Topo WDS-5 Modular Grating Spectrometer
| Brand | Topo (TP) |
|---|---|
| Origin | Tianjin, China |
| Manufacturer Type | OEM Manufacturer |
| Model | WDS-5 |
| Focal Length | 500 mm |
| Wavelength Range | 200–800 nm |
| Relative Aperture | D/F = 1/7 |
| Grating Density | 1200 lines/mm (optional) |
| Wavelength Accuracy | ±0.4 nm |
| Wavelength Repeatability | ±0.2 nm |
| Spectral Resolution | <0.1 nm |
| Stray Light | ≤0.1% T |
| Slit Width Adjustment | 0–2 mm (continuous, vernier scale with 0.01 mm/division) |
| Slit Height | up to 20 mm |
| Interface | USB 2.0 |
| Dimensions (L×W×H) | 530 × 330 × 220 mm |
Overview
The Topo WDS-5 Modular Grating Spectrometer is a precision optical instrument engineered for high-fidelity spectral analysis across the ultraviolet–visible (UV–Vis) range (200–800 nm). Based on Czerny–Turner optical architecture, it employs a 500 mm focal length monochromator design with a high-efficiency 1200 lines/mm holographic or ruled grating (user-selectable), delivering robust wavelength dispersion and minimal optical aberration. Its D/F = 1/7 relative aperture ensures optimal light throughput without compromising resolution, making it suitable for both low-light fluorescence measurements and high-intensity absorption studies. The system operates as a modular platform—capable of functioning as a standalone scanning spectrometer, a tunable monochromator for excitation/emission isolation, or an integrated component in custom optical setups (e.g., coupled with CCD detectors, photomultiplier tubes, or fiber-optic interfaces). All mechanical and optical alignments are factory-optimized for long-term stability under laboratory conditions.
Key Features
- High-resolution spectral separation: <0.1 nm nominal resolution at 546.1 nm (Hg line), validated per ISO 17025 traceable calibration protocols
- Thermally stable aluminum alloy optical bench with kinematic mountings for grating and mirrors, minimizing drift during extended acquisitions
- Manually adjustable entrance and exit slits (0–2 mm width, 20 mm height), each equipped with a calibrated vernier scale (0.01 mm/division) for precise bandwidth control
- USB 2.0 interface enabling direct communication with Windows-based acquisition software; supports LabVIEW™ and MATLAB® instrument drivers via VISA
- Modular design allows interchangeable gratings (e.g., 300, 600, 1200, or 2400 L/mm) and optional motorized slit drives or automated filter wheels (sold separately)
- Stray light suppression ≤0.1% T achieved through multi-stage baffling, blackened internal surfaces, and optimized grating blaze matching
Sample Compatibility & Compliance
The WDS-5 accommodates free-space beam input from lamps (deuterium, tungsten-halogen, xenon arc), laser sources, or fiber-coupled probes (SMA905 compatible). It is routinely deployed in academic spectroscopy labs, materials characterization facilities, and QC environments for thin-film transmittance, solution-phase absorbance, and luminescence excitation profiling. While not certified for regulated GMP production, its mechanical repeatability (±0.2 nm wavelength reproducibility over 8-hour operation) and documented calibration history support GLP-compliant data generation. The instrument complies with IEC 61000-6-3 (EMC emission standards) and IEC 61010-1 (safety requirements for electrical equipment for measurement). Traceable wavelength calibration is performed using NIST-traceable Hg–Ne and Cd spectral lines prior to shipment.
Software & Data Management
Topo provides SpectraControl Lite—a cross-platform (Windows/macOS) application supporting real-time spectrum acquisition, peak identification, baseline correction, and export to CSV, TXT, or JCAMP-DX formats. The software implements linear interpolation for sub-pixel wavelength assignment and supports user-defined calibration curves. For integration into automated workflows, the device exposes SCPI-like command syntax over USB virtual COM port, enabling scripting for batch scans, time-resolved kinetics, or multi-wavelength monitoring. Audit trails (timestamped parameter changes, scan logs) are stored locally and can be exported for internal QA review. Though not 21 CFR Part 11 compliant out-of-the-box, the architecture supports third-party electronic signature and audit trail modules when deployed behind validated IT infrastructure.
Applications
- UV–Vis absorption spectroscopy of organic dyes, nanoparticles, and semiconductor quantum dots
- Excitation–emission matrix (EEM) mapping in environmental water quality analysis
- Optical filter characterization (transmission edge steepness, blocking range verification)
- Plasma emission line profiling in low-pressure discharge studies
- Educational demonstrations of diffraction theory, Rayleigh criterion, and instrumental line shape
- Pre-alignment tool for Raman or FTIR systems requiring precise wavelength referencing
FAQ
Is the WDS-5 compatible with CCD array detectors?
Yes—the exit port is configured for standard C-mount or F-mount adapters; users commonly integrate back-illuminated scientific CCDs or sCMOS sensors with 16-bit digitization.
Can the grating be changed in the field?
Grating replacement requires partial disassembly and realignment using alignment lasers and collimated reference sources; Topo recommends factory service or certified technician support for grating swaps.
What is the typical warm-up time before achieving specified wavelength accuracy?
Allow 30 minutes for thermal equilibration of the optical bench; wavelength accuracy improves to ±0.4 nm after stabilization.
Does the instrument include NIST-traceable calibration documentation?
Each unit ships with a calibration certificate listing measured deviations against primary spectral lines (Hg 253.7, 365.0, 404.7, 435.8, 546.1 nm; Ne 585.2, 640.2 nm), valid for 12 months from date of issue.
Is motorized wavelength scanning available as an option?
Motorized drive kits (stepper-motor + encoder feedback) are available as add-on modules; contact Topo Technical Sales for compatibility verification with your WDS-5 serial number.
