Hyperspectral camera

Abstract

A hyperspectral camera is disclosed. The hyperspectral camera of the present invention comprises: a lens; a first dichroic prism configured to split light incident through the lens and causes the split light to exit through a first-a exit surface, a first-b exit surface, and a first-c exit surface; a second dichroic prism configured to split light having exited through the first-a exit surface and cause the split light to exit through a second-a exit surface, a second-b exit surface, and a second-c exit surface; a first image sensor configured to receive light having exited through the second-a exit surface; a second image sensor configured to receive light having exited through the second-b exit surface; and a third image sensor configured to receive light having exited through the second-c exit surface, wherein optical path distances from the lens to the first image sensor, the second image sensor, and the third image sensor are equal to each other.

Description

hyperspectral camera

[0001] The present invention relates to a hyperspectral camera, and more specifically, to a hyperspectral camera configured to spectrally separate an input light source into a plurality of fine wavelengths for imaging.

[0002]

[0003] A hyperspectral camera is an electro-optical sensor that provides images containing spectral information and is equipped with a spectroscopic element that spectrally separates an input light source. The spectroscopic element serves to split light collected from an object into multiple fine wavelengths. Spectroscopic elements are implemented using methods such as prisms, diffraction gratings, and interference filters.

[0004] In this regard, Japanese Patent Publication No. 2017-009396 (hereinafter referred to as the "prior art") discloses an imaging device.

[0005] The imaging device of the prior art comprises a prism that spectrally separates light incident from a plant through an incident surface and emits the spectrally separated light from a plurality of exit surfaces, an infrared cut filter positioned opposite to a first exit surface and used for capturing a visible light image of the plant, and an optical filter positioned opposite to a second exit surface and used for capturing an image used for calculating a growth indicator of the plant.

[0006] In addition, the imaging device of the prior art comprises a first image sensor that receives light emitted from a first emission surface through an infrared cut filter and captures a visible light image, a second image sensor that receives light emitted from a second emission surface through an optical filter and captures an image used for calculating a plant growth indicator, and an output unit that outputs an image showing a visible light image and a calculated plant growth indicator.

[0007] The imaging device of the prior art has the advantage of being able to simultaneously capture visible light images and images used for calculating plant growth indicators, and prevents the user from misidentifying the growth status of the plant being captured due to a malfunction of the device body.

[0008] However, the imaging device of the prior art has the disadvantage that it takes a long time to obtain high resolution, and conversely, the resolution must be lowered to reduce the time to take.

[0009] [Prior Art Literature]

[0010] (Patent Document) Japanese Published Patent Application No. 2017-009396 (Date of Publication: January 12, 2017)

[0011]

[0012] The objective of the present invention is to provide a hyperspectral camera capable of acquiring high-resolution wavelength-specific images in a short time without special sensors or optical elements, and acquiring images with different wavelength ranges from the same image in a single shot.

[0013]

[0014] The above objective is achieved by a hyperspectral camera according to the present invention, comprising: a lens; a first dichroic prism that spectrally separates light incident through the lens and emits it through a firsta exit surface, a firstb exit surface, and a firstc exit surface; a second dichroic prism that spectrally separates light emitted from the firsta exit surface and emits it through a seconda exit surface, a secondb exit surface, and a secondc exit surface; a first image sensor that receives light emitted from the seconda exit surface; a second image sensor that receives light emitted from the secondb exit surface; and a third image sensor that receives light emitted from the secondc exit surface, wherein the optical path distances from the lens to the first image sensor, the second image sensor, and the third image sensor are equal to each other.

[0015] It may comprise: a third dichloic prism that spectrally separates light emitted from the first emission surface (1b) and emits it through the third emission surface (3a), the third emission surface (3b), and the third emission surface (3c); a fourth image sensor that receives light emitted from the third emission surface (3a); a fifth image sensor that receives light emitted from the third emission surface (3b); and a sixth image sensor that receives light emitted from the third emission surface (3c).

[0016] The optical path distances from the lens to the first image sensor, the second image sensor, the third image sensor, the fourth image sensor, the fifth image sensor, and the sixth image sensor can be made equal to each other.

[0017] It may comprise: a fourth dichloic prism that spectrally separates light emitted from the first c emission surface and emits it through the fourth a emission surface, the fourth b emission surface, and the fourth c emission surface; a seventh image sensor that receives light emitted from the fourth a emission surface; an eighth image sensor that receives light emitted from the fourth b emission surface; and a ninth image sensor that receives light emitted from the fourth c emission surface.

[0018] The optical path distances from the lens to the first image sensor, the second image sensor, the third image sensor, the fourth image sensor, the fifth image sensor, the sixth image sensor, the seventh image sensor, the eighth image sensor, and the ninth image sensor can be made equal to each other.

[0019] The first dichloic prism may comprise: a first dichloic surface that forms an angle of 45 degrees with the first dichloic surface and reflects light to the first dichloic surface; and a first dichloic surface that is orthogonal to the first dichloic surface and reflects light to the first dichloic surface.

[0020] The above-mentioned first-a exit surface and the above-mentioned second-a exit surface can be formed to be parallel to each other.

[0021] The second dichloic prism may comprise: a second dichloic surface of which is parallel to the first dichloic surface of which a second

[0022] The range of wavelengths transmitted and reflected by the second dichroic prism can be made narrower than the range of wavelengths transmitted and reflected by the first dichroic prism.

[0023] It may be comprised of a control unit that controls the focus and exposure of the lens and receives signals from the first image sensor, the second image sensor, and the third image sensor and converts them into a composite video signal.

[0024]

[0025] According to the present invention, the optical path distances from the lens to the first image sensor, the second image sensor, the third image sensor, the fourth image sensor, the fifth image sensor, the sixth image sensor, the seventh image sensor, the eighth image sensor, and the ninth image sensor are equal to each other, thereby enabling the acquisition of high-resolution wavelength-specific images in a short time without special sensors or optical elements, and the acquisition of images with different wavelength ranges in the same image with a single shot, thereby providing a hyperspectral camera.

[0026]

[0027] FIG. 1 is a drawing showing a hyperspectral camera according to an embodiment of the present invention.

[0028] FIG. 2 is a diagram showing the optical path from the lens of a hyperspectral camera according to an embodiment of the present invention to the first image sensor, the second image sensor, the third image sensor, the fourth image sensor, the fifth image sensor, the sixth image sensor, the seventh image sensor, the eighth image sensor, and the ninth image sensor.

[0029] FIG. 3 is a diagram showing the first image sensor, second image sensor, third image sensor, fourth image sensor, fifth image sensor, sixth image sensor, seventh image sensor, eighth image sensor, and ninth image sensor of a hyperspectral camera according to an embodiment of the present invention arranged in a matrix form.

[0030]

[0031] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, in describing the present invention, descriptions of already known functions or configurations will be omitted in order to clarify the gist of the present invention.

[0032]

[0033] FIG. 1 is a drawing showing a hyperspectral camera according to an embodiment of the present invention.

[0034] FIG. 2 is a diagram showing the optical path from the lens of a hyperspectral camera according to an embodiment of the present invention to the first image sensor, the second image sensor, the third image sensor, the fourth image sensor, the fifth image sensor, the sixth image sensor, the seventh image sensor, the eighth image sensor, and the ninth image sensor.

[0035] FIG. 3 is a diagram showing the first image sensor, second image sensor, third image sensor, fourth image sensor, fifth image sensor, sixth image sensor, seventh image sensor, eighth image sensor, and ninth image sensor of a hyperspectral camera according to an embodiment of the present invention arranged in a matrix form.

[0036] The objective of the present invention is to provide a hyperspectral camera (10) that acquires high-resolution wavelength-specific images in a short time without special sensors or optical elements, and acquires images with different wavelength ranges in the same image with a single shot.

[0037] As illustrated in FIG. 1, a hyperspectral camera according to an embodiment of the present invention includes a lens (100), a spectroscopic unit (200), a sensor unit (300), and a control unit (400).

[0038] The lens (100) is equipped with an optical lens. The control unit (400) controls the movement (focus) and exposure of the optical lens.

[0039] The control unit (400) controls the aperture to adjust the amount of light passing through the lens (100). The aperture value represents the degree of opening of the lens (100). Lowering the aperture value means opening the aperture. Lowering the aperture value can increase the amount of light entering the image sensor.

[0040] As illustrated in FIGS. 1 and 2, the spectroscopic unit (200) is configured to spectroscopically analyze light incident through the lens (100). The spectroscopic unit (200) determines the wavelength resolution capability and sensitivity of the hyperspectral camera (10).

[0041] The spectroscopic unit (200) forms a plurality of prism structures capable of transmitting and reflecting by wavelength. The spectroscopic unit (200) spectrally separates a wide wavelength band image created by a front optics into fine wavelengths and projects the spectrally separated image for each wavelength onto the sensor unit (300).

[0042] The sensor unit (300) includes an image sensor. The image sensor is made of a semiconductor that converts light into an electrical signal. Depending on the manufacturing process and application method for generating an image into a digital signal, the image sensor may be a CCD (Charge Coupled Device), a CIS (CMOS Image Sensor), etc.

[0043] The spectroscopic unit (200) includes a first dicloic prism (210).

[0044] As shown in FIG. 2, the first dichloic prism (210) spectrally separates light incident through the lens (100) and emits it through the first a exit surface (211), the first b exit surface (212), and the first c exit surface (213).

[0045] Light passing through the lens (100) is incident on the first dichloic prism (210). The first dichloic prism (210) spectrally separates the light emitted from the lens (100) into three wavelength bands through two dichloic surfaces. The first dichloic prism (210) is formed as a rectangular body by combining four triangular prisms.

[0046] Dichroic surfaces are formed by a dichroic optical coating on a triangular prism. If the dichroic surfaces become discontinuous, they form dark lines or double images. Therefore, high processing precision and strong adhesion are required for the dichroic surfaces.

[0047] The first dichloic prism (210) includes a first incident surface, a firsta exit surface (211), a firstb exit surface (212), a firstc exit surface (213), a firsta dichloic surface (210a) and a firstb dichloic surface (210b).

[0048] Light passing through the lens (100) enters the first dichloic prism (210) through the first incident plane. The normal direction of the first incident plane is parallel to the axis of the lens (100).

[0049] Among the light incident on the first dichroic prism (210), light of wavelength band I passes through the first dichroic surface (210a) and the first dichroic surface (210b) and is emitted through the first exit surface (211). The normal direction of the first exit surface (211) is parallel to the axis of the lens (100). The first incident surface and the first exit surface (211) form opposite surfaces of the rectangular body. For example, wavelength band I may be 500 to 600 nm.

[0050] The first dichroic surface (210a) reflects light of wavelength band II among the light incident on the first dichroic prism (210) through the first incident surface. The first dichroic surface (210a) forms an angle of 45 degrees with the first incident surface. The light of wavelength band II reflected by the first dichroic surface (210a) is emitted through the first exit surface (212). The normal direction of the first exit surface (212) is perpendicular to the axis of the lens (100). For example, wavelength band II may be 600 to 700 nm.

[0051] The first dichroic surface (210b) reflects light of wavelength III among the light incident on the first dichroic prism (210) through the first incident surface. The first dichroic surface (210b) is orthogonal to the first dichroic surface (210a). The light of wavelength III reflected by the first dichroic surface (210b) is emitted through the first exit surface (213). The normal direction of the first exit surface (213) is orthogonal to the axis of the lens (100). The first exit surface (212) and the first exit surface (213) form opposite surfaces of the rectangular body. For example, wavelength III may be 400 to 500 nm.

[0052] Here, wavelength bands I, II, and III were given as examples of the visible light range, but it goes without saying that they can be extended to the ultraviolet and infrared ray ranges.

[0053] As illustrated in FIG. 2, the spectroscopic unit (200) includes a second dichroic prism (220). The second dichroic prism (220) spectrally separates light emitted from the first-a emission surface (211) and emits it through the second-a emission surface (221), the second-b emission surface (222), and the second-c emission surface (223).

[0054] Light emitted from the first-a emission surface (211) is incident on the second dichloic prism (220). The second dichloic prism (220) spectrally separates the light emitted from the first-a emission surface (211) into three wavelength bands through two dichloic surfaces. The second dichloic prism (220) is formed as a rectangular body by combining four triangular prisms.

[0055] Dichroic surfaces are formed by a dichroic optical coating on a triangular prism. If the dichroic surfaces become discontinuous, they form dark lines or double images. Therefore, high processing precision and strong adhesion are required for the dichroic surfaces.

[0056] The second dichloic prism (220) includes a second incident surface, a seconda exit surface (221), a secondb exit surface (222), a secondc exit surface (223), a seconda dichloic surface (220a) and a secondb dichloic surface (220b).

[0057] Light emitted from the first-a exit surface (211) enters the second dichloic prism (220) through the second incident surface. The normal direction of the second incident surface is parallel to the axis of the lens (100). The first incident surface and the second incident surface are parallel to each other.

[0058] Among the light incident on the second dichroic prism (220), light of the first wavelength range passes through the seconda dichroic surface (220a) and the secondb dichroic surface (220b) and is emitted through the seconda exit surface (221). The normal direction of the seconda exit surface (221) is parallel to the axis of the lens (100). The firsta exit surface (211) and the seconda exit surface (221) are parallel to each other. The second incident surface and the seconda exit surface (221) form opposite sides of the rectangular body. For example, the first wavelength range may be 540 to 560 nm.

[0059] The second dichroic surface (220a) reflects light of the second wavelength range among the light incident on the second dichroic prism (220) through the second incident surface. The second dichroic surface (220a) forms an angle of 45 degrees with the second incident surface. The first dichroic surface (210a) and the second dichroic surface (220a) are parallel to each other. The light of the second wavelength range reflected by the second dichroic surface (220a) is emitted through the second exit surface (222). The normal direction of the second exit surface (222) is orthogonal to the axis of the lens (100). For example, the second wavelength range may be 510 to 530 nm.

[0060] The second dichroic surface (220b) reflects light of the third wavelength range among the light incident on the second dichroic prism (220) through the second incident surface. The second dichroic surface (220b) is orthogonal to the second dichroic surface (220a). The first dichroic surface (210b) and the second dichroic surface (220b) are parallel to each other. The light of the third wavelength range reflected by the second dichroic surface (220b) is emitted through the second exit surface (223). The normal direction of the second exit surface (223) is orthogonal to the axis of the lens (100). The second exit surface (222) and the second exit surface (223) form opposite sides of the rectangular body. For example, the third wavelength range may be 570 to 590 nm.

[0061] The range of wavelengths transmitted and reflected by the second dichroic prism (220) is narrower than the range of wavelengths transmitted and reflected by the first dichroic prism (210).

[0062] As illustrated in FIGS. 1 and 2, the sensor unit (300) includes a first image sensor (310), a second image sensor (320), and a third image sensor (330).

[0063] The first image sensor (310) receives light emitted from the seconda emission surface (221). The second image sensor (320) receives light emitted from the secondb emission surface (222). The third image sensor (330) receives light emitted from the secondc emission surface (223).

[0064] The optical path distances from the lens (100) to the first image sensor (310), the second image sensor (320), and the third image sensor (330) are equal. Additionally, dichloic prisms with a smaller range of transmitted and reflected wavelengths are arranged closer to the image sensors. Therefore, increasing the number of dichloic prisms allows for obtaining more finely detailed wavelength-specific images.

[0065] As illustrated in FIG. 2, the spectroscopic unit (200) includes a third dichroic prism (230). The third dichroic prism (230) spectrally separates light emitted from the first b exit surface (212) and emits it through the third a exit surface (231), the third b exit surface (232), and the third c exit surface (233).

[0066] Light emitted from the first-b exit surface (212) is incident on the third dichloic prism (230). The third dichloic prism (230) spectrally separates the light emitted from the first-b exit surface (212) into three wavelength bands through two dichloic surfaces. The third dichloic prism (230) is formed as a rectangular body by combining four triangular prisms.

[0067] Dichroic surfaces are formed by a dichroic optical coating on a triangular prism. If the dichroic surfaces become discontinuous, they form dark lines or double images. Therefore, high processing precision and strong adhesion are required for the dichroic surfaces.

[0068] The third dichloic prism (230) includes a third incident surface, a thirda exit surface (231), a thirdb exit surface (232), a thirdc exit surface (233), a thirda dichloic surface (230a), and a thirdb dichloic surface (230b).

[0069] Light emitted from the first-b exit surface (212) enters the third dichloic prism (230) through the third incident surface. The normal direction of the third incident surface is perpendicular to the axis of the lens (100). The first-b exit surface (212) and the third incident surface are parallel to each other.

[0070] Among the light incident on the third dichroic prism (230), light of the fourth wavelength range passes through the thirda dichroic surface (230a) and the thirdb dichroic surface (230b) and is emitted through the thirda exit surface (231). The normal direction of the thirda exit surface (231) is perpendicular to the axis of the lens (100). The firstb exit surface (212) and the thirda exit surface (231) are parallel to each other. The third incident surface and the thirda exit surface (231) form opposite sides of the rectangular body. For example, the fourth wavelength range may be 640 to 660 nm.

[0071] The thirda dichroic surface (230a) reflects light of the fifth wavelength range among the light incident on the third dichroic prism (230) through the third incident surface. The thirda dichroic surface (230a) forms an angle of 45 degrees with the third incident surface. The light of the fifth wavelength range reflected by the thirda dichroic surface (230a) is emitted through the thirdb exit surface (232). The normal direction of the thirdb exit surface (232) is parallel to the axis of the lens (100). For example, the fifth wavelength range may be 610 to 630 nm.

[0072] The third-b diclonal surface (230b) reflects light of the sixth wavelength range among the light incident on the third diclonal prism (230) through the third incident surface. The third-b diclonal surface (230b) is orthogonal to the third-a diclonal surface (230a). The light of the sixth wavelength range reflected by the third-b diclonal surface (230b) is emitted through the third-c exit surface (233). The normal direction of the third-c exit surface (233) is parallel to the axis of the lens (100). The third-b exit surface (232) and the third-c exit surface (233) form opposite surfaces of the rectangular body. For example, the sixth wavelength range may be 670 to 690 nm.

[0073] The range of wavelengths transmitted and reflected by the third dichroic prism (230) is narrower than the range of wavelengths transmitted and reflected by the first dichroic prism (210).

[0074] As illustrated in FIGS. 1 and 2, the sensor unit (300) includes a fourth image sensor (340), a fifth image sensor (350), and a sixth image sensor (360).

[0075] The fourth image sensor (340) receives light emitted from the thirda emission surface (231). The fifth image sensor (350) receives light emitted from the thirdb emission surface (232). The sixth image sensor (360) receives light emitted from the thirdc emission surface (233).

[0076] The optical path distances from the lens (100) to the first image sensor (310), second image sensor (320), third image sensor (330), fourth image sensor (340), fifth image sensor (350), and sixth image sensor (360) are equal to each other. Additionally, dichloic prisms with a smaller range of transmitted and reflected wavelengths are arranged closer to the image sensors. Therefore, increasing the number of dichloic prisms allows for obtaining more finely detailed wavelength-specific images.

[0077] As illustrated in FIG. 2, the spectroscopic unit (200) includes a fourth dichroic prism (240). The fourth dichroic prism (240) spectrally separates light emitted from the first c emission surface (213) and emits it through the fourth a emission surface (241), the fourth b emission surface (242), and the fourth c emission surface (243).

[0078] The light emitted from the first emission surface (213) is incident on the fourth dichloic prism (240). The fourth dichloic prism (240) spectrally separates the light emitted from the first emission surface (213) into three wavelength bands through two dichloic surfaces. The fourth dichloic prism (240) is formed as a rectangular body by combining four triangular prisms.

[0079] Dichroic surfaces are formed by a dichroic optical coating on a triangular prism. If the dichroic surfaces become discontinuous, they form dark lines or double images. Therefore, high processing precision and strong adhesion are required for the dichroic surfaces.

[0080] The fourth dichloic prism (240) includes a fourth incident surface, a fourtha exit surface (241), a fourthb exit surface (242), a fourthc exit surface (243), a fourtha dichloic surface (240a) and a fourthb dichloic surface (240b).

[0081] Light emitted from the first exit surface (213) enters the fourth dichloic prism (240) through the fourth incident surface. The normal direction of the fourth incident surface is perpendicular to the axis of the lens (100). The first exit surface (213) and the fourth incident surface are parallel to each other.

[0082] Among the light incident on the fourth dichroic prism (240), light of the seventh wavelength range passes through the fourth dichroic surface (240a) and the fourth dichroic surface (240b) and is emitted through the fourth exit surface (241). The normal direction of the fourth exit surface (241) is perpendicular to the axis of the lens (100). The first exit surface (213) and the fourth exit surface (241) are parallel to each other. The fourth incident surface and the fourth exit surface (241) form opposite sides of the rectangular body. For example, the seventh wavelength range may be 440 to 460 nm.

[0083] The 4a dichroic surface (240a) reflects light of the 8th wavelength range among the light incident on the 4th dichroic prism (240) through the 4th incident surface. The 4a dichroic surface (240a) forms an angle of 45 degrees with the 4th incident surface. The light of the 8th wavelength range reflected by the 4a dichroic surface (240a) is emitted through the 4b exit surface (242). The normal direction of the 4b exit surface (242) is parallel to the axis of the lens (100). For example, the 8th wavelength range may be 410 to 430 nm.

[0084] The 4b diclonal surface (240b) reflects light of the 9th wavelength range among the light incident on the 4th diclonal prism (240) through the 4th incident surface. The 4b diclonal surface (240b) is orthogonal to the 4a diclonal surface (240a). The light of the 9th wavelength range reflected by the 4b diclonal surface (240b) is emitted through the 4c ​​exit surface (243). The normal direction of the 4c ​​exit surface (243) is parallel to the axis of the lens (100). The 4b exit surface (242) and the 4c ​​exit surface (243) form opposite surfaces of the rectangular body. For example, the 9th wavelength range may be 470 to 490 nm.

[0085] The range of wavelengths transmitted and reflected by the fourth dichroic prism (240) is narrower than the range of wavelengths transmitted and reflected by the first dichroic prism (210).

[0086] As illustrated in FIGS. 1 and 2, the sensor unit (300) includes a seventh image sensor (370), an eighth image sensor (380), and a ninth image sensor (390).

[0087] The 7th image sensor (370) receives light emitted from the 4a emission surface (241). The 8th image sensor (380) receives light emitted from the 4b emission surface (242). The 9th image sensor (390) receives light emitted from the 4c ​​emission surface (243).

[0088] The optical path distances from the lens (100) to the first image sensor (310), second image sensor (320), third image sensor (330), fourth image sensor (340), fifth image sensor (350), sixth image sensor (360), seventh image sensor (370), eighth image sensor (380), and ninth image sensor (390) are equal to each other. Additionally, dichloic prisms with a smaller range of transmitted and reflected wavelengths are arranged closer to the image sensors. Therefore, increasing the number of dichloic prisms allows for obtaining more finely detailed wavelength-specific images.

[0089] The first dichroic prism (210) spectrally separates incident light into three wavelength bands through three emission surfaces. The second dichroic prism (220), the third dichroic prism (230), and the fourth dichroic prism (240) are provided on the three emission surfaces of the first dichroic prism (210) to spectrally separate light into nine (3×3) wavelength bands through a total of nine emission surfaces.

[0090] That is, if three dichloic prisms are positioned on the three emission sides of the dichloic prism, the wavelengths can be further subdivided into 27 (3×3×3) wavelength bands, 81 (3×3×3×3) wavelength bands, ... based on each dichloic prism, because they can be separated into three wavelengths based on each dichloic prism.

[0091] As described above, the hyperspectral camera according to the embodiment of the present invention can acquire images with different wavelength ranges in the same image in a single shot by dividing the wavelengths in various ways through the spectroscopic unit (200).

[0092] In addition, high-resolution wavelength-specific images can be obtained in a short time without special sensors or optical elements, and since high-resolution wavelength-specific images are captured in a single step, issues such as image synthesis or drag do not occur.

[0093] The control unit (400) receives a signal from the sensor unit (300) and converts it into a composite video signal. The composite video signal can be output through the output unit.

[0094] The control unit (400) includes an ISP (Image Signal Processor). The ISP performs signal processing to process special functions of the hyperspectral camera (10). The ISP acquires images from an image sensor (CCD, CIS) and performs basic luminance and color processing. Additionally, it can support focus, inversion, mosaic, DIS, image format, etc.

[0095] According to the present invention, the optical path distances from the lens (100) to the first image sensor (310), the second image sensor (320), the third image sensor (330), the fourth image sensor (340), the fifth image sensor (350), the sixth image sensor (360), the seventh image sensor (370), the eighth image sensor (380), and the ninth image sensor (390) are equal to each other, thereby enabling the acquisition of high-resolution images of different wavelengths in a short time without special sensors or optical elements, and the acquisition of images with different wavelength ranges in the same image with a single shot, thereby providing a hyperspectral camera (10).

[0096]

[0097] Although specific embodiments of the present invention have been described and illustrated above, it is obvious to those skilled in the art that the present invention is not limited to the described embodiments and can be modified and varied in various ways without departing from the spirit and scope of the present invention. Accordingly, such modifications or variations should not be understood individually from the technical spirit or perspective of the present invention, and the modified embodiments should be considered to fall within the scope of the claims of the present invention.

[0098]

[0099] [Explanation of the symbol]

[0100] 10: Hyperspectral Camera

[0101] 100 : Lens

[0102] 200 : Spectroscopic section

[0103] 210: First dichroic prism 230: Third dichroic prism

[0104] 211 : 1a emanation surface 231 : 3a emanation surface

[0105] 212 : 1st b cascade 232 : 3rd b cascade

[0106] 213 : 1st-century extrusion 233 : 3rd-century extrusion

[0107] 210a: Ia diclonal surface 230a: IIIa diclonal surface

[0108] 210b : Ith-b diclonal surface 230b : Third-b diclonal surface

[0109] 220: Second dichroic prism 240: Fourth dichroic prism

[0110] 221 : 2a emanation surface 241 : 4a emanation surface

[0111] 222 : 2b emanation surface 242 : 4b emanation surface

[0112] 223 : 2nd c emanation surface 243 : 4th c emanation surface

[0113] 220a: 2a diclonal surface 240a: 4a diclonal surface

[0114] 220b : 2b diclonal surface 240b : 4b diclonal surface

[0115] 300 : Sensor section

[0116] 310: 1st image sensor 360: 6th image sensor

[0117] 320: 2nd image sensor 370: 7th image sensor

[0118] 330: 3rd image sensor 380: 8th image sensor

[0119] 340: 4th image sensor 390: 9th image sensor

[0120] 350: 5th image sensor

[0121] 400 : Control unit

Claims

1. Lens; A first dichloic prism that spectrally separates light incident through the lens and emits it through a first-a exit surface, a first-b exit surface, and a first-c exit surface; A second dichloic prism that spectrally separates light emitted from the first emission surface (1a) and emits it through the second emission surface (2a), second emission surface (2b), and second emission surface (2c); A first image sensor that receives light emitted from the above-mentioned seconda emission surface; A second image sensor that receives light emitted from the above-mentioned secondb emission surface; and It includes a third image sensor that receives light emitted from the above-mentioned secondc emission surface, and The optical path distances from the lens to the first image sensor, the second image sensor, and the third image sensor are identical to each other. Hyperspectral camera.

2. In Paragraph 1, A third dichloic prism that spectrally separates light emitted from the first emission surface (1b) and emits it through the third emission surface (3a), third emission surface (3b), and third emission surface (3c); A fourth image sensor that receives light emitted from the above-mentioned thirda emission surface; A fifth image sensor that receives light emitted from the above-mentioned thirdb emission surface; and It includes a sixth image sensor that receives light emitted from the above-mentioned thirdc emission surface, and The optical path distances from the lens to the first image sensor, the second image sensor, the third image sensor, the fourth image sensor, the fifth image sensor, and the sixth image sensor are equal to each other. Hyperspectral camera.

3. In Paragraph 2, A fourth dichloic prism that spectrally separates light emitted from the first emission surface (c) and emits it through the fourth emission surface (4a), fourth emission surface (4b), and fourth emission surface (4c); A seventh image sensor that receives light emitted from the above-mentioned fourth-a emission surface; An eighth image sensor that receives light emitted from the above-mentioned 4b emission surface; and It includes a ninth image sensor that receives light emitted from the above-mentioned fourth c emission surface, and The optical path distances from the lens to the first image sensor, the second image sensor, the third image sensor, the fourth image sensor, the fifth image sensor, the sixth image sensor, the seventh image sensor, the eighth image sensor, and the ninth image sensor are equal to each other. Hyperspectral camera.

4. In Paragraph 1, The above-mentioned first dichloic prism is, A 1a diclonal surface that forms an angle of 45 degrees with the 1a emission surface and reflects light to the 1b emission surface; and A first diclonal surface orthogonal to the first diclonal surface of the first a and including a first diclonal surface of the first b that reflects light to the first c exit surface, Hyperspectral camera.

5. In Paragraph 4, The above-mentioned firsta exit surface and the above-mentioned seconda exit surface are parallel to each other, and The above second dichloic prism is, A 2a diclonal surface parallel to the 1a diclonal surface and reflecting light to the 2b exit surface; and A 2b diclonal surface parallel to the 1b diclonal surface and reflecting light to the 2c exit surface, Hyperspectral camera.

6. In Paragraph 1, The range of wavelengths transmitted and reflected by the second dichroic prism is narrower than the range of wavelengths transmitted and reflected by the first dichroic prism. Hyperspectral camera.

7. In Paragraph 1, A control unit comprising a control unit that controls the focus and exposure of the lens and receives signals from the first image sensor, the second image sensor, and the third image sensor and converts them into a composite video signal. Hyperspectral camera.

Images