Refractometer

Abstract

The refractometer comprises a prism, a light source and a camera, the prism is provided with an incident plane, an emergent plane and a refracting plane positioned between the incident plane and the emergent plane, and the refractive index of the prism is less than 1.7; a liquid to be detected is placed above the refraction surface, the light source is arranged in the opposite direction of the incident surface, the camera is arranged in the opposite direction of the emergent surface, light emitted by the light source is incident from the incident surface and irradiates the refraction surface, the refraction surface refracts the light at a preset angle, and reflected light is emitted from the emergent surface and is received by the camera. The cost is effectively reduced by controlling the refractive index of the prism to be 1.7 or below, the detection accuracy can be effectively improved through the prism with the low refractive index, meanwhile, the light source is achieved through an LED, and the stable light source is provided.

Description

Technical Field

[0001] The utility model relates to the technical field of optical measurement, in particular to a refractometer. Background Art

[0002] A refractometer is a device that measures the refractive index of a liquid. When light passes from one medium into another, it refracts, and the ratio of the sines of the angles of incidence is constant. This ratio is called the refractive index. Because dissolved solids increase the refractive index of a liquid, refractive index measurements can be used to measure the content of soluble solids in liquids. Soluble solids in aqueous solutions are typically sugars, so this device is called a saccharimeter for beverages (juices, sugar waters, etc.). The unit of measurement for a saccharimeter is degrees Brix.

[0003] The detection accuracy of the refractometer is related to the refractive index of the prism. The refractive index of existing refractometer prisms is mostly greater than 1.7. The refractive index in this range can reduce the reflection range of the reflection angle, which is conducive to the reception of the photoelectric sensor. However, the refractive index in this range has a low control over the dispersion of light. In order to ensure the accuracy of detection, it is necessary to add elements to suppress dispersion, which leads to increased costs.

[0004] Therefore, there is an urgent need to design a refractometer to overcome one or more of the above-mentioned deficiencies of the prior art. Utility Model Content

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a refractometer, characterized in that it includes: a prism, a light source, and a camera; the prism has an incident surface, an exit surface, and a refractive surface located between the incident surface and the exit surface, and the refractive index of the prism is less than 1.7; the liquid to be detected is placed above the refractive surface, the light source is arranged in the opposite direction of the incident surface, and the camera is arranged in the opposite direction of the exit surface, the light source emits light from the incident surface to illuminate the refractive surface, the refractive surface refracts the light at a predetermined angle, and the reflected light is emitted from the exit surface and received by the camera.

[0006] In a preferred embodiment, the light source is realized by LED lighting.

[0007] In a preferred embodiment, the central wavelength of the light source is between 500-600 nm.

[0008] In a preferred embodiment, the prism is a trapezoidal prism or a triangular prism.

[0009] The beneficial effects of the present invention are as follows: the present application effectively reduces costs by controlling the refractive index of the prism to below 1.7, and can effectively improve detection accuracy through the low-refractive-index prism. At the same time, the light source is realized by LED to provide a stable light source. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the present utility model.

[0011] In the picture:

[0012] 10. Prism; 11. Incident surface; 12. Refractive surface; 13. Exit surface; 14. Light source; 15. Camera. DETAILED DESCRIPTION

[0013] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0014] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms, "connection", and "installation" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "communication" can be a direct connection or an indirect connection through an intermediate medium. Here, "fixed" means that the two are connected to each other and the relative position relationship after connection remains unchanged. The directional terms mentioned in the embodiments of the present invention, such as "inside", "outside", "top", "bottom", etc., are only reference to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0015] In the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0016] In the embodiments of the present invention, "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0017] References to "one embodiment" or "some embodiments" in this specification mean that one or more embodiments of the present invention include a particular feature, structure or characteristic described in conjunction with that embodiment. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" that appear in different places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "comprise," "include," "have," and their variations all mean "including but not limited to," unless otherwise specifically emphasized. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0018] like Figure 1 As shown, the present invention provides a refractometer, characterized in that it includes: a prism 10, a light source 14, and a camera 15; the prism 10 has an incident surface 11 and an exit surface 13 and a refractive surface 12 located between the incident surface 11 and the exit surface 13, and the refractive index of the prism 10 is less than 1.7; the liquid to be detected is placed above the refractive surface 12, the light source 14 is arranged in the opposite direction of the incident surface 11, and the camera 15 is arranged in the opposite direction of the exit surface 13, the light source 14 emits light from the incident surface 11 to illuminate the refractive surface 12, the refractive surface 12 refracts the light at a predetermined angle, and the reflected light is emitted from the exit surface 13 and received by the camera 15.

[0019] In a preferred embodiment, the light source 14 is implemented by LED lighting.

[0020] In a preferred embodiment, the central wavelength of the light source 14 is between 500-600 nm.

[0021] In a preferred embodiment, the prism 10 is a trapezoidal prism or a triangular prism.

[0022] Specifically, the refractive index of the prism 10 is less than 1.7, which reduces the dispersion effect of the prism 10 on light, eliminates the components that suppress the dispersion phenomenon, reduces costs, and has a higher light transmittance, which means that more light can pass through the prism 10, thereby improving the detection sensitivity; at the same time, the low refractive index of the prism 10 can increase the reflection range of the reflection angle, so that the camera lens can adopt a larger field of view angle when designing, reducing the difficulty of lens manufacturing. The liquid to be detected is placed on the refractive surface 12 of the prism 10, and the light emitted by the light source 14 enters the prism 10 from the incident surface 11 and illuminates the refractive surface 12. At this time, since the liquid to be detected contains solid soluble matter, the refractive index of the liquid will increase, thereby increasing the critical angle of total reflection. This change will be received by the camera 15, and the amount of solid soluble matter can be inferred based on the change in refractive index. In order to provide a stable light source 14, the light source 14 is realized by LED light, and the central wavelength of the light source 14 is between 500-600nm, which can provide good refractive index changes to improve the detection accuracy. To ensure the uniformity of light, the light source 14 can be optionally a multi-light source 14.

[0023] In summary, the present application effectively reduces costs by controlling the refractive index of the prism 10 to below 1.7, and the low refractive index prism 10 can effectively improve detection accuracy. At the same time, the light source is realized by LED to provide a stable light source.

[0024] The present invention is not limited to what is described in the specification and implementation modes, and therefore additional advantages and modifications can be easily realized by those skilled in the art. Therefore, without departing from the spirit and scope of the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details, representative devices, and illustrated examples shown and described herein.

Claims

1. A refractometer, characterized in that: include: A prism, a light source, and a camera; the prism has an incident surface, an exit surface, and a refractive surface located between the incident surface and the exit surface, and the refractive index of the prism is less than 1.7; the liquid to be detected is placed above the refractive surface, the light source is located in the opposite direction of the incident surface, and the camera is located in the opposite direction of the exit surface. The light source emits light from the incident surface to the refractive surface, and the refractive surface refracts the light at a predetermined angle. The reflected light is emitted from the exit surface and received by the camera.

2. The refractometer according to claim 1, wherein The light source is realized by LED lighting.

3. The refractometer according to claim 1, wherein The prism is a trapezoidal prism or a triangular prism.

4. The refractometer according to claim 1, wherein The central wavelength of the light source is between 500-600 nm.

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