Low-energy-consumption wavelength and intensity composite standard lamp

Abstract

The invention discloses a low-energy-consumption wavelength and intensity composite standard lamp which structurally comprises a deep ultraviolet module, a visible-infrared module, a micro-channel heat dissipation structure and a rare earth sharp line calibration unit. The core innovation is that a rare earth sharp line calibration unit is integrated on the basis of a standard intensity lamp, that is, a cuvette filled with a Re (Er-Ho-Dy) (NO3) 3 or Re (Er-Ho-Dy) (ClO4) 3 ternary mixed solution is additionally arranged at a light source outlet. The device has the beneficial effects that the device can be switched to a sharp line mode on the basis of an intensity calibration function to realize high-precision wavelength calibration, is compact in integration, and adapts to a portable detection scene.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of optical metrology, and particularly relates to a full-waveband composite standard light source covering deep ultraviolet to mid-infrared. The light source integrates a rare earth sharp line calibration unit, while retaining the 240-3000 nm continuous spectrum output, a built-in multi-waveband wavelength reference function is added, which makes up for the lack of real-time wavelength self-calibration capability of traditional calibration light sources. BACKGROUND

[0002] The traditional wide-waveband standard lamp has two limitations: first, wavelength calibration needs to rely on an external monochromator, which is easy to introduce spectral error (≥±0.1 nm) and light path misalignment risk; second, the external light splitting system (such as a monochromator, a lock-in amplifier) leads to a large device, which is difficult to integrate into portable or embedded optical instruments. SUMMARY

[0003] The present application innovatively integrates a rare earth sharp line calibration unit on the basis of a standard intensity lamp. The rare earth sharp line calibration unit is composed of a short optical path two-pass optical quartz cuvette (optical path 1-5 mm), a built-in single (such as Ho 3+ ) or multi-element (such as Er 3+ , Ho 3+ , Dy 3+ ) rare earth ion mixed aqueous solution (such as Re (Er - Ho - Dy) (NO3)3 or Re (Er - Ho - Dy) (ClO4)3 and an expansion guide rail, which realizes double-mode lossless switching through axial in / out: in intensity calibration mode, the calibration unit is completely removed from the light path, retaining the original 240-3000 nm continuous spectrum output; in wavelength calibration mode, the calibration unit is cut into the light path exit position, and the Er 3+ : Ho 3+ : Dy 3+ mixed solution produces characteristic sharp lines (half-width ≤0.5 nm) in the visible-near infrared band, while allowing deep ultraviolet bands (240-400 nm) to directly penetrate.

[0004] Key design breakthroughs: (1) Ho 3+ (241.0 / 287.0 / 354.0 / 416.0 / 480.0 / 520.0 / 575.0 / 641.0 / 740.0 / 794.0 / 2060.0 nm), Dy 3+ (864.0 / 2830.0 nm), Er 3+ (977.0 / 1535.0 nm) realize full coverage of 240-3000 nm key wavelength points; (2) Solution stability: nitrogen-filled sealing design inhibits nitrate optical decomposition, with an effective period ≥18 months. Advantages

[0005] Multi-mode seamless switching: continuous spectrum mode light intensity loss ≤2%, sharp line mode wavelength calibration accuracy better than ±0.1 nm; Real-time self-verification: can dynamically verify the drift of wavelength reference during spectrometer calibration; Compact integration: overall size Φ60 mm x 50 mm (only increase 5 mm bottom radius length), power consumption increase ≤1 W. DETAILED DESCRIPTION

[0006] Example 1: Laboratory high-precision type Calibration unit: optical path 3 mm quartz cuvette, solution concentration 0.5 mol / L, Er 3+ : Ho 3+ : Dy 3+ = x : y : z (1 ≤ x, y, z ≤ 10).

[0007] Example 2: Industrial online type Mechanical structure: electromagnetic telescopic guide rail, integrated micro spectrometer feedback interface; Control: PLC programming switching instruction, synchronous trigger spectrometer acquisition mode conversion. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 : Composite standard lamp structure diagram (newly added label 5: multi-spectral dynamic light filtering switching module; 5a: light filter; 5b: telescopic guide rail; newly added label 6: telescopic sharp line calibration unit; 6a: cuvette; 6b: telescopic guide rail).

[0009] Figure 2 : Three rare earth ions (Er 3+ : Ho 3+ : Dy 3+ ) characteristic sharp line spectrum. INNOVATION EXPLANATION

[0010] Functional integration breakthrough: for the first time, continuous spectrum intensity calibration and discrete wavelength reference multi-function are integrated in a single light source, and the original light path integrity is preserved through mechanical avoidance design; Multi-ion solution formula: multi-element rare earth ion mixing realizes high stability sharp line (240-3000 nm key wavelength points are fully covered), half-height width is compressed to below 0.5 nm.

Claims

1. A low energy wavelength and intensity compound standard lamp characterized in that Comprise: DUV module, visible-infrared module and rare earth sharp line calibration unit, which is installed at the exit of light source and controlled by mechanical telescopic device to cut in / out the light path.

2. The deep ultraviolet module of claim 1, wherein: DUV LED is fixed in the inner wall of aluminum alloy frame at a specific angle (45°-60°) to produce scattered light as close to vertical irradiation of the fluorescent conversion layer as possible to achieve maximum luminous flux.

3. The visible-infrared module of claim 1, wherein: Tungsten lamp with color temperature of 2800K is installed on the opposite side of the LED by the base to produce scattered light as close to vertical irradiation of the fluorescent conversion layer as possible to achieve maximum luminous flux.

4. The sharp line calibration unit of claim 1, wherein: The device includes a telescopic guide rail and an optical absorption module, which can be a two-way light transparent rare earth doped bulk material or a quartz cuvette filled with a single (e.g., Ho 3+ ) or multi-element (e.g., Er 3+ , Ho 3+ , Dy 3+ ) rare earth ion mixed aqueous solution (e.g., Re (Er - Ho - Dy) (NO3)3 or Re (Er - Ho - Dy) (ClO4)3). The telescopic guide rail drives the optical absorption module to move radially.

5. The rare earth doped bulk material of claim 4, wherein: The bulk material can be fluoride, glass, crystal, ceramic, and the relative proportion of rare earth ions in the bulk material is Er 3+ : Ho 3+ : Dy 3+ =x : y : z (1≤x, y, z≤10), the bulk material generates characteristic sharp line absorption with half-width ≤0.1 nm at 241.0 / 287.0 / 354.0 / 416.0 / 480.0 / 520.0 / 575.0 / 641.0 / 740.0 / 794.0 nm (Ho 3+ ), 864 nm (Dy 3+ ), 977.0 / 1535.0 nm (Er 3+ ), 2060.0 nm (Ho 3+ ), 2830.0 nm (Dy 3+ ), and the line intensity absorption peak intensity stability is ≥98%.

6. The mixed aqueous solution of claim 4, wherein: The relative proportion of rare earth ions in the solution is Er 3+ : Ho 3+ :Dy 3+ =x : y : z (1≤x, y, z≤10), the solution produces characteristic sharp line absorption with half-height width ≤0.5 nm at 241.0 / 287.0 / 354.0 / 416.0 / 480.0 / 520.0 / 575.0 / 641.0 / 740.0 / 794.0 nm (Ho 3+ ), 864 nm (Dy 3+ ), 977.0 / 1535.0 nm (Er 3+ ), 2060.0 nm (Ho 3+ ), 2830.0 nm (Dy 3+ ), and the line intensity absorption peak intensity stability is ≥98%.

7. A multi-mode spectral calibration method based on the standard lamp of any one of claims 1-6, characterized by the steps of: Continuous spectrum mode: retract the light filter switching module and the sharp line calibration unit, and simultaneously start the UV LED and halogen tungsten lamp to output 240-3000 nm continuous spectrum; Sharp line calibration mode: cut in the calibration unit, use rare earth solution to calibrate the wavelength at the characteristic sharp lines of 241.0 / 287.0 / 354.0 / 416.0 / 480.0 / 520.0 / 575.0 / 641.0 / 740.0 / 794.0 / 864.0 / 977.0 / 1535.0 / 2060.0 / 2830.0 nm, with calibration error ≤±0.5 nm; High-precision sharp line calibration mode: cut in the calibration unit, use rare earth bulk material to calibrate the wavelength at the characteristic sharp lines of 241.0 / 287.0 / 354.0 / 416.0 / 480.0 / 520.0 / 575.0 / 641.0 / 740.0 / 794.0 / 864.0 / 977.0 / 1535.0 / 2060.0 / 2830.0 nm, with calibration error ≤±0.1 nm.

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