MMS - Extremely compact design with no moving part

Introduction

The MMS spectrometer family delivers compact, robust measurement instruments. The spectrometer is equipped with a high performance detector for portable, process and OEM applications. The unique design provides permanent calibration and thermal stability to guarantee accurate and reliable measurements simultaneously for UV and NIR. The absence of any moving parts guarantees long lifetime and high durability.

Components of the MMS family

Cross-section converter as optical input
Imaging grating
Diode array as opto-electronic output
Interfaces, processing software and support

Highlights

Benefits

Reliable, permanently aligned
No movable parts
Robust, even in harsh environments
Compact
Fast, Simultaneous read-out
Permanently calibrated
High dynamic range
High light sensitivity
High reproducibility
Low temperature drift

Design

Equipped with the silicon photo diode array S3904-256Q from Hamamatsu (only the MMS 1 NIR enhanced spectrometer utilized with the S8381-256Q from Hamamatsu to achieve higher NIR sensitivity)
Arrays are packed in a shorter and special housing which results in a very small split-off angle
Diode array has been directly coated with a dielectric cut-off filter
Holographic blazed, flat field gratings (master grating has its efficiency maximum at approx. 220 nm)
Fixed grating, optimally protected against dust and gases
Central body contains a glass element similar to a lens (MMS 1)
Solid glass element has been replaced by hollow shell, attached to grating and detector (in UV sensitive modules)
Fiber-bundle cross-section converter optimizes the light sensitivity
Option of modifying fiber length and input design
Solarization resistant fiber to avoid transmission loss in the deep UV and to prevent fiber damage

Video

Specification

	MMS 1	MMS UV-VIS	MMS UV
Optical entrance	Fiber bundle consisting of approx. 30 Quartz glass fibers with 70 µm core diameter each, designed as cross section converter	Fiber bundle consisting of approx. 30 Quartz glass fibers with 70 µm core diameter each, designed as cross section converter	Fiber bundle consisting of approx. 15 Quartz glass fibers with 70 µm core diameter each, designed as cross section converter
Input round	Diameter: 0.5 mm NA = 0.22 (has to be filled for full specification) mounted in SMA-coupling	Diameter: 0.5 mm NA = 0.22 (has to be filled for full specification) mounted in SMA-coupling	Diameter: 0.4 mm NA = 0.22 (has to be filled for full specification) mounted in SMA-coupling
Output linear	70 µm x 2,500 µm (optical entrance)	70 µm x 2,500 µm (optical entrance)	70 µm x 1,250 µm (optical entrance)
Grating	Flat-field, 366 l/mm (center)	Flat-field, 366 l/mm (center), blazed for approx. 220 nm	Flat-field, 1084 l/mm (center), blazed for approx. 220 nm
Diode array	Hamamatsu S3904-256Q in a special housing (S5713) (S8381-256Q for MMS 1 NIR enh.), 256 pixels	Hamamatsu S3904-256Q in a special housing (S5713), 256 pixels	Hamamatsu S3904-256N in a special housing (S5713), 256 pixels
Spectral range	310-1,100 nm specifications for the range 360-900 nm (UV-VIS enhanced) 400-1,000 nm (NIR enhanced)	190-720 nm specifications for the range 220-720 nm 250-780 nm specifications for the range 250-780 nm	195-390 nm specifications for the range 220-390 nm
Wavelength accuracy	0.3 nm	0.5 nm	0.2 nm
Temperature - induced drift	< 0.01 nm/K	< 0.006 nm/K	< 0.005 nm/K
Mean spectral pixel pitch	Δ λ pixel ≈ 3.3 nm	Δ λ pixel ≈ 2.2 nm	Δ λ pixel ≈ 0.8 nm
Resolution	Δ λ FWHM ≈ 10 nm	Δ λ FWHM ≈ 7 nm	Δ λ FWHM ≈ 3 nm
Sensitivity	≈ 10³ Vs / J	≈ 10³ Vs / J	≈ 10³ Vs / J
Straylight	≤ 0.8 % with Halogen lamp for UV-VIS enhanced as transmission at 450 nm with filter GG 495 ≤ 0.2 % with Halogen lamp for NIR enhanced as transmission at 650 nm with filter RG 695	≤ 0.3 % with Deuterium lamp as transmission at 310 nm with NaNO₂-solution (50 g/l)	≤ 0.3 % Deuterium lamp as transmission at 240 nm with NaI-solution (10 g/l)
Dimensions	70 x 50 x 40 mm³	67 x 60 x 40 mm³	70 x 60 x 40 mm³
Cross section converter Minimal bending radius	240 mm standard, up to 1 m available 40 mm	240 mm standard, up to 1 m available 40 mm	240 mm standard, up to 1 m available 40 mm