Schematic diagram
S1: Entrance slit M1: Plane mirror
M2 and M3: Spherical mirrors
G: Grating S2: PMT
M4: Folding mirror S3: CCD
Display panel of PMT software
(Click figure to enlarge)
Measured Hg spectrum using PMT
(Click graph to enlarge)
Display panel of CCD software
(Click figure to enlarge)
Measured spectrum of Sodium lamp
(Click graph to enlarge)
PMT measured spectrum of Hydrogen-Deuterium lamp around 656 nm
(Click graph to enlarge)
CCD measured spectrum of Hydrogen-Deuterium lamp around 656 nm
(Click graph to enlarge)
Note: computer not included
Features
Replaceable gratings for different spectral range and resolution needs
Modular structure
Two detectors included (photomultiplier and CCD)
Optional fiber optic adapters and cuvette holders
Introduction
The LEOI-101 Modular Multifunctional Grating Spectrometer is an advanced optical instrument designed to help students and researchers understand the principles of light and wave phenomena. This spectrometer offers the flexibility of adjusting its spectral range and resolution by replacing the default grating with different gratings, making it adaptable for a wide range of experiments.
The modular design of the LEOI-101 allows it to function in photomultiplier tube (PMT) mode or CCD mode, with the mode selection being easily toggled via a mechanical switch. This makes it suitable for both basic and more advanced applications in spectral analysis. Additionally, the spectrometer can be configured as a monochromator when the CCD device is removed, providing high wavelength accuracy for precise measurements.
Operational Principle: Light is directed into the spectrometer and dispersed through a grating, which splits the light into its component wavelengths. Depending on the mode selected (PMT or CCD), the light is detected either by a photomultiplier tube for high sensitivity or by a CCD detector for real-time spectral acquisition. The wavelength is scanned using a sine mechanism, allowing the spectrometer to cover a broad range of wavelengths with high accuracy. The spectral data is collected and analyzed, either displayed via a connected computer (for CCD mode) or analyzed in real-time (for PMT mode).
Using optional cuvette holders, absorbance of various samples in a standard cuvette can be measured; using optional fiber optic adapters, both entrance and exit slits of the spectrometer can be converted to accommodate fiber optic devices. To calibrate the spectrum of a selected work window in CCD mode, at least two standard spectral lines are needed within the spectral range of the work window.
Specifications
| Description | Specifications |
| Focal Length | 500 mm |
Wavelength Range | Grating A: 200 ~ 660 nm; Grating B: 200 ~ 800 nm |
| Slit Width | 0~2 mm adjustable with a reading resolution of 0.01 mm |
| Relative Aperture | D/F=1/7 |
Grating | Grating A*: 2400 lines/mm; Grating B:1200 lines/mm |
| Blazed Wavelength | 250 nm |
Wavelength Accuracy | Grating A: ± 0.2 nm; Grating B: ± 0.4 nm |
Wavelength Repeatability | Grating A: ≤ 0.1 nm; Grating B: ≤ 0.2 nm |
| Stray Light | ≤ 10 -3 |
Resolution | Grating A: ≤ 0.06 nm; Grating B: ≤ 0.1 nm |
| Photomultiplier Tube (PMT) | |
Wavelength Range | Grating A: 200 ~ 660 nm; Grating B: 200 ~ 800 nm |
| CCD | |
| Receiving Unit | 2048 cells |
Spectral Response Range | Grating A: 300 ~ 660 nm; Grating B: 300 ~ 800 nm |
| Integration Time | 88 steps (each step: approximately 25 ms) |
| Filter | White filter: 320~ 500 nm; yellow filter: 500~ 660 nm |
| Dimensions | 560×380×230 mm |
| Weight | 30 kg |
| Software | Compatible with Windows 10/11 |
* Grating A is the default grating pre-installed in spectrometer.
Parts List
| Description | Qty |
| Grating Monochromator | 1 |
| Power Control Box | 1 |
| Photomultiplier Receiving Unit | 1 |
| CCD Receiving Unit | 1 |
| USB Cable | 1 |
| Filter Set | 1 |
| Power Cord | 1 |
| Signal Cable | 2 |
| Software CD | 1 |
| Optional Cuvette Holder with Dovetails (p/n: DF-1) | 1 |
| Optional Cuvette Holder with Fiber Optic Connectors (p/n: DF-3) | 1 |
| Optional Fiber Optic Adapter to Entrance Slit (p/n: FA-SMA-1) | 1 |
| Optional Fiber Optic Adapter to Exit Slit (p/n: FA-SMA-2) | 1 |
Schematic diagram
S1: Entrance slit M1: Plane mirror
M2 and M3: Spherical mirrors
G: Grating S2: PMT
M4: Folding mirror S3: CCD
Display panel of PMT software
(Click figure to enlarge)
Measured Hg spectrum using PMT
(Click graph to enlarge)
Display panel of CCD software
(Click figure to enlarge)
Measured spectrum of Sodium lamp
(Click graph to enlarge)
PMT measured spectrum of Hydrogen-Deuterium lamp around 656 nm
(Click graph to enlarge)
CCD measured spectrum of Hydrogen-Deuterium lamp around 656 nm
(Click graph to enlarge)
