CN116448239A

CN116448239A - Low-light radiation brightness source and low-light generation method

Info

Publication number: CN116448239A
Application number: CN202310321144.6A
Authority: CN
Inventors: 吴志峰; 李玲; 代彩红; 孙若端; 何思捷; 王彦飞; 程秋桐
Original assignee: National Institute of Metrology
Current assignee: National Institute of Metrology
Priority date: 2023-03-29
Filing date: 2023-03-29
Publication date: 2023-07-18
Anticipated expiration: 2043-03-29
Also published as: CN116448239B

Abstract

The invention provides a low-light radiation brightness source and a low-light generation method, which relate to the technical field of optics, and the low-light radiation brightness source comprises: the device comprises an integrating sphere light source, a diaphragm, a first diffuse reflection plate and a controller. According to the low-light-level radiation brightness source and the low-light-level generation method, the low-light-level radiation brightness source can be more accurately and continuously adjustable in multiple orders of magnitude by controlling at least one of the first distance between the diaphragm and the first diffuse reflection plate, the radius of the diaphragm, the reflectivity of the first diffuse reflection plate and the spectral radiation brightness of the integrating sphere light source, the low-light-level radiation brightness source can be continuously adjustable in multiple orders of magnitude and can maintain spectral consistency, calibration devices such as a detector are not needed, the spectral radiation brightness of the low-light radiation brightness source can be more accurately calibrated, the low-light-level radiation brightness source is simple in structure, the equipment cost required to be input is lower, and the space required for arranging the low-light radiation brightness source is smaller.

Description

Low-light radiation brightness source and low-light generation method

Technical Field

The invention relates to the technical field of optics, in particular to a low-light-level radiation brightness source and a low-light-level generation method.

Background

Dim light detection mainly involves spectral radiation measurement of a detection target under dim light conditions. A glimmer measuring device generally refers to a device that can measure the spectral radiance or spectral radiance of a detection target under glimmer conditions. Wherein, the radiance of the glimmer spectrum is an important physical parameter for glimmer detection.

The spectrum radiation brightness can be continuously adjustable in a plurality of orders, and the spectrum radiation brightness source has important significance for high-precision calibration of the micro-light measuring device and improvement of the measuring accuracy of the micro-light measuring device.

However, prior art low-light-emission brightness sources have difficulty in achieving continuous adjustability of spectral emission brightness over multiple orders of magnitude. Therefore, how to realize continuous adjustment of the spectral radiance of the micro-light radiance source in multiple orders is a technical problem to be solved in the field.

Disclosure of Invention

The invention provides a low-light-level radiation brightness source and a low-light-level generation method, which are used for solving the defect that the low-light-level radiation brightness source in the prior art is difficult to realize continuous adjustment of spectrum radiation brightness in a plurality of orders of magnitude and realizing continuous adjustment of spectrum radiation brightness of the low-light-level radiation brightness source in the plurality of orders of magnitude.

The invention provides a low-light radiation brightness source, comprising: the device comprises an integrating sphere light source, a diaphragm, a first diffuse reflection plate and a controller; the radius of the diaphragm is smaller than the radius of the light outlet of the integrating sphere light source;

The integrating sphere light source, the diaphragm and the first diffuse reflection plate are arranged along a first light path, the first light path passes through the center of the light outlet plane of the integrating sphere light source, the center of the diaphragm and the center of the first diffuse reflection plate, and the first light path coincides with the normal line of the light outlet plane of the integrating sphere light source, the normal line of the diaphragm plane and the normal line of the first diffuse reflection plate;

the controller is used for controlling at least one of a first distance, the spectrum radiation brightness of the integrating sphere light source, the radius of the diaphragm and the reflectivity of the first diffuse reflection plate based on the target spectrum radiation brightness and a first target mapping relation under the condition that the target spectrum radiation brightness is acquired, and calibrating the spectrum radiation brightness of the first diffuse reflection plate to be the target spectrum radiation brightness under the condition that the control is completed based on the target spectrum radiation brightness and the first target mapping relation;

wherein the first distance refers to a distance between the diaphragm and the first diffuse reflection plate; the first target mapping relationship is used for describing a mapping relationship between the spectral radiance of the first diffuse reflection plate, the first distance, the reflectivity of the first diffuse reflection plate, the radius of the diaphragm and the spectral radiance of the integrating sphere light source.

According to the invention, a micro-light radiation brightness source is provided, which further comprises: the first slide rail and the first fixing device; the first fixing device is connected with the controller;

the first sliding rail extends along the propagation direction of the first light path, and the first fixing device is movably arranged on the first sliding rail along the extension direction of the first sliding rail;

the first fixing device is used for fixing the diaphragm and responding to the control of the controller to drive the diaphragm to slide on the first sliding rail.

According to the low-light radiation brightness source provided by the invention, the number of the diaphragms is multiple, and the radiuses of any two diaphragms are different; the first fixing device comprises a first switching mechanism;

the first switching mechanism is used for fixing each diaphragm and responding to the control of the controller, and switches diaphragms with different radiuses to the center point of the diaphragm when the normal line of the diaphragm plane coincides with the first light path.

According to the low-light radiation brightness source provided by the invention, the number of the first diffuse reflection plates is multiple, and the reflectivity of any two first diffuse reflection plates is different; the micro-light radiation brightness source further comprises: a second switching mechanism;

The second switching mechanism is used for fixing each first diffuse reflection plate and responding to the control of the controller, and switching the first diffuse reflection plates with different reflectivities to the center point of the first diffuse reflection plates, wherein the normal line of the plane where the first diffuse reflection plates are located coincides with the first light path.

According to the low-light-level radiation brightness source provided by the invention, the spectrum radiation brightness of the integrating sphere light source is preset spectrum radiation brightness;

the controller is further configured to control at least one of the first distance, the radius of the diaphragm, and the reflectivity of the first diffuse reflection plate based on the preset spectral radiance, the target spectral radiance, and the first target mapping relationship, and after the control is completed, calibrate the spectral radiance of the first diffuse reflection plate to the target spectral radiance.

According to the low-light radiation brightness source provided by the invention, the reflectivity of the first diffuse reflection plate is preset reflectivity;

the controller is further configured to control the first distance and/or the radius of the diaphragm based on the preset spectral radiance, the target spectral radiance, the preset reflectivity, and the first target mapping relationship, and after the control is completed, calibrate the spectral radiance of the first diffuse reflection plate to the target spectral radiance.

According to the invention, a micro-light radiation brightness source is provided, which further comprises: a closed housing;

the integrating sphere light source, the diaphragm and the first diffuse reflection plate are all arranged in the closed shell.

According to the invention, a micro-light radiation brightness source is provided, which further comprises: a second diffuse reflection plate;

the first diffuse reflection plate and the second diffuse reflection plate are arranged along a second light path, the first light path and the second light path intersect at the center point of the first diffuse reflection plate, and the second light path passes through the center point of the second diffuse reflection plate;

the controller is further configured to control at least one of the first distance, the second distance, the radius of the diaphragm, the reflectivity of the first diffuse reflection plate, the spectral radiance of the integrating sphere light source, the reflectivity of the second diffuse reflection plate, the area of the first diffuse reflection plate, the angle between the normal of the first diffuse reflection plate and the second optical path, and the angle between the normal of the second diffuse reflection plate and the second optical path based on the target spectral radiance and a second target mapping relationship, and after the control is completed, calibrate the spectral radiance of the second diffuse reflection plate to be the target spectral radiance;

Wherein the second distance refers to a distance between the second diffuse reflection plate center point and the first diffuse reflection plate center point; the second target mapping relationship is used for describing a mapping relationship between the spectral radiance of the second diffuse reflection plate, the first distance, the second distance, the radius of the diaphragm, the reflectivity of the first diffuse reflection plate, the spectral radiance of the integrating sphere light source, the reflectivity of the second diffuse reflection plate, the area of the first diffuse reflection plate, the included angle between the normal line of the first diffuse reflection plate and the second light path, and the included angle between the normal line of the second diffuse reflection plate and the second light path.

According to the invention, a micro-light radiation brightness source is provided, which further comprises: the second slide rail and the second fixing device; the second fixing device is connected with the controller;

the second sliding rail extends along the propagation direction of the second light path, and the second fixing device is movably arranged on the second sliding rail along the extension direction of the second sliding rail;

the second fixing device is used for fixing the second diffuse reflection plate and responding to the control of the controller to drive the second diffuse reflection plate to slide on the second sliding rail.

The invention also provides a low-light level generating method based on the low-light level radiation brightness source, which comprises the following steps:

acquiring target spectrum radiation brightness;

controlling at least one of a first distance, a spectral radiance of the integrating sphere light source, a radius of the diaphragm, and a reflectivity of the first diffuse reflection plate;

calibrating the spectrum radiation brightness of the first diffuse reflection plate to be the target spectrum radiation brightness;

The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing any one of the above methods for generating low light level when executing the program.

The invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method of generating a low light level as described in any of the above.

The invention also provides a computer program product comprising a computer program which, when executed by a processor, implements a method of generating a low light level as described in any one of the above.

According to the low-light-level radiation brightness source and the low-light-level generation method, the low-light-level radiation brightness source can realize that the spectrum radiation brightness in a plurality of orders is more accurately and continuously adjustable only by controlling at least one of the first distance between the diaphragm and the first diffuse reflection plate, the radius of the diaphragm, the reflectivity of the first diffuse reflection plate and the spectrum radiation brightness of the integrating sphere light source, the low-light-level radiation brightness source can maintain spectrum consistency while realizing that the spectrum radiation brightness in a plurality of orders is continuously adjustable, the calibrating device such as a detector is not needed, the spectrum radiation brightness of the low-light radiation brightness source can be calibrated more accurately, the low-light-level radiation brightness source is simple in structure, the equipment cost required to be input is lower, and the space required for arranging the low-light-level radiation brightness source is smaller.

Drawings

In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a micro-light radiation brightness source according to the present invention;

FIG. 2 is a graph showing the reflectance of the first diffuse reflection plate at 400nm to 1000nm (0, 45) in the spectral radiance calibration apparatus provided by the present invention;

FIG. 3 is a schematic diagram of a micro-light radiation brightness source according to a second embodiment of the present invention;

FIG. 4 is a flow chart of a method for generating micro-light according to the present invention;

fig. 5 is a schematic structural diagram of an electronic device provided by the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be noted that low light level is a series of electromagnetic waves with low energy in the natural light range. Low-light detection at wavelengths of 400nm to 1000nm has become an emerging research direction.

Spectral radiance (spectral radiance), which is the radiance in the unit wavelength width range, is W/(m) ² ·sr·μm)。

The glimmer detection mainly relates to spectral radiance measurement of a detection target under glimmer conditions.

The remote sensing data collected at night by the low-light load carried by the remote sensing satellite can provide data support for monitoring urban development, population change, energy consumption and the like. However, the spectrum radiation brightness of the remote sensing satellite when the remote sensing satellite collects the remote sensing data at night is lower by more than 6 orders of magnitude than the spectrum radiation brightness of the remote sensing satellite when the remote sensing satellite collects the remote sensing data at daytime, so that the traditional remote sensing satellite is difficult to collect the remote sensing data at night.

A glimmer measuring device generally refers to a device that can measure the spectral radiance or spectral radiance of a detection target under glimmer conditions.

Conventional spectral radiance sources include a tungsten-bromine lamp whiteboard system and an integrating sphere light source.

The bromine tungsten lamp in the white board system is a spectrum radiation illuminance light source, and when the light irradiates on the white board with good lambertian characteristics, the white board can be regarded as a uniform radiation brightness source. The irradiance calibration distance for international tungsten-bromine lamps is typically 50cm, at which distance the tungsten-bromine lamp may be approximated as a point source. According to the inverse square law, under the condition that the distance between the bromine tungsten lamp and the white board reaches 500cm, the spectrum radiation brightness generated by the white board system of the bromine tungsten lamp is reduced to one percent of the spectrum radiation brightness under 50 cm.

In a bromine tungsten lamp whiteboard system, the spectrum of the bromine tungsten lamp and the spectrum of the whiteboard have spectrum consistency.

However, the adjustment amplitude of the spectral radiance of the bromine tungsten lamp whiteboard system is only 100 times (2 orders of magnitude), and one ten thousandth (4 orders of magnitude) of the spectral radiance at 50cm can be realized unless the distance between the bromine tungsten lamp and the whiteboard is continuously increased to be more than 50 meters. While a length of 50 meters is extremely high for laboratory requirements and is often difficult to achieve. If one wants to further reduce the spectral radiance of a tungsten-bromine whiteboard system to one part per million or less, the tungsten-bromine whiteboard system is not realized.

The integrating sphere light source is composed of at least one integrating sphere and an internal or external light source. The built-in light source is positioned inside the integrating sphere, and the external light source is positioned outside the integrating sphere.

In the case of built-in light sources, the integrating sphere light source can adjust the spectral radiance by changing the number of built-in light sources, or changing the power of the built-in light sources.

When the power of the built-in light source is changed, the spectrum power distribution of the integrating sphere light source can be obviously changed; when the number of built-in light sources is changed, the adjustment of the spectrum radiation brightness is extremely limited, the spectrum power distribution among different built-in light sources is difficult to be consistent, and the light sources with close spectrums are required to be selected from a large number of light sources.

Under the condition that the light source is external, a variable slit is adopted between the external light source and the integrating sphere to adjust, and the light quantity entering the integrating sphere is adjusted by changing the size of the slit, so that the adjustment of the spectrum radiation brightness of the integrating sphere light source is realized.

In the case of a combination of external and internal light sources, which also involves the problem of choosing the light sources, it is necessary to ensure consistency between the internal and external light sources.

Furthermore, the cascade integrating sphere, that is, more than two integrating spheres are connected, can also reduce the spectral radiance of the integrating sphere light source.

However, when the slit sizes of the external light source and the integrating sphere light source are changed, the internal structure of the integrating sphere is changed. Except the light radiation which directly enters the integrating sphere through the slit, other light emitted by the light source is reflected for multiple times by the surface of the slit and the inner wall of the cavity packaged by the external light source, and then enters the integrating sphere through the slit. When the slit size is large, the ratio of directly incident light and reflected light may be on the order of several hundred times or more; when the slit becomes smaller, the larger the light radiation ratio entering the integrating sphere through multiple reflections, the larger the influence on the spectral change entering the integrating sphere.

In addition, polytetrafluoroethylene materials or barium sulfate materials are adopted in the integrating sphere, and the reflectivity of the integrating sphere is approximately 1; the slit is made of metal material, the surface reflection characteristic of the slit is different from the internal of the integrating sphere, and the internal reflectivity of the external light source packaging cavity is also different from the internal reflectivity of the integrating sphere. When the slit size is changed, the relative spectral distribution of the light source has a significant trend in the long-wavelength end. When the spectral radiance varies by 4 orders of magnitude, the variation at the long wavelength end may reach 10 orders of magnitude or even greater.

On the other hand, in the case that the spectral radiance of the conventional radiance source can be adjusted within a certain amount, such as 4 orders of magnitude or more, and there is spectral uniformity in the adjustment range, the spectral radiance of different adjustment sections of the conventional radiance source can be obtained relatively easily by using the conventional detector monitoring. The ratio of the adjusted spectral radiance to the pre-adjusted spectral radiance is proportional to the ratio of the adjusted detector acquisition signal to the pre-adjusted detector signal. However, the spectral variations in the light source modulation of the integrating sphere make the method of detector monitoring unsuitable. Therefore, it is difficult for an integrating sphere light source to accurately achieve continuous adjustability of spectral radiance over multiple orders of magnitude.

In addition, under the condition of detection of the spectrometer, optical materials such as a prism or a grating are adopted in the spectrometer to carry out light splitting, and the spectral radiance in the wavelength range of 1-2nm is obtained after light splitting and is measured, so that the signal-to-noise ratio is poor; in the case of silicon detector detection, the signal collected by the silicon detector is a convolution of the full spectrum of the light source and the spectral response of the detector, the wavelength collection range generally covers 300nm to 1100nm, and the spectral radiation signal is more than 1000 times stronger than the signal at a single wavelength of the spectrometer. Therefore, it is difficult for a spectrometer to measure the spectral radiance of a low-light-radiance source compared to a detector.

Because the continuous adjustment of the spectrum radiation brightness is difficult to be realized in a plurality of orders by the micro-light radiation brightness source, and the micro-light radiation brightness of the micro-light radiation brightness source is difficult to be accurately calibrated, the micro-light radiation brightness source with the spectrum radiation brightness capable of being continuously adjusted in a plurality of orders is an important research direction in the scientific field.

In this regard, the present invention provides a source of low-light radiation brightness. The micro-light radiation brightness source provided by the invention can realize more accurate and continuous adjustment of spectrum radiation brightness in multiple orders, can maintain spectrum consistency while realizing continuous adjustment of multi-order spectrum radiation brightness, can realize accurate calibration of spectrum radiation brightness through simpler numerical calculation, has simple structure, lower equipment cost and smaller space for arranging the micro-light radiation brightness source.

Fig. 1 is a schematic structural diagram of a micro-light radiation brightness source provided by the invention. The micro-light radiation brightness source provided by the present invention is described below with reference to fig. 1. As shown in fig. 1, the low-light radiation brightness source 101 includes: an integrating sphere light source 102, a diaphragm 103, a first diffuse reflection plate 104, and a controller 105; the radius of the diaphragm 103 is smaller than the radius of the light outlet of the integrating sphere light source 102;

the integrating sphere light source 102, the diaphragm 103 and the first diffuse reflection plate 104 are arranged along a first light path, the first light path passes through the center of the light outlet plane of the integrating sphere light source 102, the center of the diaphragm 103 and the center of the first diffuse reflection plate 104, and the first light path coincides with the normal line of the light outlet plane of the integrating sphere light source 102, the normal line of the diaphragm 103 plane and the normal line of the first diffuse reflection plate 104;

specifically, the integrating sphere light source 102 in the embodiment of the present invention may provide an optical signal with a wavelength λ.

It can be understood that the light outlet of the integrating sphere light source 102 is the starting point of the first optical path, and the first optical path is the transmission path of the optical signal.

The signal provided by the integrating sphere light source 102 passes through the diaphragm 103 and then irradiates the first diffuse reflection plate 104, and the first diffuse reflection plate 104 is the end point of the first optical path.

After the first diffuse reflection plate 104 reflects the incident light signal, the light signal emitted by the first diffuse reflection plate 104 is the light signal output by the micro-light radiation brightness source 101 in the embodiment of the present invention, and the spectrum radiation brightness of the first diffuse reflection plate 104 is the spectrum radiation brightness of the micro-light radiation brightness source 101.

The distance between the diaphragm 103 and the integrating sphere light source 102 refers to the distance between the center of the diaphragm 103 and the center of the light outlet of the integrating sphere light source 102. The light passing radius of the diaphragm 103 is smaller than the diameter of the light outlet of the integrating sphere light source 102.

The first diffusion reflection plate 104 in the embodiment of the present invention is circular. The distance between the diaphragm 103 and the first diffuse reflection plate 104 refers to a distance between the center of the diaphragm 103 and the center of the first diffuse reflection plate 104, and the distance between the diaphragm 103 and the first diffuse reflection plate 104 may be referred to as a first distance.

Alternatively, the first diffuse reflection plate 104 in the embodiment of the present invention is a diffuse reflection whiteboard.

It should be noted that, the distance between the diaphragm 103 and the integrating sphere light source 102 needs to be greater than a preset distance, so as to prevent the reflected light of the diaphragm 103 toward the light exit plane of the integrating sphere light source 102 from entering the integrating sphere light source 102. The preset distance may be determined according to an actual situation and/or an actual situation, and in the embodiment of the present invention, the preset distance is not specifically limited.

Optionally, the value range of the preset distance may be above 15 cm.

It should be noted that, in the embodiment of the present invention, the first distance is much larger than the diameter of the diaphragm 103. Therefore, based on the geometric light path transmission principle, the diaphragm 103 can be approximated as a point light source.

It will be appreciated that from the principles of geometrical optics, the radiant energy is conserved without loss in the transmission medium. Therefore, in the embodiment of the present invention, the spectral radiance of the light outlet of the integrating sphere light source 102 is equal to the spectral radiance in the diaphragm 103.

The optical radiation Φ (λ) received by the first diffuse reflection plate 104 can be described by formula (1):

where L (λ) represents the spectral radiance of integrating sphere light source 102 at wavelength λ; s is S ₁ Representing the area of the diaphragm 103; s is S ₂ Representing the area of the first diffusion reflection plate 104; d, d ₁ Representing the first distance.

The reception of the radiant illuminance E (λ) by the first diffuse reflection plate 104 at the wavelength λ can be described by formula (2):

the spectral radiance L' (λ) reflected by the first diffuse reflection plate 104 at the wavelength λ can be described by formula (3):

where ρ (λ) represents the reflectance of the first diffuse reflection plate 104 at the wavelength λ.

Since the area of the diaphragm 103 and the first distance are independent of the wavelength λ, the spectral radiance L' (λ) reflected by the first diffuse reflection plate 104 at the wavelength λ is related only to the reflectance ρ (λ) of the first diffuse reflection plate 104 at the wavelength λ.

FIG. 2 is a graph showing the (0, 45) reflectivity of the first diffuse reflection plate from 400nm to 1000nm under the 45 DEG reflection of the incidence of 0 DEG in the spectral radiance calibration device provided by the invention. As shown in fig. 2, the maximum difference in reflectivity of the first diffusion reflection plate 104 at different wavelengths is not more than 0.8%.

As the flatness of the reflectivity of the first diffuse reflection plate 104 can be known, the spectrum of the micro-light radiation brightness source 101 (i.e. the spectrum of the light signal emitted from the first diffuse reflection plate 104) in the embodiment of the invention has a spectrum consistency with the spectrum of the integrating sphere light source 102.

The ratio R of the spectral radiance L' (λ) reflected by the first diffuse reflection plate 104 at the wavelength λ to the spectral radiance L (λ) of the integrating sphere light source 102 at the wavelength λ can be described by formula (4):

as can be seen from the formula (4), the ratio R is equal to the first distance d ₁ And area S of diaphragm 103 ₁ And the reflectance ρ (λ) of the first diffuse reflection plate 104 at the wavelength λ.

Further, the spectral radiance L' (λ) reflected by the first diffuse reflection plate 104 at the wavelength λ is only at the first distance d ₁ And area S of diaphragm 103 ₁ The reflectance ρ (λ) of the first diffuse reflection plate 104 at the wavelength λ and the spectral radiance L (λ) of the integrating sphere light source 102 at the wavelength λ.

For example, since the radius of the light exit of the integrating sphere light source 102 is generally larger than 5cm, when the radius of the diaphragm 103 is 5cm, the first distance d is ₁ For 50cm, R can be calculated based on formula (4) to be approximately 0.01, i.e. the spectral radiance of the surface of the first diffuse reflection plate 104 is reduced to one percent of the spectral radiance of the integrating sphere light source 102; if the first distance d ₁ At 500cm, R can be calculated based on the formula (4) to be approximately 0.0001, i.e., the spectral radiance of the surface of the first diffuse reflection plate 104 is reduced to one ten thousandth of the spectral radiance of the integrating sphere light source 102.

For another example, in the case where the reflectance ρ (λ) of the first diffuse reflection plate 104 at the wavelength λ is changed, the spectral radiance of the surface of the first diffuse reflection plate 104 is changed accordingly.

For another example, the radius of the diaphragm 103 is further reduced, for example, in the case where the radius of the diaphragm 103 is 2.5mm, if the first distance d ₁ 500cm, then baseThe spectrum radiation brightness of the surface of the first diffuse reflection plate 104 can be calculated in the formula (4) to be reduced to four parts per million of the spectrum radiation brightness of the integrating sphere light source 102;

for another example, in the case where the spectral radiance L (λ) of the integrating sphere light source 102 at the wavelength λ is changed, the spectral radiance of the surface of the first diffuse reflection plate 104 is changed accordingly.

It will be appreciated that in the case of laboratory optical platforms having dimensions greater than 5 meters, the first distance d ₁ The range of the value of the radius of the diaphragm 103 can be between 50cm and 500cm, the range of the value of the radius of the diaphragm 103 can be between 2.5mm and 5cm, if the spectral radiance L (λ) of the integrating sphere light source 102 at the wavelength λ and the reflectivity ρ (λ) of the first diffuse reflection plate 104 at the wavelength λ are preset values, the variation amplitude of the spectral radiance of the micro-light radiant light source can still reach 40000 times, namely more than 4 orders of magnitude, and the spectrum of the micro-light radiant light source 101 and the spectrum of the integrating sphere light source 102 have spectrum consistency. The amplitude of the change in the spectral radiance of the micro-optical radiance source 101 may be more than 6 orders of magnitude if compared to the spectral radiance of the integrating sphere light source 102.

It should be noted that, when the radius of the diaphragm 103 is 2.5mm, the error of the area measurement of the diaphragm 103 may be typically several ten thousandths, the error of the distance measurement is typically less than one thousandth, and the error of the reflectivity measurement is also smaller. Thus, by varying the radius of the diaphragm 103, the first distance d ₁ The spectral radiance L (λ) of the integrating sphere light source 102 at the wavelength λ and part or all of the reflectance ρ (λ) of the first diffuse reflection plate 104 can be more accurately continuously adjustable to the spectral radiance L' (λ) of the surface of the first diffuse reflection plate 104.

It should be noted that, in the embodiment of the present invention, based on the formula (4), the spectral radiance L' (λ) reflected by the first diffuse reflection plate 104 at the wavelength λ and the first distance d may be obtained ₁ The radius of the diaphragm 103, the reflectance ρ (λ) of the first diffuse reflection plate 104 at the wavelength λ, and the spectral radiance L (λ) of the integrating sphere light source 102 at the wavelength λ, and determining the above-described mapping relationship as a first target mapping relationship.

Alternatively, the first target mapping relationship may be expressed in the form of a mapping table, a fitting curve, or the like.

The controller 105 is configured to control at least one of the first distance, the spectral radiance of the integrating sphere light source 102, the radius of the diaphragm 103, and the reflectivity of the first diffuse reflection plate 104 based on the target spectral radiance and the first target mapping relationship when the target spectral radiance is acquired, and to calibrate the spectral radiance of the first diffuse reflection plate 104 to the target spectral radiance when the control is completed;

Wherein the first distance refers to a distance between the diaphragm 103 and the first diffuse reflection plate 104; the first target mapping relationship is used to describe a mapping relationship between the spectral radiance of the first diffuse reflection plate 104 and the spectral radiance of the integrating sphere light source 102, the first distance, the reflectivity of the first diffuse reflection plate 104, the radius of the diaphragm 103.

Specifically, the controller 105 may acquire the target spectral radiance in a variety of ways, for example, the controller 105 may acquire the target spectral radiance based on user input; alternatively, the controller 105 may also receive the target spectral radiance sent by other electronic devices. The specific manner in which the controller 105 obtains the target spectral radiance is not limited in the embodiment of the present invention.

The controller 105 may determine a first target distance between the diaphragm 103 and the first diffuse reflection plate 104, a first target spectral radiance of the integrating sphere light source 102, a first target reflectivity of the first diffuse reflection plate 104, and a first target radius of the diaphragm 103 based on the target spectral radiance and the first target mapping relation in a case where the target spectral radiance is acquired.

After the controller 105 obtains the first target distance, the first target spectral radiance, the first target reflectance, and the first target radius, at least one of the first distance, the radius of the diaphragm 103, the reflectance of the first diffuse reflection plate 104, and the spectral radiance of the integrating sphere light source 102 may be controlled so that the first distance reaches the first target distance, the radius of the diaphragm 103 reaches the first target radius, the reflectance of the first diffuse reflection plate 104 reaches the first target reflectance, and the spectral radiance of the integrating sphere light source 102 reaches the first target spectral radiance based on the first target distance, the first target spectral radiance, the first target reflectance, and the first target radius.

It can be understood that, as shown in the formula (4), when the first distance reaches the first target distance, the radius of the diaphragm 103 reaches the first target radius, the reflectivity of the first diffuse reflection plate 104 reaches the first target reflectivity, and the spectral radiance of the integrating sphere light source 102 reaches the first target spectral radiance, the spectral radiance of the surface of the first diffuse reflection plate 104 is the target spectral radiance.

Accordingly, the controller 105 can calibrate the spectral radiance of the surface of the first diffuse reflection plate 104 to the target spectral radiance upon completion of the above-described control.

It will be appreciated that, in the case where the first distance has reached the first target distance, the controller 105 does not need to control the first distance any more, and similarly, in the case where the radius of the diaphragm 103 has reached the first target radius, the controller 105 does not need to control the radius of the diaphragm 103 any more, in the case where the reflectivity of the first diffuse reflection plate 104 has reached the first target reflectivity, the controller 105 does not need to control the reflectivity of the first diffuse reflection plate 104 any more, and in the case where the spectral radiance of the integrating sphere light source 102 has reached the first target spectral radiance, the controller 105 does not need to control the spectral radiance of the integrating sphere light source 102 any more.

Alternatively, the controller 105 in the embodiment of the present invention may control at least one of the first distance, the radius of the diaphragm 103, the reflectivity of the first diffuse reflection plate 104, and the spectral radiance of the integrating sphere light source 102 in various manners, for example, the controller 105 may control the first distance by controlling a mechanical structure; the controller 105 can also control the reflectivity of the first diffuse reflection plate 104 by controlling the mechanical structure to switch the first diffuse reflection plate 104 with different reflectivity; the controller 105 can also switch the diaphragms 103 with different radiuses by controlling the mechanical structure, so as to realize the control of the radius of the diaphragms 103; the controller 105 can also control the spectral radiance of the integrating sphere light source 102 by controlling the mechanical structure to switch the integrating sphere light sources 102 with different spectral radiance.

Optionally, in the case that the integrating sphere light source 102 has the performance of adjustable spectral radiance, the controller 105 may further control the spectral radiance of the integrating sphere light source 102 to reach the first target spectral radiance through a control instruction; in the case where the diaphragm 103 has the radius-adjustable performance, the controller 105 may control the radius of the diaphragm 103 to reach the first target radius by a control command.

Optionally, after the first target distance, the first target spectral radiance, the first target reflectivity, and the first target radius are obtained, the controller 105 in the embodiment of the present invention may further send the first target distance, the first target spectral radiance, the first target reflectivity, and the first target radius to a display device, so that the display device displays the first target distance, the first target spectral radiance, the first target reflectivity, and the first target radius, and after a technician looks at the first target distance, the first target spectral radiance, the first target reflectivity, and the first target radius, the technician may manually set the integrating sphere light source 102 with the spectral radiance being the first target spectral radiance, the diaphragm 103 with the radius being the first target radius, and the first diffuse reflectivity 104 with the radius being the first target reflectivity based on the first target spectral radiance, the first target reflectivity, and the first target radius.

In the embodiment of the present invention, the specific manner of controlling at least one of the first distance, the radius of the diaphragm 103, the reflectivity of the first diffuse reflection plate 104, and the spectral radiance of the integrating sphere light source 102 by the controller 105 is not limited.

It should be noted that, the spectral radiance of the integrating sphere light source 102 may be changed in various ways, for example: the spectral radiance of integrating sphere light source 102 may be varied by varying the size of the integrating sphere in integrating sphere light source 102 and by adjusting the power of the light sources in integrating sphere light source 102.

After the controller 105 calibrates the spectral radiance of the surface of the first diffuse reflection plate 104 to the target spectral radiance, the first diffuse reflection plate 104 may be used as a detection target to control the micro light measurement device to measure the spectral radiance of the first diffuse reflection plate 104, and then the micro light measurement device may be calibrated based on the measurement result of the micro light measurement device.

According to the low-light-level radiation brightness source, the spectral radiation brightness in multiple orders can be more accurately and continuously adjusted only by controlling at least one of the first distance between the diaphragm and the first diffuse reflection plate, the radius of the diaphragm, the reflectivity of the first diffuse reflection plate and the spectral radiation brightness of the integrating sphere light source, the low-light-level radiation brightness source can be continuously adjusted in multiple orders and can maintain spectral consistency, calibration devices such as a detector are not needed, the spectral radiation brightness of the low-light-level radiation brightness source can be calibrated more accurately, the low-light-level radiation brightness source is simple in structure, the cost of equipment required to be input is lower, and the space required for arranging the low-light-level radiation brightness source is smaller.

As an alternative embodiment, the spectral radiance of the integrating sphere light source 102 is a preset spectral radiance;

the controller 105 is further configured to, in a case where the target spectral radiance is obtained, control at least one of the first distance, the radius of the diaphragm 103, and the reflectivity of the first diffuse reflection plate 104 based on a preset spectral radiance, the target spectral radiance, and a first target mapping relationship, and after the control is completed, calibrate the spectral radiance of the first diffuse reflection plate 104 to the target spectral radiance.

It can be understood that, since the integrating sphere light source 102 is a precise optical instrument, and the process of changing the spectral radiance of the integrating sphere light source 102 by changing the size of the integrating sphere in the integrating sphere light source 102, adjusting the power of the light source in the integrating sphere light source 102, and the like is complicated, the spectral radiance of the integrating sphere light source 102 in the embodiment of the present invention is a preset spectral radiance, and the controller 105 does not need to control the spectral radiance of the integrating sphere light source 102 after obtaining the target spectral radiance.

It should be noted that, in the embodiment of the present invention, the preset spectral radiance may be determined based on a priori knowledge and/or actual conditions. The preset spectral radiance is not particularly limited in the embodiment of the present invention.

Specifically, in the case where the target spectral radiance is acquired, the controller 105 may determine the second target distance between the diaphragm 103 and the first diffuse reflection plate 104, the second target reflectivity of the first diffuse reflection plate 104, and the second target radius of the diaphragm 103 based on the target spectral radiance, the preset spectral radiance, and the target radiance.

After the controller 105 obtains the second target distance, the second target reflectance, and the second target radius, it may control at least one of the first distance, the radius of the diaphragm 103, and the reflectance of the first diffuse reflection plate 104 such that the first distance reaches the second target distance, the radius of the diaphragm 103 reaches the second target radius, and the reflectance of the first diffuse reflection plate 104 reaches the second target reflectance, based on the second target distance, the second target reflectance, and the second target radius.

It can be understood that, as shown in the formula (4), when the first distance reaches the second target distance, the radius of the diaphragm 103 reaches the second target radius, the reflectivity of the first diffuse reflection plate 104 reaches the second target reflectivity, and the spectral radiance of the integrating sphere light source 102 is the preset spectral radiance, the spectral radiance of the surface of the first diffuse reflection plate 104 is the target spectral radiance.

In the embodiment of the invention, when the spectrum radiation brightness of the integrating sphere light source 102 is the preset spectrum radiation brightness, the spectrum radiation brightness in multiple orders can be more accurately and continuously adjusted by controlling at least one of the first distance between the diaphragm 103 and the first diffuse reflection plate 104, the radius of the diaphragm 103 and the reflectivity of the first diffuse reflection plate 104, and the structure of the spectrum radiation brightness source 101 can be simplified.

As an alternative, the spectral radiance calibration device further includes: the first slide rail and the first fixing device; the first fixture is connected to the controller 105;

the first fixing device is used for fixing the diaphragm 103 and driving the diaphragm 103 to slide on the first slide rail in response to the control of the controller 105.

Specifically, after the controller 105 obtains the first target distance, if the controller 105 determines that the first distance is not the first target distance, the controller 105 may control the first fixing device to drive the diaphragm 103 to slide on the first sliding rail through a control instruction, so that the first distance reaches the first target distance.

After the controller 105 obtains the second target distance, if the controller 105 determines that the first distance is not the second target distance, the controller 105 may control the first fixing device to drive the diaphragm 103 to slide on the first sliding rail through a control instruction, so that the first distance reaches the second target distance.

The low-light-level radiation brightness source in the embodiment of the invention further comprises a first sliding rail and a first fixing device, and the first distance between the diaphragm and the first diffuse reflection plate can be controlled more simply, more efficiently and more accurately based on the first sliding rail and the first fixing device.

As an alternative embodiment, the number of diaphragms 103 is plural, and the radii of any two diaphragms 103 are different; the first fixing device comprises a first switching mechanism;

the first switching mechanism is used for fixing each diaphragm 103, and switching the diaphragms 103 with different radii to the point that the normal line of the diaphragm 103 plane coincides with the first optical path and the first optical path passes through the center point of the diaphragm 103 in response to the control of the controller 105.

Specifically, after the controller 105 obtains the first target radius, the controller 105 may determine, as the first target diaphragm 103, a diaphragm 103 having a radius equal to the first target radius in each diaphragm 103, and further may control, by using a control instruction, the first switching mechanism to switch the first target diaphragm 103 to a state where a normal line of a plane of the first target diaphragm 103 coincides with the first optical path and the first optical path passes through a center point of the first target diaphragm 103, so as to implement control of the radius of the diaphragm 103 by the controller 105.

After the controller 105 obtains the second target radius, the controller 105 may determine, as the second target diaphragm 103, a diaphragm 103 having a radius equal to the second target radius in each diaphragm 103, and further may control the first switching mechanism to switch the second target diaphragm 103 to a position where a normal line of a plane of the second target diaphragm 103 coincides with the first optical path and the first optical path passes through a center point of the second target diaphragm 103 through a control instruction, so as to implement control of the radius of the diaphragm 103 by the controller 105.

Optionally, the first switching mechanism in the embodiment of the present invention may include a belt conveying structure, and gratings with different radii may be linearly arranged along a belt conveying direction, and based on the belt conveying structure, linear switching of gratings with different radii may be implemented;

the first switching mechanism in the embodiment of the invention can also comprise a rotatable gear structure, gratings with different radiuses can be circumferentially arranged along the rotatable gear structure, and the grating rotation switching with different radiuses can be realized based on the rotatable gear structure;

the specific configuration of the first switching mechanism in the embodiment of the present invention is not limited.

The first fixing device in the embodiment of the invention further comprises a first switching mechanism, so that diaphragms with different radiuses can be switched more simply, more efficiently and more accurately based on the first switching mechanism, and the radius of the diaphragm can be controlled more accurately and more efficiently.

As an alternative embodiment, the number of the first diffusion reflection plates 104 is plural, and the reflectivities of any two first diffusion reflection plates 104 are different; the low-light radiation brightness source 101 further comprises: a second switching mechanism;

the second switching mechanism is configured to fix each first diffuse reflection plate 104, and switch the first diffuse reflection plate 104 with different reflectivity to a point where a normal line of a plane where the first diffuse reflection plate 104 is located coincides with the first optical path and the first optical path passes through a center point of the first diffuse reflection plate 104 in response to control of the controller 105.

Specifically, after the controller 105 obtains the first target reflectivity, the controller 105 may determine, as the first target first diffuse reflection plate 104, the first diffuse reflection plate 104 having the reflectivity of the first target reflectivity in the first diffuse reflection plates 104, and further may control the second switching mechanism to switch the first target first diffuse reflection plate 104 to a point where the normal line of the first target first diffuse reflection plate 104 coincides with the first optical path and the first optical path passes through the center point of the first target first diffuse reflection plate 104 through the control instruction, so as to implement the control of the reflectivity of the first diffuse reflection plate 104 by the controller 105.

After the controller 105 obtains the second target reflectivity, the controller 105 may determine, as the second target first diffuse reflection plate 104, the first diffuse reflection plate 104 having the reflectivity of the second target reflectivity in the first diffuse reflection plates 104, and further may control the second switching mechanism to switch the second target first diffuse reflection plate 104 to a point where the normal line of the second target first diffuse reflection plate 104 coincides with the first optical path and the first optical path passes through the center point of the second target first diffuse reflection plate 104 through a control instruction, so as to implement control of the reflectivity of the first diffuse reflection plate 104 by the controller 105.

Alternatively, the second switching mechanism in the embodiment of the present invention may include a belt conveying structure, where the first diffuse reflection plates 104 with different reflectivities may be linearly arranged along the belt conveying direction, and based on the belt conveying structure, the first diffuse reflection plates 104 with different reflectivities may be linearly switched;

the second switching mechanism in the embodiment of the present invention may further include a rotatable gear structure, the first diffuse reflection plates 104 with different reflectivities may be arranged along the circumference of the rotatable gear structure, and rotation switching of the first diffuse reflection plates 104 with different reflectivities may be implemented based on the rotatable gear structure;

the specific configuration of the second switching mechanism in the embodiment of the present invention is not limited.

The low-light-level radiation brightness source in the embodiment of the invention further comprises a second switching mechanism, so that the first diffuse reflection plates with different reflectivities can be switched more simply, more efficiently and more accurately based on the second switching mechanism, and the reflectivities of the first diffuse reflection plates can be controlled more accurately and more efficiently.

As an alternative embodiment, the reflectivity of the first diffuse reflection plate 104 is a preset reflectivity;

the controller 105 is further configured to control the first distance and/or the radius of the diaphragm 103 based on the preset spectral radiance, the target spectral radiance, the preset reflectivity, and the first target mapping relationship, and after the control is completed, calibrate the spectral radiance of the first diffuse reflection plate 104 to the target spectral radiance.

It should be noted that the preset reflectivity in the embodiments of the present invention may be determined based on a priori knowledge and/or actual conditions. The preset reflectivity is not particularly limited in the embodiment of the present invention.

Specifically, in the case where the target spectral radiance is acquired, the controller 105 may determine the third target distance between the diaphragm 103 and the first diffuse reflection plate 104 and the second target radius of the diaphragm 103 based on the target spectral radiance, the preset reflectivity, and the target radiance relationship.

After the controller 105 obtains the third target distance and the third target radius, the controller may control the first distance and/or the radius of the diaphragm 103 based on the third target distance and the third target radius so that the first distance reaches the third target distance and the radius of the diaphragm 103 reaches the third target radius.

It can be understood that, as shown in the formula (4), when the first distance reaches the third target distance, the radius of the diaphragm 103 reaches the third target radius, the reflectivity of the first diffuse reflection plate 104 is a preset reflectivity, and the spectral radiance of the integrating sphere light source 102 is a preset spectral radiance, the spectral radiance of the surface of the first diffuse reflection plate 104 is the target spectral radiance.

According to the low-light-level radiation brightness source provided by the embodiment of the invention, under the condition that the spectrum radiation brightness of the integrating sphere light source is the preset spectrum radiation brightness and the reflectivity of the first diffuse reflection plate is the preset reflectivity, the spectrum radiation brightness in multiple orders can be more accurately and continuously adjusted only by controlling the first distance between the diaphragm and the first diffuse reflection plate and/or the radius of the diaphragm, and the structure of the low-light-level radiation brightness source can be further simplified.

Based on the content of the above embodiments, further comprising: a hermetic case 106;

the integrating sphere light source 102, the diaphragm 103 and the first diffuse reflection plate 104 are all disposed in a closed housing.

In the embodiment of the invention, the integrating sphere light source, the diaphragm and the first diffuse reflection plate 104 are all arranged in the closed shell, so that interference of other light signals on the low-light-level radiation brightness source can be avoided.

Based on the above-described embodiments, the micro-light radiation brightness source 101 further includes: a second diffusion reflection plate 301;

the first diffuse reflection plate 104 and the second diffuse reflection plate 301 are arranged along a second optical path, the first optical path and the second optical path intersect at a center point of the first diffuse reflection plate 104, and the second optical path passes through a center point of the second diffuse reflection plate 301; wherein the second distance refers to a distance between a center point of the second diffuse reflection plate 301 and a center point of the first diffuse reflection plate 104;

FIG. 3 is a schematic diagram of a micro-light radiation brightness source according to the second embodiment of the present invention. As shown in fig. 3, after the first diffuse reflection plate 104 reflects the incident light signal, the light signal emitted from the first diffuse reflection plate 104 irradiates the second diffuse reflection plate 301.

It can be understood that the center point of the first diffusion reflection plate 104 is the start point of the second optical path, and the center point of the second diffusion reflection plate 301 is the end point of the second optical path.

After the second diffuse reflection plate 301 reflects the incident light signal, the light signal emitted by the second diffuse reflection plate 301 is the light signal output by the micro-light radiation brightness source 101 in the embodiment of the present invention, and the spectrum radiation brightness of the second diffuse reflection plate 301 is the spectrum radiation brightness of the micro-light radiation brightness source 101. The spectral radiance of the second diffuse reflection plate 301 is further reduced compared to the spectral radiance of the first diffuse reflection plate 104 via the reflection of the first diffuse reflection plate 104 and the second diffuse reflection plate 301.

The second distance between the center point of the second diffuse reflection plate 301 and the center point of the first diffuse reflection plate 104 is far greater than the radius of the first diffuse reflection plate 104.

Alternatively, the second distance may have a value in the range of 50cm to 400 cm.

Alternatively, the second diffusion reflection plate 301 may be disposed parallel to the first diffusion reflection plate 104.

Note that the second diffuse reflection plate 301 and the first diffuse reflection plate 104 may be the same type of diffuse reflection plate.

The light radiation Φ' (λ) received by the second diffuse reflection plate 301 can be described by formula (5):

wherein S is ₃ An area of the second diffusion reflection plate 301; θ ₁ Representing the angle between the normal of the first diffuse reflection plate 104 and the second optical path; θ ₂ An angle between the normal line of the second diffuse reflection plate 301 and the second optical path is shown; d, d ₂ Representing the second distance.

The spectral radiance L "(λ) reflected by the second diffuse reflection plate 301 at the wavelength λ can be described by formula (6):

where ρ' (λ) represents the reflectance of the second diffuse reflection plate 301 at the wavelength λ.

The ratio R of the spectral radiance L "(λ) reflected by the second diffuse reflection plate 301 at the wavelength λ to the spectral radiance L (λ) of the integrating sphere light source 102 at the wavelength λ can be described by formula (6):

from equation (7), the ratio R' is equal to the first distance d ₁ Second distance d ₂ Area S of diaphragm 103 ₁ Area S of the first diffuse reflection plate 104 ₂ The reflectance ρ (λ) of the first diffuse reflection plate 104 at the wavelength λ, the reflectance ρ' (λ) of the second diffuse reflection plate 301 at the wavelength λ, the angle θ of the normal line of the first diffuse reflection plate 104 and the second optical path ₁ And an angle θ between the normal line of the second diffuse reflection plate 301 and the second optical path ₂ And (5) correlation.

Further, the second diffuse reflection plate 301 reflects the spectral radiant brightness L' (lambda) at the wavelength lambda, at a first distance d ₁ Second distance d ₂ Area S of diaphragm 103 ₁ Area S of the first diffuse reflection plate 104 ₂ The reflectance ρ (λ) of the first diffuse reflection plate 104 at the wavelength λ, the reflectance ρ' (λ) of the second diffuse reflection plate 301 at the wavelength λ, the angle θ of the normal line of the first diffuse reflection plate 104 and the second optical path ₁ And an angle θ between the normal line of the second diffuse reflection plate 301 and the second optical path ₂ And (5) correlation.

For example, the radius of the first diffuse reflection plate 104 is 5cm, the second distance d ₂ In the case of 500cm, the spectral radiant luminance L "(λ) of the second diffuse reflection plate 301 is further reduced by 10000 times or more than the spectral radiant luminance L' (λ) of the first diffuse reflection plate 104.

Thus, by varying the radius of the diaphragm 103, the first distance d ₁ Second distance d ₂ First diffuse reflection plate104, the reflectivity ρ (λ) of the second diffuse reflection plate 301 at the wavelength λ, the spectral radiance L (λ) of the integrating sphere light source 102 at the wavelength λ, the angle θ of the normal line of the first diffuse reflection plate 104 and the second optical path ₁ And an angle θ between the normal line of the second diffuse reflection plate 301 and the second optical path ₂ The continuous adjustment of the spectral radiant brightness L "(λ) of the second diffuse reflection plate 301 can be more accurately achieved.

It should be noted that, in the embodiment of the present invention, based on the formula (7), the spectral radiance L "(λ) reflected by the second diffuse reflection plate 301 at the wavelength λ and the first distance d may be obtained ₁ Second distance d ₂ Radius of diaphragm 103, area S of first diffuse reflection plate 104 ₂ The reflectance ρ (λ) of the first diffuse reflection plate 104 at the wavelength λ, the reflectance ρ' (λ) of the second diffuse reflection plate 301 at the wavelength λ, the angle θ of the normal line of the first diffuse reflection plate 104 and the second optical path ₁ And an angle θ between the normal line of the second diffuse reflection plate 301 and the second optical path ₂ And determining the mapping relation as a second target mapping relation.

Alternatively, the second target mapping relationship may be expressed in the form of a mapping table, a fitting curve, or the like.

The controller 105 is further configured to, when the target spectral radiance is obtained, control at least one of the first distance, the second distance, the radius of the diaphragm, the reflectivity of the first diffuse reflection plate 104, the spectral radiance of the integrating sphere light source, the reflectivity of the second diffuse reflection plate 301, the area of the first diffuse reflection plate 104, the angle between the normal line of the first diffuse reflection plate 104 and the second optical path, and the angle between the normal line of the second diffuse reflection plate 301 and the second optical path based on the target spectral radiance and a second target mapping relation, and after the control is completed, calibrate the spectral radiance of the second diffuse reflection plate 301 to the target spectral radiance;

The second target mapping relationship is used for describing a mapping relationship between the spectral radiance of the second diffuse reflection plate 301, the first distance, the second distance, the radius of the diaphragm, the reflectivity of the first diffuse reflection plate 104, the spectral radiance of the integrating sphere light source, the reflectivity of the second diffuse reflection plate 301, the area of the first diffuse reflection plate 104, the included angle between the normal line of the first diffuse reflection plate 104 and the second light path, and the included angle between the normal line of the second diffuse reflection plate 301 and the second light path.

Specifically, when the controller 105 obtains the target spectral radiance, the third target distance between the diaphragm 103 and the first diffuse reflection plate 104, the fourth target distance between the first diffuse reflection plate 104 and the second diffuse reflection plate 301, the third target spectral radiance of the integrating sphere light source 102, the third target reflectivity of the first diffuse reflection plate 104, the third target radius of the diaphragm 103, the fourth target reflectivity of the second diffuse reflection plate 301, the first target area of the first diffuse reflection plate 104, the first target angle between the normal line of the first diffuse reflection plate 104 and the second optical path, and the second target angle between the normal line of the second diffuse reflection plate 301 and the second optical path may be determined based on the target spectral radiance and the second target mapping relation.

After the controller 105 obtains the third target distance, the fourth target distance, the third target spectral radiance, the third target reflectivity, the third target radius, the fourth target reflectivity, the first target area, the first target included angle, and the second target included angle, the controller may control the first distance, the second distance, the radius of the diaphragm, the reflectivity of the first diffuse reflection plate 104, the spectral radiance of the integrating sphere light source, the reflectivity of the second diffuse reflection plate 301, the area of the first diffuse reflection plate 104, the angle between the normal line of the first diffuse reflection plate 104 and the second light path, and the angle between the normal line of the second diffuse reflection plate 301 and the second light path based on at least one of the third target distance, the fourth target distance, the third target spectral radiance, the third target reflectivity, the third target radius, the fourth target reflectivity, the first target area, the first target included angle, and the second target included angle, so that the first distance reaches the third target distance 103, the reflectivity of the diaphragm, the reflectivity of the first diffuse reflection plate 104, the spectral radiance of the integrating sphere light source reaches the third target spectral radiance of the first diffuse reflection plate 102, the first diffuse reflection plate 104, and the third target radiance of the integrating sphere light source

The first distance reaches the third target distance, the second distance reaches the fourth target distance, the spectral radiance of the integrating sphere light source 102 reaches the third target spectral radiance, the reflectivity of the first diffuse reflection plate 104 reaches the third target reflectivity, the radius of the diaphragm 103 reaches the third target radius, the reflectivity of the second diffuse reflection plate 301 reaches the fourth target reflectivity, the area of the first diffuse reflection plate 104 reaches the first target area, the angle between the normal line of the first diffuse reflection plate 104 and the second optical path reaches the first target angle, and the angle between the normal line of the second diffuse reflection plate 301 and the second optical path reaches the second target angle.

As can be understood, as shown in the formula (7), when the first distance reaches the third target distance, the second distance reaches the fourth target distance, the spectral radiance of the integrating sphere light source 102 reaches the third target spectral radiance, the reflectivity of the first diffuse reflection plate 104 reaches the third target reflectivity, the radius of the diaphragm 103 reaches the third target radius, the reflectivity of the second diffuse reflection plate 301 reaches the fourth target reflectivity, the area of the first diffuse reflection plate 104 reaches the first target area, the angle between the normal line of the first diffuse reflection plate 104 and the second optical path reaches the first target angle, and the angle between the normal line of the second diffuse reflection plate 301 and the second optical path reaches the second target angle, the spectral radiance of the second diffuse reflection plate 301 is the target spectral radiance.

Accordingly, the controller 105 can calibrate the spectral radiance of the second diffuse reflection plate 301 to the target spectral radiance upon completion of the above-described control.

In the embodiment of the present invention, the pair controller 105 is configured to control the first distance,

The specific manner of controlling at least one of the second distance, the radius of the diaphragm, the reflectivity of the first diffuse reflection plate 104, the spectral radiance of the integrating sphere light source, the reflectivity of the second diffuse reflection plate 301, the area of the first diffuse reflection plate 104, the angle between the normal line of the first diffuse reflection plate 104 and the second optical path, and the angle between the normal line of the second diffuse reflection plate 301 and the second optical path is not limited.

The low-light-level radiation brightness source in the embodiment of the invention further comprises the second diffuse reflection plate, so that the spectrum radiation brightness of the low-light-level radiation brightness source can be further reduced, the spectrum consistency can be maintained, the low-light-level radiation brightness source is simple in structure, the required equipment cost is lower, and the space required for arranging the low-light-level radiation brightness source is smaller.

As an alternative embodiment, the micro-light radiation brightness source 101 further comprises: the second slide rail and the second fixing device; the second fixing device is connected with the controller;

the second fixing device is configured to fix the second diffuse reflection plate 301, and drive the second diffuse reflection plate 301 to slide on the second slide rail in response to control of the controller.

Specifically, after the controller 105 obtains the fourth target distance, if the controller 105 determines that the second distance is not the fourth target distance, the controller 105 may control the second fixing device to drive the diaphragm 103 to slide on the second sliding rail through a control instruction, so that the second distance reaches the fourth target distance.

As an alternative embodiment, the number of the second diffusion reflection plates 301 is plural, and the reflectivities of any two second diffusion reflection plates 301 are different; the second fixing device comprises a third switching mechanism;

the third switching mechanism is for fixing each of the second diffuse reflection plates 301, and switching the second diffuse reflection plates 301 of different reflectivities to the second optical path through the center of the second diffuse reflection plate 301 in response to control of the controller.

Fig. 4 is a schematic flow chart of the method for generating micro light according to the present invention. The method for calibrating the spectrum radiation brightness is realized based on the micro-light radiation brightness source 101. The micro light generation method of the present invention is described below with reference to fig. 4. As shown in fig. 4, the method includes: step 401, obtaining target spectrum radiation brightness;

Step 402 of controlling at least one of the first distance, the spectral radiance of the integrating sphere light source 102, the radius of the diaphragm 103, and the reflectivity of the first diffuse reflection plate 104;

step 403, calibrating the spectrum radiation brightness of the first diffuse reflection plate 104 to be the target spectrum radiation brightness;

It should be noted that, in the embodiment of the present invention, the execution body is the controller 105.

It should be noted that, the glimmer generating method provided by the invention can more accurately generate glimmer with continuously adjustable spectral radiance in multiple orders of magnitude. The specific execution steps of the micro light generation method provided by the invention can be referred to the content of each embodiment, and the embodiments of the invention are not repeated.

According to the embodiment of the invention, the glimmer with continuously adjustable spectral radiance in a plurality of orders can be generated more accurately by controlling at least one of the first distance between the diaphragm and the first diffuse reflection plate 104, the radius of the diaphragm, the reflectivity of the first diffuse reflection plate 104 and the spectral radiance of the integrating sphere light source, the glimmer with continuously adjustable spectral radiance in a plurality of orders can be generated, the spectral consistency can be maintained while the glimmer with continuously adjustable spectral radiance in a plurality of orders is generated, and the generated glimmer spectral radiance can be calibrated more accurately without calibration devices such as detectors.

Fig. 5 illustrates a physical schematic diagram of an electronic device, as shown in fig. 5, which may include: processor 510, communication interface (Communications Interface) 520, memory 530, and communication bus 540, wherein processor 510, communication interface 520, memory 530 complete communication with each other through communication bus 540. The processor 510 may invoke logic instructions in the memory 530 to perform a dim light generation method, the method comprising: acquiring target spectrum radiation brightness; controlling at least one of a first distance, a spectral radiance of the integrating sphere light source, a radius of the diaphragm, and a reflectivity of the first diffuse reflection plate 104; calibrating the spectrum radiation brightness of the first diffuse reflection plate 104 to be the target spectrum radiation brightness; wherein the first distance refers to a distance between the diaphragm and the first diffuse reflection plate 104; the first target mapping relationship is used to describe a mapping relationship between the spectral radiance of the first diffuse reflection plate 104 and the spectral radiance of the first distance, the reflectivity of the first diffuse reflection plate 104, the radius of the diaphragm, and the integrating sphere light source.

Further, the logic instructions in the memory 530 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

In another aspect, the present invention also provides a computer program product comprising a computer program, the computer program being storable on a non-transitory computer readable storage medium, the computer program, when executed by a processor, being capable of performing the method of generating a low light level provided by the methods described above, the method comprising: acquiring target spectrum radiation brightness; controlling at least one of a first distance, a spectral radiance of the integrating sphere light source, a radius of the diaphragm, and a reflectivity of the first diffuse reflection plate 104; calibrating the spectrum radiation brightness of the first diffuse reflection plate 104 to be the target spectrum radiation brightness; wherein the first distance refers to a distance between the diaphragm and the first diffuse reflection plate 104; the first target mapping relationship is used to describe a mapping relationship between the spectral radiance of the first diffuse reflection plate 104 and the spectral radiance of the first distance, the reflectivity of the first diffuse reflection plate 104, the radius of the diaphragm, and the integrating sphere light source.

In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the method of generating a low light level provided by the above methods, the method comprising: acquiring target spectrum radiation brightness; controlling at least one of a first distance, a spectral radiance of the integrating sphere light source, a radius of the diaphragm, and a reflectivity of the first diffuse reflection plate 104; calibrating the spectrum radiation brightness of the first diffuse reflection plate 104 to be the target spectrum radiation brightness; wherein the first distance refers to a distance between the diaphragm and the first diffuse reflection plate 104; the first target mapping relationship is used to describe a mapping relationship between the spectral radiance of the first diffuse reflection plate 104 and the spectral radiance of the first distance, the reflectivity of the first diffuse reflection plate 104, the radius of the diaphragm, and the integrating sphere light source.

The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A micro-optic radiation brightness source, comprising: the device comprises an integrating sphere light source, a diaphragm, a first diffuse reflection plate and a controller; the radius of the diaphragm is smaller than that of the diaphragm radius of light outlet of integrating sphere light source;

2. The micro-optic radiance source of claim 1, further comprising: the first slide rail and the first fixing device; the first fixing device is connected with the controller;

3. The micro-light radiation brightness source according to claim 2, wherein the number of the diaphragms is plural, and the radius of any two diaphragms is different; the first fixing device comprises a first switching mechanism;

4. The low-light-level radiation brightness source according to claim 1, wherein the number of the first diffuse reflection plates is plural, and the reflectivities of any two first diffuse reflection plates are different; the micro-light radiation brightness source further comprises: a second switching mechanism;

5. The micro-light radiant brightness source of claim 1, wherein the spectral radiant brightness of the integrating sphere light source is a preset spectral radiant brightness;

6. The low-light level radiation brightness source according to claim 5, wherein the reflectivity of the first diffuse reflection plate is a preset reflectivity;

7. The micro-optic radiance source of claim 1, further comprising: a closed housing;

8. The micro-optical radiation intensity source according to any one of claims 1 to 7, further comprising: a second diffuse reflection plate;

9. The micro-optic radiance source of claim 8, further comprising: the second slide rail and the second fixing device; the second fixing device is connected with the controller;

10. A method of generating a low-light level, based on a low-light level radiance source according to any one of claims 1 to 9, comprising:

acquiring target spectrum radiation brightness;