CN114383814A - Lens wide-spectrum transmittance measuring device and method - Google Patents
Lens wide-spectrum transmittance measuring device and method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0207—Details of measuring devices
Abstract
The invention relates to a lens wide spectrum transmittance measuring device and a method, wherein the measuring device comprises: the device comprises a light source circuit, an integrating sphere and an energy detection assembly; the lens to be detected is placed between the light source light path and the integrating sphere, and the integrating sphere is connected with the energy detection assembly through an optical fiber; the light source light path emits light with different wave bands, and the light enters the energy detection assembly after being collected by the integrating sphere; the energy detection assembly respectively measures the energy values of incident light when the lens to be detected is not placed in the energy detection assembly and when the lens to be detected is placed in the energy detection assembly, and the transmittance of the lens to be detected is obtained by comparing the two measured values; aiming at the change of the light beam form (from collimated light to convergent light) after the test light beam passes through the lens to be tested, the invention utilizes the characteristic that the integrating sphere has no high collimation requirement on the light beam form entering the integrating sphere to test the transmittance of the lens by arranging the integrating sphere between the lens to be tested and the energy detection assembly, and can quickly and accurately test the transmittances of the lenses with different focal lengths in the wide spectral ranges of ultraviolet, visible and near infrared bands.
Description
Technical Field
The invention relates to the technical field of optical measurement, in particular to a device and a method for measuring the wide-spectrum transmittance of a lens.
Background
The lens is generally an optical system obtained by combining two or more spherical/aspherical lenses by gluing/air gap/optical cement methods and the like and combining the two or more spherical/aspherical lenses into a mechanical part, and plays a great role in various industries such as industrial production, scientific research and the like. The transmittance of the lens refers to the ratio of light energy passing through the lens to light energy passing through the lens, is an important optical index in the production and use processes of the lens, and is related to a plurality of factors such as the material, the combination mode, the ambient temperature, the working wavelength of the lens and the like. Whether the transmittance of the lens under different wave bands can be tested and whether the test result is accurate directly influences the performance evaluation of the whole optical system, most of traditional transmittance test objects are plane products, the products cannot cause the collimation or convergence of measuring beams, but due to the particularity of the properties of the lens, the collimated beams can be converged or the converged beams can be collimated, and therefore the transmittance test method of the plane products cannot be directly utilized. The existing lens transmittance testing methods mostly adopt a single-wavelength light source for testing, and because the wave band is single, the transmittance under a specific wavelength can only be obtained in each measurement, which is contrary to the requirement of people on the lens transmittance value in a wide spectral range. With the increasing urgent need of people for the signal-to-noise ratio and the wide-spectrum measurement of the system in industrial production, scientific research, polarization measurement and ellipsometry, the traditional lens transmittance testing method and device cannot meet the measurement need of people, so that the measurement spectrum range of the lens needs to be widened and the signal-to-noise ratio and the accuracy of the testing system need to be improved.
In order to detect the lens transmittance in a wide spectral range, a great deal of experiments and attempts have been made to derive some testing devices and methods, which, although capable of performing more accurate tests on the transmittance of some lenses, still have the following problems: (1) some prior arts are usually only used for testing a band range of a narrow band, such as a visible light band range and a near infrared band range, and are difficult to be applied to ultraviolet and deep ultraviolet band ranges, for example, patent CN201720455026 provides a measuring device for testing a band range within 400 plus 800nm, the method can more accurately obtain a transmittance curve of a lens at the testing band, but because the device adopts a grating monochromator which is rotated to set the emergent light range of a bromine tungsten lamp light source to a certain wavelength within 400 plus 800 microns in sequence, and then the wavelength-by-wavelength scanning is carried out, the testing speed is slower, and the testing range is less than the ultraviolet band and the deep ultraviolet band; (2) some lens transmittance measuring methods can only be used for measuring the transmittance of specific lens products, for example, patent CN201910350038 mentions a laser gun lens transmittance measuring device and method, which can perform transmittance measurement on any marking point on the surface of a light beam marking area after a laser gun is cleaned, and present the result in a surface form, but the device and method for measuring the lens transmittance are severely limited in application range due to the selection of a matrix light source, the composition of an optical system and the processing method of test data in the patent, and cannot be generally used for measuring the lens transmittance in industry and scientific research; (3) some foreign devices such as a spectrophotometer can be used for detecting the lens transmittance in a wide spectral range, but the devices are expensive, have complex structures and have higher requirements on the skills of testers.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a device and a method for measuring the wide-spectrum transmittance of a lens, aiming at the problem that the light beam form changes (collimated light changes into convergent light) after a test light beam passes through the lens to be tested, the invention utilizes the characteristic that an integrating sphere has no high collimation requirement on the light beam form entering the integrating sphere, and the integrating sphere is arranged between the lens to be tested and an energy detection assembly to test the transmittance of the lens, so that the transmittances of the lens with different focal lengths in the wide-spectrum ranges of ultraviolet, visible and near infrared bands can be quickly and accurately measured, a simple, quick and accurate measuring device and method are provided for the production and detection of the lens, the device and method are used for product processing and detection, and the controllability of a test system is improved. The method can be applied to the fields of lens/lens processing, manufacturing, optical imaging, precision measurement, scientific research and the like.
According to a first aspect of the present invention, there is provided a lens wide spectrum transmittance measuring apparatus and method, comprising: the device comprises a light source circuit, an integrating sphere and an energy detection assembly; the lens to be measured is placed between the light source light path and the integrating sphere, and the integrating sphere is connected with the energy detection assembly through an optical fiber;
the light source light path emits light with different wave bands, and the light enters the energy detection assembly after being collected by the integrating sphere;
the energy detection assembly respectively measures the energy values of incident light when the lens to be detected is not placed in the lens to be detected and the energy values of incident light when the lens to be detected is placed in the lens to be detected, and the transmittance of the lens to be detected is obtained by comparing the two measured values.
On the basis of the technical scheme, the invention can be improved as follows.
Optionally, the light source optical path includes a light source, and the light source is a deuterium-halogen composite light source;
when the deuterium and halogen composite light source uses a halogen tungsten lamp light source, the measuring device is used for measuring the transmittance of a visible-near infrared band;
when the deuterium-halogen composite light source is a deuterium lamp light source, the measuring device is used for measuring the ultraviolet-visible wave band transmittance.
Optionally, the light source optical path further includes a collimating lens, a diaphragm and a converging lens sequentially arranged in the light source emergent light direction; the light source and the collimating lens are connected through an optical fiber.
Optionally, the convergent lens is an achromatic lens, and an achromatic waveband of the convergent lens covers a transmittance detection range of the lens to be detected;
emergent light of the light source passes through the optical fiber and the converging lens to obtain collimated parallel light in a wide spectral range, and the diaphragm reduces the light spot to the required size.
Optionally, the collimating lens is an achromatic lens, and an achromatic band of the collimating lens is consistent with a transmittance detection range of the lens to be detected.
Optionally, the diaphragm is an iris diaphragm, and the diaphragm is manually adjusted according to the size of the light-transmitting area of the lens to be detected and the test waveband range, so that the light intensity received by the energy detection assembly in the test waveband range is strong enough, and the light intensity is not saturated.
Optionally, collimating lens, diaphragm, convergent lens, wait to examine the camera lens and arrange in cage structure, convergent lens can follow cage pole in the cage structure slides, it is in to wait to examine the camera lens through anchor clamps cage structure is gone up and is put into and take off.
Optionally, when the lens to be measured is placed between the light source light path and the integrating sphere, the position of the lens to be measured on the cage bar is adjusted, so that light spots passing through the lens to be measured completely enter the integrating sphere.
Optionally, the energy detection component is an ultraviolet-visible light spectrometer or an infrared spectrometer with a high signal-to-noise ratio;
the ultraviolet-visible light spectrometer is used for testing the transmittance of the lens to be tested in the ultraviolet-visible light band, and the infrared spectrometer is used for testing the transmittance of the lens to be tested in the near-infrared band.
According to a second aspect of the present invention, there is provided a measuring method of a lens-width spectral transmittance measuring apparatus, comprising: the calculation formula of the transmittance of the lens to be measured is as follows:
T＝I1/I2；
I1detecting the received light intensity for not placing said energy detection assembly, I2The received light intensity is detected for placement into the energy detection assembly.
According to the device and the method for measuring the wide-spectrum transmittance of the lens, provided by the invention, the emergent energy value when the lens to be measured is not placed is recorded, and then the emergent energy value after the lens to be measured is placed is recorded, so that the transmittance levels of the lens to be measured under different wavelengths are accurately and quickly calculated; respectively recording the transmittance of the lens to be detected under different wavelengths when a tungsten halogen lamp and a deuterium lamp are turned on, and integrating the transmittance of the lens in ultraviolet-visible-near infrared bands; the collimating property requirement of the integrating sphere on incident light is not high, and weak light can be fully collected, so that the method can meet the detection requirements of rapidness, accuracy and easiness in operation in the actual production, processing and detection processes.
Drawings
FIG. 1 is a structural diagram of a wide-spectrum transmittance measuring device with a lens according to the present invention;
FIG. 2 is a flowchart of a measuring method of the lens broad spectrum transmittance measuring apparatus according to the present invention;
in the drawings, the components represented by the respective reference numerals are listed below:
1. deuterium and halogen composite light source, 2, optical fiber, 3, collimating lens, 4, diaphragm, 5, converging lens, 6 to-be-detected lens, 7, integrating sphere, 8, optical fiber, 9 and energy detection component.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.
Fig. 1 is a structural diagram of a lens broadband spectral transmittance measurement apparatus provided by the present invention, as shown in fig. 1, the measurement apparatus includes: the light source circuit, the integrating sphere 7 and the energy detection assembly 9; the lens 6 to be measured is placed between the light source circuit and the integrating sphere 7, and the integrating sphere 7 is connected with the energy detection assembly 9 through the optical fiber 8.
The light source light path emits light of different wave bands, and the light enters the energy detection assembly 9 after being collected by the integrating sphere 7.
The energy detection assembly 9 measures the energy values of the incident light when the lens 6 to be measured is not placed in and is placed in, and the transmittance of the lens 6 to be measured is obtained by comparing the two measured values.
In the specific implementation process, the emergent energy value when the lens is not placed is recorded, then the lens to be detected is placed between the converging lens and the integrating sphere 7, the position of the lens 6 to be detected is moved, the emergent light completely enters the integrating sphere 7, then the emergent energy value when the lens is placed is recorded, and the transmittance of the lens under corresponding different wavelengths is calculated through derivation of the two measured values.
In the process of measuring the transmittance of a sample to be measured, whether the sample to be measured is placed or not basically does not influence the collimation of a light beam when the sample to be measured is a planar product; when the sample to be tested is a lens, the lens is different from a plane product, and the lens can collimate the converged light beam or converge the parallel/collimated light beam, so that the collimation of the light beam for testing after passing through the lens can be changed. Aiming at the change of the light beam form (from collimated light to convergent light) after a test light beam passes through a lens to be tested, the invention provides a wide-spectrum transmittance measuring device for the lens, which utilizes the characteristic that an integrating sphere has no high collimation requirement on the light beam form entering the integrating sphere, and the integrating sphere is arranged between the lens to be tested and an energy detection assembly to test the transmittance of the lens, so that the transmittances of lenses with different focal lengths in wide spectrum ranges of ultraviolet, visible and near infrared bands can be quickly and accurately measured, a simple, quick and accurate measuring device and method are provided for the production and detection of the lens, the wide-spectrum transmittance measuring device and method are used for product processing and detection, and the controllability of a testing system is improved. The method can be applied to the fields of lens/lens processing, manufacturing, optical imaging, precision measurement, scientific research and the like.
Example 1
Embodiment 1 of the present invention is an embodiment of a lens-based wide-spectrum transmittance measurement apparatus, and as can be seen from fig. 1, the embodiment of the measurement apparatus includes: the light source circuit, the integrating sphere 7 and the energy detection assembly 9; the lens 6 to be measured is placed between the light source circuit and the integrating sphere 7, and the integrating sphere 7 is connected with the energy detection assembly 9 through the optical fiber 8. The light source light path emits light of different wave bands, and the light enters the energy detection assembly 9 after being collected by the integrating sphere 7.
In a possible embodiment mode, the light source optical path comprises a light source, and a collimating lens 3, a diaphragm 4 and a converging lens 5 which are arranged in sequence in the light emitting direction of the light source. The light source and the collimating lens 3 are connected through an optical fiber 2.
Specifically, the main devices used in the embodiments of the present invention are described below:
light source 1: the light source selected in the embodiment is a deuterium-halogen composite light source with the spectral range of 190-2500 nm.
Optical fiber 2& 8: the optical fibers selected in the present embodiment are ultraviolet-visible optical fibers (with an operating wavelength of 200-.
Collimating lens 3, converging lens 5: the achromatic lens selected in the embodiment is F90mm achromatic lens, the achromatic band is 200-1700 nm, and the transmittance is more than 80%.
And (4) diaphragm: the diaphragm selected in the embodiment is an iris diaphragm, and the size of the light-passing aperture can be adjusted within the range of 2-6 mm.
And 6, a lens to be tested: the lenses selected in the embodiment are F30mm, F90mm achromatic lens (working wave band is 200-1700 nm) and quartz composite wave plate (working wave band is 200-1700 nm), and the transmittance is more than 90%.
Integrating sphere 7: the integrating sphere selected in this embodiment is made of F4 material, and the inner diameter is 50mm of reflective integrating sphere (the working wavelength band is 200-.
The energy detection assembly 8: the energy detection components selected in the embodiment are an ultraviolet-visible spectrometer (working wavelength band is 200-.
In one possible embodiment mode, the light source is a deuterium-halogen composite light source 1.
When the deuterium-halogen composite light source 1 uses a halogen tungsten lamp light source, the measuring device is used for measuring the transmittance of a visible-near infrared band; when the deuterium-halogen composite light source 1 is a deuterium lamp light source, the measuring device is used for measuring the ultraviolet-visible wave band transmittance. The light emitting range of the deuterium halogen light source covers the designed wavelength range of the ultraviolet-visible-near infrared band of the composite lens to be detected. Different light sources are selected by switching, so that the transmittance of the lens in the ultraviolet-visible-infrared full-wave band is obtained.
In a possible embodiment, the converging lens 5 is an achromatic lens, and its achromatic band covers the transmittance detection range of the lens 6 to be measured.
Emergent light of the light source passes through the optical fiber 2 and the converging lens to obtain collimated parallel light in a wide spectral range, and the light spot is reduced to the required size by the diaphragm 4.
In a possible embodiment mode, the collimator lens 3 is an achromatic lens, and the achromatic band of the achromatic lens coincides with the transmittance detection range of the lens 6 to be measured.
In a possible embodiment, the diaphragm 4 is an iris diaphragm, and the diaphragm 4 is manually adjusted according to the size of the light-passing region of the lens 6 to be tested and the test waveband range, so that the light intensity received by the energy detection assembly 9 in the test waveband range is strong enough and the light intensity is not saturated.
In a possible embodiment mode, the collimating lens 3, the diaphragm 4, the convergent lens 5 and the lens to be inspected are arranged on the cage structure, the convergent lens 5 can slide along a cage rod in the cage structure, and the lens to be inspected is placed in and taken down from the cage structure through the clamp.
In a possible embodiment mode, when the lens 6 to be measured is placed between the light source circuit and the integrating sphere 7, the position of the lens 6 to be measured on the cage bar is adjusted, so that light spots passing through the lens 6 to be measured completely enter the integrating sphere 7.
In specific implementation, a light inlet of the integrating sphere can be a light inlet hole with the diameter of 20mm, incident light can completely enter the integrating sphere 7, a light outlet is an SMA905 interface and can be connected with an optical fiber 8 to enable emergent light to enter the energy detection assembly 9, and the working waveband of the integrating sphere 7 covers the transmittance test range of the lens 6 to be tested.
In a possible embodiment, the energy detection component 9 measures the energy of the incident light when the lens 6 to be measured is not placed in the optical system and when the lens 6 to be measured is placed in the optical system, and compares the two measured values to obtain the transmittance of the lens 6 to be measured.
The energy detection assembly 9 is an ultraviolet-visible spectrometer or an infrared spectrometer with a high signal-to-noise ratio.
The ultraviolet-visible light spectrometer is used for testing the transmittance of the lens to be tested 6 in the ultraviolet-visible light band, the infrared spectrometer is used for testing the transmittance of the lens to be tested 6 in the near-infrared band, and the wavelengths of the ultraviolet-visible light spectrometer and the visible-infrared spectrometer cover the transmittance testing wavelength range of the lens to be tested 6.
Example 2
Embodiment 2 provided by the present invention is an embodiment of a measuring method of a lens broadband spectral transmittance measuring apparatus provided by the present invention, and as shown in fig. 2, is a flowchart of the measuring method of the lens broadband spectral transmittance measuring apparatus provided by the present invention, and as can be seen by referring to fig. 1 and fig. 2, the embodiment of the measuring method includes:
step 1, recording the emergent energy value detected by the energy detection component 9 when the lens to be detected is not placed.
And 2, placing the lens to be detected between the light source light path and the integrating sphere 7, moving the position of the lens to be detected 6 to enable emergent light to completely enter the integrating sphere 7, and recording the emergent energy value detected by the energy detection assembly 9 when the lens to be detected is placed in the integrating sphere 7.
Step 3, the calculation formula for calculating the transmittance of the lens 6 to be measured is as follows: t ═ I1/I2。
I1For detecting the received light intensity without the energy-detecting element 9 being inserted, I2The received light intensity is detected for the insertion energy detection assembly 9.
Different light sources are selected by switching, so that the transmittance of the lens in the ultraviolet-visible-infrared full-wave band is obtained, namely the transmittance of the lens under different wavelengths is calculated by deduction of the two measured values.
It is understood that, in an embodiment, when the deuterium-halogen composite light source 1 uses a tungsten-halogen lamp light source, the measuring device is used for measuring the transmittance in the visible-near infrared band, and specifically includes:
emergent light of the halogen tungsten lamp light source is collimated into parallel light after passing through the optical fiber 2 and the converging lens, the converging lens is an achromatic lens in a wide spectral range, so that the parallel light with good collimation in the wide spectral range can be obtained, and then the light spot is reduced to small-size visible-near infrared collimated light with the required size through the diaphragm 4.
The small-sized visible-near infrared collimated light is converged by the achromatic converging lens 5 and then completely enters the integrating sphere 7, and the emergent light enters the energy detection assembly 9 from an SMA905 interface at the other end of the integrating sphere 7 and an optical fiber 8.
Recording energyThe detection component 9 detects the received visible-infrared light intensity I1(λvis－nir)。
And (3) assembling the lens 6 to be measured between the converging lens 5 and the integrating sphere 7, and adjusting the position of the lens 6 to be measured on the cage rod to enable light spots passing through the lens 6 to be measured to completely enter the integrating sphere 7. Detecting and recording the received light intensity I detected by the energy detection assembly 92(λvis－nir)。
The visible-near infrared transmittance of the lens 6 to be measured is calculated by the following formula:
Tvis－nir＝I1(λvis－nir)/I2(λvis－nir)。
in another embodiment, when the deuterium-halogen composite light source 1 is a deuterium lamp light source, the measurement device is used for measuring the ultraviolet-visible band transmittance, and specifically comprises:
emergent light of the deuterium lamp light source is collimated into parallel light after passing through the optical fiber 2 and the converging lens, the converging lens is an achromatic lens in a wide spectral range, so that parallel light with good collimation in the wide spectral range can be obtained, and then the light spot is reduced to small-size ultraviolet-visible collimated light with the required size through the diaphragm 4.
The small-sized ultraviolet-visible collimated light is converged by the achromatic converging lens 5 and then completely enters the integrating sphere 7, and the emergent light enters the energy detection assembly 9 from an SMA905 interface at the other end of the integrating sphere 7 and an optical fiber 8.
The recording energy detection component 9 detects the received visible-infrared light intensity I1(λuv－vis)。
And (3) assembling the lens 6 to be measured between the converging lens 5 and the integrating sphere 7, and adjusting the position of the lens 6 to be measured on the cage rod to enable light spots passing through the lens 6 to be measured to completely enter the integrating sphere 7.
Detecting and recording the received light intensity I detected by the energy detection assembly 92(λuv－vis)。
The transmittance of the ultraviolet-visible band of the lens 6 to be measured is calculated by the following formula:
Tvis－nir＝I1(λuv－vis)/I2(λuv－vis)。
transmittance T in ultraviolet-visible wave band rangevis－nirAnd a transmittance T in the visible-near infrared band rangevis－nirIntegration into a transmittance T of the entire UV-visible-near infrared (200-All band。
It should be noted that, in the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to relevant descriptions of other embodiments for parts that are not described in detail in a certain embodiment.
According to the device and the method for measuring the wide-spectrum transmittance of the lens, provided by the embodiment of the invention, the emergent energy value when the lens to be measured is not placed is recorded, and then the emergent energy value after the lens to be measured is placed is recorded, so that the transmittance levels of the lens to be measured under different wavelengths are accurately and quickly calculated; respectively recording the transmittance of the lens to be detected under different wavelengths when a tungsten halogen lamp and a deuterium lamp are turned on, and integrating the transmittance of the lens in ultraviolet-visible-near infrared bands; the collimating property requirement of the integrating sphere on incident light is not high, and weak light can be fully collected, so that the method can meet the detection requirements of rapidness, accuracy and easiness in operation in the actual production, processing and detection processes.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A lens wide-spectrum transmittance measurement device, comprising: the device comprises a light source circuit, an integrating sphere and an energy detection assembly; the lens to be measured is placed between the light source light path and the integrating sphere, and the integrating sphere is connected with the energy detection assembly through an optical fiber;
the light source light path emits light with different wave bands, and the light enters the energy detection assembly after being collected by the integrating sphere;
the energy detection assembly respectively measures the energy values of incident light when the lens to be detected is not placed in the lens to be detected and the energy values of incident light when the lens to be detected is placed in the lens to be detected, and the transmittance of the lens to be detected is obtained by comparing the two measured values.
2. The measurement device of claim 1, wherein the light source circuit comprises a light source that is a deuterium-halide composite light source;
when the deuterium and halogen composite light source uses a halogen tungsten lamp light source, the measuring device is used for measuring the transmittance of a visible-near infrared band;
when the deuterium-halogen composite light source is a deuterium lamp light source, the measuring device is used for measuring the ultraviolet-visible wave band transmittance.
3. The measuring device according to claim 2, wherein the light source path further comprises a collimating lens, a diaphragm and a converging lens which are sequentially arranged in the light emitting direction of the light source; the light source and the collimating lens are connected through an optical fiber.
4. The measuring device according to claim 3, wherein the converging lens is an achromatic lens, and an achromatic band covers a transmittance detection range of the lens to be measured;
emergent light of the light source passes through the optical fiber and the converging lens to obtain collimated parallel light in a wide spectral range, and the diaphragm reduces the light spot to the required size.
5. The measuring device according to claim 3, wherein the collimating lens is an achromatic lens, and an achromatic band thereof coincides with a transmittance detection range of the lens to be measured.
6. The measuring apparatus according to claim 4, wherein the diaphragm is an iris diaphragm, and the diaphragm is manually adjusted according to the size of the light-passing region of the lens to be measured and the test wavelength range, so that the light intensity received by the energy detecting element in the test wavelength range is strong enough and the light intensity is not saturated.
7. A measuring device as claimed in claim 3, wherein said collimating lens, said diaphragm, said converging lens, and said lens to be inspected are arranged on a cage structure, said converging lens can slide along a cage bar in said cage structure, and said lens to be inspected can be placed in and taken off said cage structure by a fixture.
8. The measuring device according to claim 7, wherein when the lens to be measured is placed between the light source circuit and the integrating sphere, the position of the lens to be measured on the cage bar is adjusted so that the light spot passing through the lens to be measured completely enters the integrating sphere.
9. The measurement device of claim 2, wherein the energy detection component is a high signal-to-noise ratio uv-vis spectrometer or an ir spectrometer;
the ultraviolet-visible light spectrometer is used for testing the transmittance of the lens to be tested in the ultraviolet-visible light band, and the infrared spectrometer is used for testing the transmittance of the lens to be tested in the near-infrared band.
10. A method for measuring the transmittance of a lens according to any one of claims 1 to 9, wherein the transmittance of the lens under test is calculated by the following formula:
T＝I1/I2；
I1detecting the received light intensity for not placing said energy detection assembly, I2The received light intensity is detected for placement into the energy detection assembly.
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