CN211825659U

CN211825659U - Optical measuring device

Info

Publication number: CN211825659U
Application number: CN201922304997.0U
Authority: CN
Inventors: 潘建根; 黄艳; 蔡欢庆
Original assignee: Hangzhou Everfine Photo E Info Co Ltd
Current assignee: Hangzhou Everfine Photo E Info Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-10-30
Anticipated expiration: 2029-12-20

Abstract

The utility model discloses an optical measuring device, which comprises a measured sample, a first lens group, a digital micromirror unit and a broadband photoelectric receiving unit; and the light of the tested sample is imaged to the digital micromirror unit through the first lens group, and the light is reflected to the broadband photoelectric receiving unit through the digital micromirror unit to carry out photoelectric information measurement. The photoelectric information of all or partial areas of the light in a specific wavelength band can be measured, and a measurement result with higher accuracy is obtained.

Description

Optical measuring device

Technical Field

The utility model relates to a photoelectric test field, concretely relates to optical measurement device.

Background

The application fields of optical measuring devices are very wide, including industry, transportation, military industry, public safety, medical treatment, household lighting equipment and the like. The optical measurement range includes brightness, chromaticity, luminance, spectrum, etc., which are not exemplified here. In the prior art, in optical measurement, a photoelectric detector is generally used to directly measure the whole of a sample to be measured, or a window and mechanical movement are used to gradually scan and measure a part of the sample to be measured. In this measurement mode, the problem of low resolution exists when the whole optical measurement is carried out; if the mechanical scanning is adopted for gradual measurement, the problems of picture loss and low accuracy exist, and the measurement of images is considered in different test modes. Therefore, how to combine the resolution and accuracy of photoelectric measurement and the image information of the corresponding measurement target in the optical measurement is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides an optical measurement device aims at solving the technical problem of the resolution ratio of current optical measurement device, the technical problem of the degree of accuracy optimization.

The utility model discloses an optical measuring device, which comprises a measured sample, a first lens group, a digital micromirror unit and a broadband photoelectric receiving unit; and the light of the tested sample is imaged to the digital micromirror unit through the first lens group, and the light is reflected to the broadband photoelectric receiving unit through the digital micromirror unit to carry out photoelectric information measurement.

The utility model discloses an optical measurement device, the light that is surveyed the sample and sends is through first battery of lens formation of image to digital micromirror unit to through digital micromirror unit, the selective whole or regional light that will be surveyed the sample jets into broadband photoelectric receiving unit and measures. The broadband photoelectric receiving unit can measure the photoelectric information of all or partial area light in a specific wavelength band, and a measurement result with higher accuracy is obtained.

Generally, the digital micromirror unit is composed of several moving mirrors arranged in an array, and the size of the moving mirrors can determine the resolution of the final image; and incident light received by each area on the digital micromirror unit can be selectively reflected by the rotation of the movable mirror. The utility model discloses a set up digital micro mirror unit, can further optimize the resolution ratio of measuring result, digital micro mirror unit's the movable mirror size is about little resolution ratio higher. .

In some optional embodiments, the broadband photoreceiving unit comprises a color filter and a broadband photodetector which are correspondingly arranged in sequence, wherein the color filter and the broadband photodetector are one or more. The filter is arranged in front of the broadband photoelectric detector, so that the measurement wave band can be effectively limited, stray light can be filtered, photoelectric information of each region in each wavelength band can be respectively obtained, and a more accurate measurement result can be obtained.

Optionally, more than one color filter and broadband photodetector which are correspondingly arranged cover different and overlapping wavelength bands.

In some optional embodiments, the broadband photoelectric receiving unit comprises a second lens group, a diaphragm, and one or more color filters and the broadband photoelectric detector, which are arranged in sequence. The light reflected by the digital micromirror unit is coupled to the diaphragm through the second lens group, and passes through the exit pupil of the diaphragm, and the light of the exit pupil uniformly enters the broadband photoelectric detector after passing through the color filter.

Optionally, the object image conjugate relationship between the detected sample and the digital micromirror unit is formed by the first lens group; the aperture of the first lens group passes through the second lens group and the receiving surface of the broadband photoelectric detector, and is in object-image conjugate relation. The conjugated arrangement can ensure the stable definition of the object image and is beneficial to the measurement.

In some alternative implementations, the broadband photodetector is a photomultiplier tube or a silicon photocell. The photomultiplier has the advantages of low noise, high sensitivity, quick response and the like.

In some optional implementations, the broadband photoelectric detector further includes N pieces of N-pulling optical fibers, an incident end of each N piece of N-pulling optical fibers is disposed on a light-emitting surface of the diaphragm, N pieces of color filters (43) and N pieces of broadband photoelectric detectors are respectively disposed at N emitting ends of the optical fibers, and N is a positive integer greater than 1; the N color filter coverage wavelength bands are different or overlapped. In order to meet the measurement requirements of different wave bands, N broadband photoelectric detectors are connected through one-to-N optical fibers, and color filters with different or overlapped wave bands are arranged in front of each broadband photoelectric detector so as to meet the test requirements of each wave band.

Illustratively, 3 color filters and 3 broadband photodetectors are included, and the optical path is accessed through one-to-three optical fibers. The color filters before 3 can be respectively a red color filter, a green color filter and a blue color filter (or an X \ Y \ Z color filter). This is by way of example only and not intended to be limiting.

In some alternative implementations, the imaging measurement unit includes a third lens group and an image sensor. And the light emitted from the digital micromirror unit is imaged to a receiving surface of the image sensor through the third lens group for measurement.

In some alternative implementations, the image sensor is a CCD or CMOS image sensor. The type of image sensor can be selected according to different imaging requirements. This is merely an example and is not intended to be limiting.

In some alternative implementations, the sample under test is a light emitting object or an illuminated object. The utility model provides an optical measurement device's measurement object is not restricted to luminous object, and the object of being lighted is also the term the utility model discloses an one of measurement range.

Drawings

Fig. 1 is a schematic light path diagram of an optical measurement apparatus provided in an embodiment of the present invention;

fig. 2 is a schematic optical path diagram of another optical measurement apparatus provided in an embodiment of the present invention;

fig. 3 is a schematic optical path diagram of another optical measurement apparatus provided in an embodiment of the present invention;

fig. 4 is a schematic light path diagram of another optical measurement apparatus according to an embodiment of the present invention.

Detailed Description

Example 1

The embodiment of the utility model provides an optical measurement device, as shown in fig. 1, including the sample 1 to be measured, first lens group 2, digital micromirror unit 3 and broadband photoelectric receiving unit 4; the light of the tested sample 1 is imaged to the digital micro-mirror unit 3 through the first lens group 2, and the light is reflected to the broadband photoelectric receiving unit 4 through the digital micro-mirror unit 3 for measurement.

Example 2

The embodiment of the utility model provides an optical measurement device, as shown in FIG. 2, including being surveyed sample 1, first lens group 2, digital micro mirror unit 3 and broadband photoelectric receiving unit 4. The broadband photoelectric receiving unit 4 includes a second lens group 41, a stop 42, a color filter 43, and a broadband photodetector 44, which are arranged in this order. The light of the detected sample 1 is imaged to the digital micromirror unit 3 through the first lens assembly 2, the reflected light of the digital micromirror unit 3 is coupled to the diaphragm 42 through the second lens assembly 41, and the light passing through the exit pupil of the diaphragm 42 is uniformly incident to the broadband photoelectric detector 44 after passing through the color filter 43. Wherein, the tested sample 1 is in conjugate relation with the digital micromirror unit 3 via the first lens group 2; the aperture of the first lens group 2 is in conjugate relation with the receiving surface of the broadband photodetector 44 via the second lens group 41.

Example 3

The embodiment of the utility model provides an optical measurement device, as shown in fig. 3, including the sample 1 to be measured, first lens group 2, digital micromirror unit 3, broadband photoelectric receiving unit 4 and imaging measurement unit 5; the light of the tested sample 1 is imaged to the digital micromirror unit 3 through the first lens group 2, and the light is reflected to the broadband photoelectric receiving unit 4 or the imaging measuring unit 5 respectively through the rotating digital micromirror unit 3 for measurement.

The broadband photoelectric receiving unit 4 includes a second lens group 41, a stop 42, a color filter 43, and a broadband photodetector 44, which are arranged in this order. The imaging measurement unit 5 includes a third lens group 51 and an image sensor 52, and light emitted from the digital micromirror unit 3 is imaged to a receiving surface of the image sensor 44 through the third lens group. The optical measurement device can realize both high-resolution photoelectric and image measurement.

Example 4

The embodiment of the utility model provides an optical measurement device, as shown in fig. 4, including the sample 1 to be measured, first lens group 2, digital micromirror unit 3, broadband photoelectric receiving unit 4 and imaging measurement unit 5; the light of the tested sample 1 is imaged to the digital micromirror unit 3 through the first lens group 2, and the light is reflected to the broadband photoelectric receiving unit 4 or the imaging measuring unit 5 respectively through the rotating digital micromirror unit 3 for measurement.

The broadband photoelectric receiving unit 4 includes a second lens group 41, a diaphragm 42, three-by-one optical fiber 45, and one or more broadband photodetectors 44 (3 in the example in the figure) which are arranged in sequence; each broadband photodetector 44 is correspondingly provided with a color filter 43; the incident end of the one-to-three optical fiber 45 is connected with the light-emitting surface of the diaphragm 42, and the emergent end is respectively connected with the color filter 43 and the broadband photoelectric detector 44; the wavelength bands covered by the color filters 43 correspondingly disposed in front of the three broadband photodetectors 44 overlap or are different. The imaging measurement unit 5 includes a third lens group 51 and an image sensor 52, and light emitted from the digital micromirror unit 3 is imaged to a receiving surface of the image sensor 44 through the third lens group.

While the present invention has been described with reference to the embodiments, it will be understood by those skilled in the art that the above embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of protection of the invention is defined by the appended claims.

Claims

1. An optical measuring device is characterized by comprising a measured sample (1), a first lens group (2), a digital micro-mirror unit (3) and a broadband photoelectric receiving unit (4);

the light of the tested sample (1) is imaged to the digital micro-mirror unit (3) through the first lens group (2), and the light is reflected to the broadband photoelectric receiving unit (4) through the digital micro-mirror unit (3) for measurement.

2. An optical measuring device as claimed in claim 1, characterized in that the broadband photoreceiving unit (4) comprises a color filter (43) and a broadband photodetector (44) arranged in sequence in correspondence, wherein the color filter (43) and the broadband photodetector (44) are one or more.

3. An optical measuring device as claimed in claim 2, characterized in that said broadband photoreceiving unit (4) further comprises, in succession, a second lens group (41), a diaphragm (42), and one or more of said color filter (43) and said broadband photodetector (44).

4. An optical measuring device as claimed in claim 2 or 3, characterized in that the broadband photodetector (44) is a photomultiplier or a silicon photocell.

5. An optical measuring device as claimed in claim 3, characterized in that it further comprises a N-by-N optical fiber (45), said broadband photodetectors (44) being N; the incident end of the N-pulling optical fiber (45) is connected with the light-emitting surface of the diaphragm, N light-emitting ends of the N-pulling optical fiber (45) are respectively provided with N color filters (43) and N broadband photodetectors (44), and N is a positive integer greater than 1; wherein the N color filters (43) are different in wavelength band or overlap each other.

6. An optical measuring device as claimed in claim 1, further comprising an imaging measuring unit (5), the imaging measuring unit (5) comprising a third lens group (51) and an image sensor (52); the light emitted from the digital micro-mirror unit (3) is imaged to a receiving surface of the image sensor (52) through the third lens group (51) for measurement.

7. An optical measuring device as claimed in claim 6, characterized in that the image sensor (52) is a CCD or CMOS image sensor.

8. An optical measuring device as claimed in claim 1, characterized in that the sample (1) to be measured is a light-emitting object or an illuminated object.