waist surface and the second waist surface both extend between the first bottom surface and the second bottom surface and both are inclined toward the first bottom surface, there is a first intersection line between the first waist surface and the first bottom surface, there is a second intersection line between the second waist surface and the first bottom surface, and the first intersection line and the second intersection line form a first predetermined angle; and A reflective unit, wherein the reflective unit can prevent light from emitting from the first waist surface or the second waist surface, or can reflect the light reflected from the first waist surface or the second waist surface back into the prism, so that the light incident on the first waist surface or the second waist surface perpendicular to the first bottom surface can form a serpentine light path in the prism; the serpentine light path includes a plurality of first light paths connected end to end in sequence, each of the first light paths includes a plurality of second light paths connected end to end in sequence, the first light paths are transmitted between the first waist surface and the second waist surface, and the second light paths are transmitted between the first bottom surface and the second bottom surface.

2. The optical component according to claim 1, characterized in that In each of the first light paths, the second light path located upstream is transmitted to the second light path located downstream adjacent thereto by total reflection.

3. The optical component according to claim 1, characterized in that The serpentine light path is transmitted in a direction in which the opening of the first predetermined angle is expanded.

4. The optical component according to claim 1, characterized in that The reflecting unit includes a first reflecting surface and a second reflecting surface which are opposite to the first bottom surface and spaced apart from each other, the first reflecting surface being used to reflect the light emitted from the prism from the first waist surface back into the prism, and the second reflecting surface being used to reflect the light emitted from the prism from the second waist surface back into the prism.

5. The optical component according to claim 4, characterized in that The first waist surface and the second waist surface both form a second predetermined angle with the first bottom surface, and the first reflecting surface and the second reflecting surface both form a third predetermined angle with the first bottom surface.

6. The optical component according to claim 5, characterized in that The first predetermined angle β, the second predetermined angle θ and the third predetermined angle γ satisfy: γ=arctan(sin2θ·tanβ), so that the light incident on the first waist surface perpendicular to the first bottom surface can be reflected multiple times inside the prism and emitted from the second waist surface, and then reflected back to the second waist surface perpendicular to the first bottom surface through the second reflecting surface; the light incident on the second waist surface perpendicular to the first bottom surface can be reflected multiple times inside the prism and emitted from the first waist surface, and then reflected back to the first waist surface perpendicular to the first bottom surface through the first reflecting surface.

7. An infrared spectrum analysis system, characterized in that: The infrared spectrum analysis system comprises: The optical component according to any one of claims 1 to 6; a light emitting component, which can emit light perpendicularly to the first bottom surface and into the first waist surface or the second waist surface; and A light receiving component is used to receive the light emitted from the prism.

8. The infrared spectrum analysis system according to claim 7, characterized in that: The first bottom surface faces the light emitting component and the light receiving component, and the second bottom surface is suitable for contacting a material to be tested and the light is totally reflected on the second bottom surface.

9. The infrared spectrum analysis system according to claim 7, characterized in that: The light emitting assembly comprises a light source, and a first optical fiber and a first collimator which are sequentially arranged along the propagation direction of the light emitted by the light source.

10. The infrared spectrum analysis system according to claim 7, characterized in that: The light receiving assembly comprises a second collimator, a second optical fiber and a spectrometer which are sequentially arranged along the propagation direction of the light emitted from the prism.

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