Development of Micro-Spectrophotometer and Its Application in Online Hexavalent Chromium Water Quality Monitoring Instrument

Table 1. Structural parameters of beam splitting system
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Table 1. Structural parameters of beam splitting system
Surfacetype Radius /mm Thickness /mm Tilt /(°)
S 40.0
M₁ 80.0 35.0 8
G Infinity 37.5 18
M₂ 152.4 65.0 28

Table 2. Tolerance distributions of spectrophotometer

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Table 2. Tolerance distributions of spectrophotometer

Tolerance type	M₁	M₁ to G	G	G to M₂	M₂
Index tolerance Δn	2C		2C		2C
Abbe tolerance ΔV	2C		2C		2C
Fringe tolerance N (546.1 nm)	1				1
Surface irregularity tolerance ΔN (546.1 nm)	0.5				0.5
Surface decenter tolerance /mm	0.05		0.05		0.05
Surface tilt tolerance /(')	1		1		1
Interval tolerance Δd /mm		0.05		0.05
Compensator of back focus /mm	0.1

Table 3. Wavelength calibration data

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Table 3. Wavelength calibration data

Fittingcoefficient	Pixelnumber	Standardwavelength /nm	Calibrationwavelength /nm	Relativeerror /nm
-46.066926	801	253.652	253.665	0.013
0.3842309	1111	365.015	365.029	0.014
-1.1850444×10^-5	1312	435.833	435.739	-0.094
-8.4414396×10^-10	1633	546.074	546.105	0.031
	1731	579.066	579.150	0.084
	2087	696.543	696.534	-0.009
	2296	763.511	763.439	-0.072
	2581	852.144	852.177	0.033

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Xinchun Lu, Yinghua Yuan, Yingqi Sun, Shudi Zhao, Yonggang Luo. Development of Micro-Spectrophotometer and Its Application in Online Hexavalent Chromium Water Quality Monitoring Instrument[J]. Laser & Optoelectronics Progress, 2018, 55(12): 122201

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