Multiband stray light testing device

Abstract

The utility model discloses a multiband stray light testing device which comprises a light source assembly, an optical filter assembly, a testing assembly, a rotary table assembly and a main control computer. Wherein the light source assembly comprises a light source, a stabilized voltage supply, an adjustable collimator and an optical fiber coupler; the stabilized power supply is connected with a light source circuit; the light source is in coupling connection with the adjustable collimator through the optical fiber coupler; the optical filter assembly is arranged opposite to the light emitting end of the adjustable collimator; the test assembly is arranged opposite to the light emitting end of the optical filter assembly; the rotary table assembly is fixedly connected with the adjustable collimator; and the main control computer is in circuit connection with the voltage-stabilized power supply and the adjustable collimator respectively. The stray light testing device is helpful for carrying out stray light testing on a small spectrum analysis instrument in a laboratory, and fills up the analysis technology vacancy of the instrument of this type. The multiband stray light testing device provided by the utility model is simple in structure and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of multi-band stray light testing, and more particularly to a multi-band stray light testing device. Background Art

[0002] At present, it is very important to establish a stray light noise test device to measure the complete instrument after design and assembly to obtain the actual stray light level of the system. This is the key to ultimately determine and verify the instrument's true stray noise suppression capability.

[0003] Utility model publication number CN214539272U discloses a stray light testing system. It utilizes an integrating sphere to achieve uniform illumination, adjusting the illumination brightness via a current controller to meet the testing requirements of lenses with varying spectral and brightness requirements. Combined with a large light trap, it achieves a high brightness contrast ratio exceeding 1000:1, ensuring the accuracy of test results. While this utility model optimizes the illumination source based on the integrating sphere and large light trap, the test structure is bulky. While this improves brightness accuracy, it is not suitable for testing small laboratory spectrometers or other optical systems.

[0004] Therefore, how to provide a multi-band stray light testing device that helps to carry out stray light testing on small laboratory spectrum analyzers while simplifying the structural complexity of the testing device is a problem that technicians in this field urgently need to solve. Utility Model Content

[0005] In view of this, the present invention provides a multi-band stray light testing device to at least solve some of the technical problems mentioned in the above background technology.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a multi-band stray light testing device, comprising: a light source component, a filter component, a testing component, a turntable component and a main control machine;

[0008] The light source assembly includes a light source, a voltage-stabilized power supply, an adjustable collimator and a fiber coupler;

[0009] The voltage-stabilized power supply is connected to the light source circuit;

[0010] The light source is coupled to the adjustable collimator via the optical fiber coupler;

[0011] The filter assembly is installed facing the light emitting end of the adjustable collimator;

[0012] The test component is installed facing the light emitting end of the filter component;

[0013] The turntable assembly is fixedly connected to the adjustable collimator;

[0014] The main control machine is connected to the voltage-stabilized power supply and the adjustable collimator circuit respectively.

[0015] Furthermore, the filter assembly includes a filter wheel and a plurality of narrow-band filters of different wavelength bands;

[0016] The filter wheel is installed facing the light emitting end of the adjustable collimator;

[0017] The plurality of narrowband filters of different wavelength bands are fixed to a plurality of different hole positions of the filter wheel via threads and locking rings; and the main optical axis of each narrowband filter (10) is coupled to the main optical axis of the adjustable collimator (8).

[0018] Furthermore, the narrowband filter is a shortwave pass filter.

[0019] Furthermore, the test assembly includes: an instrument to be tested and an imaging device;

[0020] The light entrance window of the instrument under test is in contact and coupled with the narrowband filter;

[0021] The imaging device is installed at the imaging focal plane of the instrument under test.

[0022] Furthermore, the imaging device is a CCD camera that can capture wavelengths from 180nm to 900nm.

[0023] Furthermore, the optical axes of the adjustable collimator, the narrowband filter and the instrument to be tested are on the same straight line and at the same horizontal height.

[0024] Furthermore, the turntable assembly includes a servo motor turntable and an ARM control device;

[0025] The adjustable collimator is fixed to the servo motor turntable through a threaded hole, and the main optical axis adjustment reference is 0°;

[0026] The ARM control device is connected to the servo motor turntable circuit.

[0027] Furthermore, the ARM control device adopts an STM32 main control chip.

[0028] Furthermore, the main control machine adopts an FPGA chip.

[0029] It can be seen from the above technical solutions that, compared with the prior art, the present invention provides a multi-band stray light testing device, which has the following beneficial effects:

[0030] The multi-band stray light testing device provided by the utility model is helpful for carrying out stray light testing on small-sized spectrum analysis instruments in laboratories, thus filling the gap in analysis technology for such instruments.

[0031] The utility model adopts the form of a light source plus a filter wheel to realize stray light testing of multiple different bands without the need to replace different light sources, thereby realizing convenient operation of light source integration.

[0032] The utility model adopts a collimating lens with adjustable output aperture, which can be adapted to instruments to be tested with different apertures without the need to replace parts.

[0033] Traditional methods place the instrument under test on a turntable, increasing the size of the test setup and the complexity of other components. However, the present invention incorporates a high-precision servo motor turntable within the light source, which adjusts the angle of the adjustable collimator. This simplifies the overall structure and eases operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0035] Figure 1 This is a structural schematic diagram of the multi-band stray light testing device provided by the utility model.

[0036] Among them: 1-light source assembly; 2-filter assembly; 3-test assembly; 4-turntable assembly; 5-main control machine; 6-light source; 7-regulated power supply; 8-adjustable collimator; 9-filter wheel; 10-narrowband filter; 11-instrument to be tested; 12-imaging device; 13-servo motor turntable; 14-ARM control device; 15-fiber coupler. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] The present invention discloses a multi-band stray light testing device. Figure 1As shown, it includes: a light source component 1, a filter component 2, a test component 3, a turntable component 4 and a main control machine 5; wherein:

[0039] The light source assembly 1 includes a light source 6, a voltage-stabilized power supply 7, an adjustable collimator 8 and a fiber coupler 15;

[0040] The voltage-stabilized power supply 7 is connected to the light source 6;

[0041] The light source 6 is coupled to the adjustable collimator 8 via a fiber coupler 15;

[0042] The filter assembly 2 is installed facing the light emitting end of the adjustable collimator 8;

[0043] The test component 3 is installed facing the light emitting end of the filter component 2;

[0044] The turntable assembly 4 is fixedly connected to the adjustable collimator 8;

[0045] The main control machine 5 is connected to the voltage-stabilized power supply 7 and the adjustable collimator 8 respectively.

[0046] Next, each of the above components is described in detail.

[0047] 1. Light source component 1:

[0048] The light source assembly 1 is used to emit a collimated parallel light source with an adjustable output aperture through a stabilized power supply 7, a light source 6, a fiber coupler 15 and an adjustable collimator 8; wherein:

[0049] The light source assembly 1 uses a continuous light source covering 180nm-900nm, which can realize the band test of the instrument under test 11 in this embodiment;

[0050] The voltage-stabilized power supply 7 is connected to the light source 6 circuit and is used to provide the light source 6 with an operating voltage;

[0051] The light source 6 is coupled to the adjustable collimator 8 through the fiber coupler 15 to collimate and expand the optical fiber output from the light source 6, thereby emitting a collimated parallel light source.

[0052] The light source 6 is a point light source. In a specific application, its wavelength requirement can be selected according to the detection requirements and the working wavelength of the instrument under test 11 .

[0053] 2. Filter assembly 2:

[0054] The filter assembly 2 is installed directly opposite the light emitting end of the adjustable collimator 8; this helps to transmit the collimated parallel light source to the filter assembly 2, so that the wavelength band of the collimated parallel light source can be selected through the filter assembly 2; the filter assembly 2 includes a filter wheel 9 and multiple narrowband filters 10 of different wavelength bands;

[0055] The filter wheel 9 is installed opposite to the light emitting end of the adjustable collimator 8, which helps the collimated parallel light source emitted by the adjustable collimator 8 to pass through the filter wheel 9;

[0056] Multiple narrowband filters 10 of different wavelength bands are fixed to different holes of the filter wheel 9 via threads and locking rings. The main optical axis of each narrowband filter 10 is coupled to the main optical axis of the adjustable collimator 8. Based on this, the narrowband filters 10 of different wavelength bands can be used to select different wavelength bands for the collimated parallel light source emitted by the adjustable collimator 8, and the integration of light sources of multiple wavelength bands is achieved through the wheel.

[0057] The hole diameter of the above-mentioned filter wheel 9 is 50 mm; the narrowband filter 10 is a shortwave pass filter covering the far ultraviolet band (180 nm-400 nm), the visible light band (400 nm-750 nm) and the near infrared band (750 nm-900 nm); in specific applications, the specific filtering band of the narrowband filter 10 can be selected according to the detection requirements and the working band of the instrument to be tested 11.

[0058] 3. Test component 3:

[0059] The test assembly 3 is installed facing the light emitting end of the filter assembly 2, which helps to make the filtered collimated parallel light source incident on the test assembly 3 and realize light source imaging; the test assembly 3 includes a test instrument 11 and an imaging device 12;

[0060] The instrument under test 11 is a small laboratory spectrometer, and the light entrance window of the instrument under test 11 is directly contacted and coupled with the narrowband filter 10. In particular, the instrument under test 11 and the narrowband filter 10 can be directly contacted with each other. Since the light emitted by the adjustable collimator 8 is completely collimated light, the direct contact and tight coupling can ensure that the collimated light fills the entire entrance pupil window of the instrument under test 11, and avoids the incidence of ambient stray light.

[0061] The imaging device 12 is installed at the imaging focal plane of the instrument under test 11; the imaging device 12 is a CCD camera that can capture images in the 180nm-900nm band.

[0062] The optical axes of the adjustable collimator 8, the narrowband filter 10 and the instrument under test 11 are on the same straight line and at the same horizontal height.

[0063] 4. Turntable assembly 4:

[0064] The turntable assembly 4 is fixedly connected to the adjustable collimator 8 and is used to adjust the angle of the adjustable collimator 8; the turntable assembly 4 includes a servo motor turntable 13 and an ARM control device 14; wherein:

[0065] The adjustable collimator 8 is fixed to the servo motor turntable 13 through a threaded hole, and the 0° rotation angle is used as the main optical axis adjustment reference;

[0066] The ARM control device 14 uses an STM32 main control chip and is connected to the servo motor turntable 13 circuit to control the rotation of the servo motor turntable 13, thereby driving the adjustable collimator 8 to rotate, achieving high-precision, micro-angle rotation of the adjustable collimator 8, for example, the angle of each rotation can be controlled within ±10°.

[0067] 5. Master machine 5:

[0068] The main control machine 5 is connected to the voltage-stabilized power supply 7 and the adjustable collimator 8 respectively, and is used to control the start-up of the voltage-stabilized power supply 7 and to adjust the output aperture of the adjustable collimator 8 .

[0069] The main control machine 5 uses an FPGA chip and its configuration circuit to achieve high-precision coordinated control of several components.

[0070] The multi-band stray light testing device provided by the utility model has the following features in specific applications:

[0071] First, according to the working band and imaging mode of the instrument under test 11 and the number of stray light test bands required, multiple narrowband filters 10 with different bands are selected and fixed to multiple different holes of the filter wheel 9 through threads and locking rings.

[0072] Secondly, after adjusting the output aperture of the adjustable collimator 8 through the main control machine 5 according to the entrance pupil area of ​​the instrument under test 11, the adjustable collimator 8 is fixed on the servo motor turntable 13, and the 0° rotation angle is used as the main optical axis adjustment reference.

[0073] Next, the optical axes of the adjustable collimator 8 and the filter wheel 9 are adjusted so that the optical axes of the adjustable collimator 8 and the narrowband filter 10 are in the same straight line and at the same level as the optical axis of the instrument under test 11 .

[0074] Finally, the voltage-stabilized power supply 7 is turned on to provide the light source 6 with an operating voltage; and the test is started.

[0075] After the voltage-stabilized power supply 7 is turned on, the light source 6 is emitted and passes through the optical fiber coupler 15 and the adjustable collimator 8 to generate a collimated parallel light source; the wavelength band of the incident collimated parallel light source is filtered by multiple narrow-band filters 10, so that the filtered collimated parallel light source is incident on the instrument under test 11, so that the instrument under test 11 is imaged at the imaging device 12.

[0076] After a round of testing is completed, the servo motor turntable 13 can be adjusted to rotate a preset angle by the ARM control device 14 to perform a new round of testing. A new round of testing can also be performed by replacing multiple narrowband filters 10 of different bands.

[0077] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0078] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-band stray light testing device, characterized in that: include: Light source assembly (1), filter assembly (2), test assembly (3), turntable assembly (4) and main control machine (5); The light source assembly (1) comprises a light source (6), a voltage-stabilized power supply (7), an adjustable collimator (8) and a fiber coupler (15); The voltage-stabilized power supply (7) is connected to the light source (6) circuit; The light source (6) is coupled to the adjustable collimator (8) via the optical fiber coupler (15); The filter assembly (2) is installed facing the light emitting end of the adjustable collimator (8); The test component (3) is installed facing the light emitting end of the filter component (2); The turntable assembly (4) is fixedly connected to the adjustable collimator (8); The main control machine (5) is connected to the stabilized power supply (7) and the adjustable collimator (8) respectively.

2. The multi-band stray light testing device according to claim 1, characterized in that: The filter assembly (2) comprises a filter wheel (9) and a plurality of narrow-band filters (10) of different wavelength bands; The filter wheel (9) is installed facing the light emitting end of the adjustable collimator (8); The plurality of narrowband filters (10) of different wavelength bands are fixed to a plurality of different hole positions of the filter wheel (9) via threads and locking rings; and the main optical axis of each narrowband filter (10) is coupled to the main optical axis of the adjustable collimator (8).

3. The multi-band stray light testing device according to claim 2, characterized in that: The narrowband filter (10) is a short-wave pass filter.

4. The multi-band stray light testing device according to claim 2, characterized in that: The test assembly (3) includes: an instrument to be tested (11) and an imaging device (12); The light entrance window of the instrument to be tested (11) is in contact with and coupled to the narrowband filter (10); The imaging device (12) is installed at the imaging focal plane of the instrument under test (11).

5. The multi-band stray light testing device according to claim 4, characterized in that: The imaging device (12) is a CCD camera capable of collecting wavelengths covering the 180nm-900nm band.

6. The multi-band stray light testing device according to claim 4, characterized in that: The optical axes of the adjustable collimator (8), the narrowband filter (10) and the instrument to be measured (11) are on the same straight line and at the same horizontal height.

7. The multi-band stray light testing device according to claim 1, characterized in that: The turntable assembly (4) includes a servo motor turntable (13) and an ARM control device (14); The adjustable collimator (8) is fixed on the servo motor turntable (13) through a threaded hole, and uses a 0° rotation angle as a reference for adjusting the main optical axis; The ARM control device (14) is connected to the servo motor turntable (13) by a circuit.

8. The multi-band stray light testing device according to claim 7, characterized in that: The ARM control device (14) adopts an STM32 main control chip.

9. The multi-band stray light testing device according to claim 1, characterized in that: The main control machine (5) adopts an FPGA chip.

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