TW202235827A - A handheld multispectral image apparatus with double-sleeve light guide and the measurement method thereof - Google Patents

Abstract

A handheld multispectral image apparatus with double-sleeve light guide and the measurement method thereof, including an outer sleeve, an illumination platform, an inner sleeve and a photosensitive element, wherein the top of the outer sleeve is provided with a measuring hole and a calibration plane. The illumination platform set in the outer sleeve has a through hole at the center. A plurality of light-emitting elements are arranged around the through hole to emit light. The inner sleeve is parallel to the outer sleeve, and one end of the inner sleeve is set at the illumination platform center and is connected to the through hole. The light emitted by the light-emitting elements is reflected upwards between the outer sleeve and the inner sleeve, and is emitted through the measuring hole to illuminate the object to be measured; after the light is reflected by the object and the calibration plane, the two reflected lights will be simultaneously reaches the photosensitive element through the inner sleeve and the through hole. Therefore, the present invention can make the light source reflect between the outer sleeve and the inner sleeve, and emitted evenly. Using the reflected light of the calibration plane to perform real-time white correction and reduce light source errors.

Description

Hand-held double-sleeve multispectral camera device and measurement method thereof

The invention relates to a spectrum analysis instrument, in particular to a hand-held double-sleeve spectrum camera device and a measurement method thereof.

Spectrometers are used to detect the components of analytes. The use of spectral analysis has the advantage of non-invasive detection. However, the hyperspectral equipment used in most research institutes is too large and expensive, so that the analysis results cannot be used commercially due to equipment limitations. Therefore, key wavelengths are selected from the hyperspectral data. , and then use multi-spectrum and design it as a hand-held instrument, which has the advantages of fast, portable, non-destructive and low cost, and is more suitable.

There are some problems in the current handheld spectrometers. For example, U.S. Patent US 9885655 B2 proposes to combine the light pipe with the structure of the spectrometer. A light guide directs light to the sample and also enables spectral measurements. The light pipe in this patent may comprise a flat sheet of homogeneous transparent material for unconstrained bi-directional propagation. In addition, the light guide can be solid, hollow or segmented to guide illuminating light and reflected light, respectively. However, this patent only guides the optical path without considering the error of the light source, which will make the analysis results inaccurate.

Another US patent US 10648861 B2 proposes a hand-held spectrometer protective case accessory, wherein the protective case can be used to calibrate the spectrometer and measure samples. The protective cover provides the function of shielding the external light source and correcting the light source, which solves the problem that the error of the light source is not considered in US Patent No. US 9885655 B2. However, generally speaking, when measuring the spectrum, it is necessary to measure the reflection intensity of the light source as a reference for the maximum energy value. The general measurement method is to measure and correct the reflective object and then measure the object to be measured; The error is caused by the light source. In the spectral scanning spectrum measurement, the light source is less stable due to the frequent switching of the light source, which makes the error larger. U.S. Patent No. US 10648861 B2 has this problem. The photosensitive element of this patent cannot receive the reflected light of the measurement sample and the calibration light source at the same time. Therefore, there is a time difference between the two light sources, and the error will be caused by the change of the light source at different times. , is still not precise enough.

Therefore, the present invention proposes a hand-held double-tube multi-spectral camera device and its measurement method in response to the lack of the above-mentioned conventional technology and future needs. The specific structure and implementation methods will be described in detail below:

The main purpose of the present invention is to provide a hand-held dual-sleeve multi-spectral camera device and its measurement method, which is provided with an inner sleeve and an outer sleeve, so that the light emitted by the light source is continuously reflected between the inner sleeve and the outer sleeve. Make the light irradiated to the object under test more uniform.

Another object of the present invention is to provide a hand-held double-tube multi-spectral camera device and its measurement method, which utilizes the design of the inner sleeve to shield stray light, so that the light reflected by the object to be measured directly passes through the inner sleeve Irradiating to the photosensitive element can prevent the light emitted by the light source from directly irradiating the photosensitive element during reflection and affecting the measurement result.

Another object of the present invention is to provide a hand-held double-sleeve multi-spectral camera device and its measurement method. The measuring hole on the top of the outer sleeve is designed as an annular plane, and diffuse reflection paint is applied as a correction plane. , so that when measuring the object to be measured, the correction plane will also reflect light at the same time, which can simultaneously measure the light source to correct the reflected energy intensity, and reduce the error caused by the light source.

In order to achieve the above object, the present invention provides a hand-held double-sleeve multi-spectral camera device, which is suitable for measuring an object to be measured. The hand-held double-sleeve multi-spectral camera device includes: an outer sleeve, a An illumination platform, an inner sleeve and a photosensitive element, wherein the top of the outer sleeve is provided with a measuring hole and a calibration plane, the calibration plane is located inside the outer sleeve, and the object to be measured is suitable for being placed on the outer side of the outer sleeve and The relative position of the measuring hole; the lighting platform is set in the outer sleeve, and there is a through hole and a plurality of light-emitting elements on the lighting platform. The periphery of the through hole is used to emit light; one end of the inner sleeve is set at the center of the lighting platform and connects with the through hole, and the other end extends upwards parallel to the outer sleeve, and the light emitting element is located between the inner sleeve and the outer sleeve , and the emitted light is reflected upward between the outer sleeve and the inner sleeve, and emitted from the measuring hole; and a photosensitive element is arranged directly below the through hole, and the light emitted from the measuring hole is detected by the object to be measured and the measuring hole. After correcting the plane reflection, it reaches the photosensitive element through the inner sleeve and the through hole.

According to an embodiment of the present invention, the handheld double-tube multispectral camera device further includes a base, which is arranged at the bottom of the outer sleeve, or at the bottom of the outer sleeve and the inner sleeve to fix the outer sleeve and the inner sleeve tube, and the lighting platform is set on the base.

According to the embodiment of the present invention, the diameter of the measuring hole is smaller than the diameter of the top of the outer sleeve, and the calibration plane is set between the measuring hole and the wall of the outer sleeve to provide a calibration standard for light source calibration for the photosensitive element to perform light source calibration .

According to the embodiment of the present invention, the height of the inner sleeve is not higher than that of the outer sleeve, and can block the reflected light from the light source so that it does not directly irradiate the photosensitive element.

According to an embodiment of the present invention, the number of light emitting elements is an even number. The light-emitting elements are grouped in an evenly spaced arrangement, and the light-emitting elements contained in each group emit light of the same wavelength.

According to an embodiment of the present invention, the light-emitting elements are grouped by multiple points in a regular polygon, and the light-emitting elements contained in each group emit light of the same wavelength.

According to an embodiment of the present invention, the light-emitting element surrounds at least one circle with the through hole as the center.

According to an embodiment of the present invention, the inner wall of the outer sleeve and the outer wall of the inner sleeve further include a reflective layer for reflecting light.

According to an embodiment of the present invention, the reflective layer is coated with a diffuse reflective coating, attached with a reflective sheet or coated with a reflective film to reflect light.

According to an embodiment of the present invention, the calibration plane further includes a reflective layer, which is used to reflect light back to the photosensitive element by coating a diffuse reflective coating, attaching a reflective sheet, or coating a reflective film.

According to the embodiment of the present invention, the object to be tested and the calibration plane have a height difference, so that the object to be tested will not be affected by the reflected light of the calibration plane when it forms an image on the photosensitive element.

The present invention also provides a measurement method for a hand-held double-sleeve multi-spectral camera device, which includes the following steps: placing the object to be measured in front of the measurement hole; After reflection, the light is irradiated onto the calibration plane and the object to be measured outside the measuring hole; the light is reflected by the object to be measured and the calibration plane; and the reflected light is irradiated downward from the inner sleeve and irradiates on the photosensitive element through the through hole .

According to an exemplary embodiment of the invention, the light emitted by the light-emitting element is ideally reflected (Lambertian) between the outer sleeve and the inner sleeve.

According to the embodiment of the present invention, the reflected light of the calibration plane and the reflected light of the object to be measured are irradiated on the photosensitive element at the same time.

The present invention provides a hand-held double-sleeve multi-spectral camera device and its measurement method. It utilizes the double-sleeve reflected light and the design of setting a correction plane around the measurement hole, which can solve the problem that is not considered in the hand-held spectrometer in the prior art. There is no light source error, and there is no problem of light source correction.

Please refer to Fig. 1, Fig. 2 and Fig. 3 at the same time, which are respectively a perspective view, a side sectional view and a top view of the handheld double-tube multispectral camera device 10 of the present invention. The handheld dual-sleeve multispectral camera device 10 of the present invention includes an outer sleeve 12 , an illumination platform 14 , an inner sleeve 16 and a photosensitive element 18 . Wherein, the outer sleeve 12 is a two-section design, and the lower half is set on a base 20 with a larger area, so that the outer sleeve 12 can stand upright on a horizontal plane; the upper half is truncated conical, and the top is a truncated flat. A measuring hole 122 and a calibration plane 124 are arranged on the top of the outer sleeve 12. The diameter of the measuring hole 122 is smaller than the diameter of the top section of the outer sleeve 12. The calibration plane 124 is the tube between the measuring hole 122 and the outer sleeve 12. The section between the walls, and provided on the inner side of the section, provides calibration standards for the photosensitive element 18 to perform white balance calibration. The calibration standard can be, for example, a white or gray color card. In other words, the alignment plane 124 is a portion of the inner surface of the outer sleeve 12 . The object to be measured (not shown in the figure) is placed outside the measuring hole 122 and covers the measuring hole 122 .

In the embodiment of Figure 1, the outer sleeve 12 is arranged on the base 20, but in addition, the bottoms of the outer sleeve 12 and the inner sleeve 16 can be arranged on the base 20, for example, the inner sleeve 16 Pass through the lighting platform 14 and extend downwards to the base 20 , so that the base 20 can be used to fix the outer sleeve 12 and the inner sleeve 16 , making the base 20 a fixing mechanism for double sleeves.

The lighting platform 14 is arranged in the lower half of the outer sleeve 12, and a through hole 142 facing the measuring hole 122 is provided in the center of the lighting platform 14, and a plurality of light-emitting elements 144 are arranged around the periphery of the through hole 142 to serve as a ring. The light source emits light. In particular, the light-emitting elements 144 in the present invention may include a variety of light sources with different wavelengths for multi-band spectral analysis, and these light-emitting elements 144 with different wavelengths are grouped in a uniform grid distribution, for example , can be grouped two by two, and the number of light emitting elements 144 is an even number at this time. The two light-emitting elements 144 of the same wavelength are arranged at both ends of the diameter of the through hole 142 , and they are grouped at 180 degrees. Each group contains two light-emitting elements 144 that emit light of the same wavelength. In addition, the light-emitting elements 144 surround at least one circle with the through hole 142 as the center. As in the embodiment shown in FIGS. 1 and 3 , the light-emitting elements 144 are arranged in two circles inside and outside. However, the arrangement of the light-emitting elements 144 does not affect the lighting effect, as long as the opposite light-emitting elements 144 are of the same wavelength, so the arrangement of the light-emitting elements 144 is not limited by the present invention. Or even if three or more light-emitting elements 144 of the same wavelength are set, three are a group, four are a group, etc., as long as they are evenly distributed, such as arranged in a regular triangle, square, regular pentagon, etc. , can emit a uniform light source. However, if the light emitting elements 144 are grouped in odd numbers, the total number of light emitting elements 144 can be odd or even.

The inner sleeve 16 is a hollow tube, one end of which is located at the center of the lighting platform 14 and connected to the through hole 142 , and the other end extends upwards and is parallel to the outer sleeve 12 . In other words, the diameter of the inner sleeve 16 is the same as that of the through hole 142 . The through hole 142, the inner sleeve 16, and the measuring hole 122 are on the same straight line. The height of the inner sleeve 16 is not higher than that of the outer sleeve 12 , and can block the reflected light from the light source so that it will not directly irradiate the photosensitive element 18 . The light emitting element 144 is located between the inner sleeve 16 and the outer sleeve 12 , and the emitted light is reflected upwards between the outer sleeve 12 and the inner sleeve 16 . In this embodiment, the inner wall of the outer sleeve 12, the outer wall of the inner sleeve 16, and the correction plane 124 may further include a reflective layer (not shown in the figure) to apply a diffuse reflective paint, attach a reflective sheet or It can be formed by coating a reflective film, etc., and the best one is to apply a diffuse reflection coating to make the light pass through the diffuse reflection more uniformly and improve the effect of light reflection. Therefore, the light emitted by the light emitting element 144 will be reflected upwards through the reflective layer between the outer sleeve 12 and the inner sleeve 16 , and the reflection is ideal (Lambertian). Finally, it shoots out from the measuring hole 122 . The photosensitive element 18 is located directly below the through hole 142 , and the light emitted from the measuring hole 122 is reflected by the object to be measured, then irradiates vertically downward, and then irradiates on the photosensitive element 18 through the inner sleeve 16 and the through hole 142 . At the same time, after the light emitted by the light-emitting element 144 is reflected between the outer sleeve 12 and the inner sleeve 16, part of it will irradiate on the correction plane 124 and be reflected by the correction plane 124, and also irradiate vertically downward and pass through the inner sleeve 16. And the through hole 142 illuminates on the photosensitive element 18 .

Since the photosensitive element 18 is placed under the inner sleeve 16, and the outer sleeve 12 shields the external ambient light source, the photosensitive element 18 will not be affected by the external light source, and because the inner sleeve 16 extends to the vector measuring hole 122, the built-in The ring-shaped light source will not be reflected to the photosensitive element 18 before it irradiates the object under test, so the photosensitive element 18 can directly receive the reflected light energy reflected by the object under test at the measuring hole 122 without being affected by the energy of other light sources.

The present invention also provides a measurement method of a hand-held double-tube multi-spectral camera device 10. Please also refer to the embodiment in FIG. After the light-emitting element 144 emits light, as shown by the arrow in the figure, the light is reflected between the outer sleeve 12 and the inner sleeve 16 , and finally irradiates on the calibration plane 124 and the object 22 to be measured. The reflected light from the calibration plane 124 and the object under test 22 irradiates vertically downwards, and irradiates on the photosensitive element 18 through the inner sleeve 16 and the through hole 142 . FIG. 5 is a schematic diagram of the imaging of the photosensitive element 18 in the embodiment of FIG. 4 . It can be clearly seen from the figure that the image of the calibration plane 124 and the object 22 to be tested will appear on the photosensitive element 18 at the same time. Therefore, since the object under test 22 and the calibration plane 124 are almost on the same plane during measurement, with only a slight difference in height, the photosensitive element 18 located under the inner sleeve 16 can simultaneously receive reflections from the measurement hole 122 and the calibration plane 124 Energy, after the diffuse reflective paint is applied on the calibration plane 124, the reflected energy of the calibration plane 124 can be used as the reference energy of white calibration for spectrum measurement, so that the reference energy of white calibration can be obtained when measuring the object 22 under test. White calibration is to correct the energy of the maximum reflection intensity of the light source during measurement. Therefore, the present invention can obtain the object under test 22 and the reference energy of white calibration at the same time, which can effectively reduce the error of the light source.

Fig. 6 is an enlarged schematic diagram of a thickness between the calibration plane and the measurement hole in the handheld double-tube multispectral camera device of the present invention. There is a height difference d between the calibration plane 124 and the position of the object under test 22 , which can prevent the object under test 22 from causing interference when the photosensitive element 18 forms an image.

第一次碰撞至第一平面

，經理想反射後之光強分佈，可切割為

個點光源。假設其每網格光強度皆為該網格之平均值，即網格光強以

表示之，如第8圖所示。同理，將第二平面

切割為

個接收面，則照度值

之分佈如下式（1）所示，其中

光通量（lm）、

為

到

之距離（mm）、

為第一平面

反射率（%）。在不考慮光線經

反射至

之來回多次理想反射情況下，第二平面

之照度均勻度可表示為下式（2）。並且在接續碰撞之平面皆受到此照度均勻化影響，因此可均勻光源之能量至量測位置，做為光源均勻化後的量測光源。

（1）

（2） The ideal reflection of light between the inner sleeve 16 and the outer sleeve 12 is as follows. Please refer to Figure 7, consider any light angle of light emitting element 144

first collision to first plane

, the manager wants to reflect the light intensity distribution, which can be cut as

point light source. Assume that the light intensity of each grid is the average value of the grid, that is, the grid light intensity is

Express it, as shown in Figure 8. Similarly, the second plane

cut as

receiving surface, the illuminance value

The distribution is shown in the following formula (1), where

Luminous flux (lm),

for

arrive

distance (mm),

for the first plane

Reflectivity(%). without considering the light

reflected to

In the case of multiple round-trip ideal reflections, the second plane

The uniformity of illumination can be expressed as the following formula (2). And the planes of successive collisions are all affected by the uniformity of illumination, so the energy of the light source can be uniformed to the measurement position, which can be used as the measurement light source after the light source is uniformed.

(1)

(2)

Therefore, with the hand-held double-tube multi-spectral camera device and its measurement method provided by the present invention, the light emitted by the light source is continuously reflected between the inner and outer tubes, so that the light irradiated on the object to be measured more evenly. In addition, the inner and outer tubes are used to shield stray light. The external light source is shielded by the outer tube, while the internally reflected light is shielded by the inner sleeve, so that the light reflected by the object to be measured is directly irradiated to the photosensitive element through the inner tube. , which can prevent the light from the external light source and the ring light source from directly irradiating the photosensitive element during reflection and affecting the measurement results. Furthermore, the present invention can solve the problem of light source error in the prior art. It is to set a calibration plane on almost the same plane around the measuring hole, and set some slight height differences between the object to be measured and the calibration plane, and then Apply diffuse reflection paint on the calibration plane, so that the calibration plane will also reflect light when measuring the object to be measured, and can simultaneously measure the light source to correct the reflected energy intensity, reduce the error caused by the light source, and the height between the object to be measured and the calibration plane The difference can make the object under test not be affected by the reflected light of the calibration plane when it forms an image on the photosensitive element.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications based on the features and spirit described in the scope of the application of the present invention shall be included in the scope of the patent application of the present invention.

10: Handheld double-sleeve multispectral camera device 12: Outer sleeve 122: Measuring hole 124: Correction plane 14: Lighting platform 142: Through hole 144: Light emitting element 16: inner sleeve 18: photosensitive element 20: base 22: The object to be tested

上之網格位置示意圖。 Figure 1 is a perspective view of the handheld double-tube multispectral camera device of the present invention. Fig. 2 is a side sectional view of the handheld double-tube multispectral camera device of the present invention. Fig. 3 is a top view of the handheld double-tube multispectral camera device of the present invention. Fig. 4 is a schematic diagram of an embodiment of the light path of the handheld double-tube multispectral camera device of the present invention. Fig. 5 is a schematic diagram of the imaging of the photosensitive element in the embodiment of Fig. 4 . Fig. 6 is an enlarged schematic diagram of a height difference between the calibration plane and the measurement hole in the handheld double-tube multispectral camera device of the present invention. Figure 7 is a schematic diagram of a point light source where light is ideally reflected between the inner sleeve and the outer sleeve. Figure 8 shows that the light source illuminates the plane

Schematic diagram of the grid position above.

10: Handheld double-sleeve multispectral camera device

12: Outer sleeve

122: Measuring hole

124: Correction plane

14: Lighting platform

142: Through hole

144: Light emitting element

16: inner sleeve

20: base

Claims (18)

A hand-held double-sleeve multi-spectral camera device is suitable for measuring an object to be measured. The hand-held double-sleeve multi-spectral camera device includes: An outer sleeve, the top of which is provided with a measuring hole and a calibration plane, wherein the calibration plane is located inside the outer sleeve, and the object to be measured is suitable for being placed on the outer side of the outer sleeve opposite to the measuring hole Location; A lighting platform is arranged in the outer sleeve, and the lighting platform is provided with a through hole and a plurality of light emitting elements, wherein the through hole is set at the center of the lighting platform and faces the measuring hole, and the light emitting elements are surrounded by provided on the periphery of the through hole for emitting light; An inner sleeve, one end of which is arranged at the center of the lighting platform and connected to the through hole, and the other end extends upwards parallel to the outer sleeve, wherein the light-emitting elements are located between the inner sleeve and the outer sleeve and the emitted light is reflected upwards between the outer sleeve and the inner sleeve and exits from the measuring hole; and A photosensitive element is arranged directly under the through hole, and the light emitted from the measuring hole is reflected by the object to be measured and the calibration plane, and reaches the photosensitive element through the inner sleeve and the through hole. The handheld double-sleeve multi-spectral camera device as described in claim 1 further includes a base, which is arranged at the bottom of the outer sleeve, or at the bottom of the outer sleeve and the inner sleeve to fix the outer sleeve. The sleeve and the inner sleeve, and the lighting platform is arranged on the base. The handheld double-sleeve multi-spectral camera device as described in Claim 1, wherein the aperture of the measuring hole is smaller than the diameter of the top of the outer sleeve, and the calibration plane is set on the measuring hole and the sleeve of the outer sleeve Between the walls, a calibration standard for light source calibration is provided for the photosensitive element to perform white calibration. The handheld double-sleeve multi-spectral camera device as described in Claim 1, wherein the height of the inner sleeve does not exceed the height of the outer sleeve, and blocks the reflected light from the light source so that it does not directly irradiate between the photosensitive elements . The handheld dual-sleeve multispectral camera device as described in Claim 1, wherein the light-emitting elements are grouped in an arrangement of uniform grid distribution, and the light-emitting elements contained in each group emit light of the same wavelength . The handheld dual-tube multi-spectral camera device as described in Claim 1, wherein the light emitting elements are grouped by multiple points in a regular polygon, and the light emitting elements contained in each group emit light of the same wavelength. The handheld dual-tube multi-spectral camera device as described in claim 1, wherein the light-emitting elements surround the through hole at least once. The handheld dual-sleeve multispectral camera device as described in claim 1, wherein the inner wall of the outer sleeve further includes a reflective layer for reflecting light. The handheld dual-sleeve multispectral camera device as described in Claim 8, wherein the reflective layer is coated with diffuse reflective paint, attached with a reflective sheet or plated with a reflective film. The handheld dual-tube multi-spectral camera device as described in Claim 1, wherein the outer wall of the inner tube further includes a reflective layer for reflecting light. The handheld dual-sleeve multispectral camera device as described in Claim 10, wherein the reflective layer is coated with diffuse reflective paint, attached with a reflective sheet or plated with a reflective film. The handheld dual-tube multispectral camera device as described in Claim 1, wherein the calibration plane further includes a reflective layer for reflecting light. The handheld dual-sleeve multispectral camera device as described in claim 12, wherein the reflective layer is coated with diffuse reflective paint, attached with a reflective sheet or plated with a reflective film. The handheld dual-sleeve multispectral camera device as described in Claim 1, wherein there is a height difference between the object under test and the calibration plane. A measurement method for the handheld dual-sleeve multispectral camera device described in item 1 of the application request, comprising the following steps: Place the object to be measured in front of the measuring hole; The light emitting elements emit light, and after being reflected between the inner sleeve and the outer sleeve, the light is irradiated to the calibration plane and the object to be measured outside the measuring hole; the object under test and the calibration plane reflect light; and The reflected reflected light irradiates downward from the inner sleeve, and irradiates on the photosensitive element through the through hole. The measurement method of the handheld dual-tube multi-spectral camera device as described in Claim 15, wherein the light emitted by the light-emitting elements is ideally reflected (Lambertian) between the outer sleeve and the inner sleeve. The measuring method of the handheld dual-tube multi-spectral camera device according to claim 15, wherein the reflected light of the calibration plane and the reflected light of the object to be measured are irradiated on the photosensitive element at the same time. The measurement method of the handheld double-tube multi-spectral camera device as described in claim 15, wherein there is a height difference between the object to be measured and the calibration plane.

Images