Transmittance & Reflectance Testing System

The integrating sphere transmittance and reflectance testing system is a high-precision optical analysis device for simultaneously measuring material transmittance, reflectance, and absorptance. It utilizes the unique geometry of the integrating sphere to achieve efficient light collection and uniformity, making it especially suitable for measuring diffuse reflective and transmissive materials (films, solids, powders).

1. System Components

The system includes the integrating sphere, fiber optic spectrometer, transmission/reflectance measurement stand, multimode fiber, and deuterium-halogen combined light source.

Applications:

1. Transmittance Integrating Sphere

The transmittance integrating sphere is made from imported high diffuse reflection PTFE material sintered at high temperature, with a reflectivity of up to 99%. It is suitable for the full spectral range from ultraviolet to visible to near-infrared (200–2500 nm) and exhibits excellent Lambertian characteristics within this range. Due to the high stability of the material, it is resistant to oxidation, yellowing, and deterioration, as well as waterproof and easy to store. The integrating sphere has an inner diameter of 36 mm, a sample port diameter of 9.5 mm; the incident port is an SMA905 collimated direct port, and the output port is a universal SMA905 interface, with optional customization for FC or other interfaces.

Transmittance Integrating Sphere Specifications:

2. Fiber Optic Spectrometer

The fiber optic spectrometer adopts a Hamamatsu cooled 2D CCD sensor, featuring high sensitivity, low noise, high signal-to-noise ratio, and low temperature drift. Operating wavelength range: 200–1100 nm; optical resolution: 1.83 nm @ 25 μm slit. By using cooling technology to suppress detector thermal noise, the dark current of the cooled fiber spectrometer is significantly reduced, and the signal-to-noise ratio is greatly improved. Cooling also lowers the detector temperature, reducing thermal noise and enabling detection of weaker optical signals. It is suitable for transmittance/reflectance, fluorescence, Raman, and other weak signal analysis applications.

Fiber Optic Spectrometer Specifications:

3. Deuterium-Halogen Combined Light Source

The Deuterium-Halogen combined light source integrates the advantages of a deuterium lamp (UV light source) and a halogen lamp (visible–near-infrared light source), providing continuous spectral output from UV to NIR (typically covering 190–2500 nm). It features a wide spectral range, high stability, and long service life. The standard output interface is SMA905/FC (optional). Both the deuterium lamp and halogen-tungsten lamp can be controlled independently to meet various testing needs. The Deuterium-Halogen combined light source can serve as a reference light source for absorbance, transmittance, and reflectance measurements, as well as for high-precision analytical instruments such as liquid chromatographs.

Deuterium-Halogen Combined Light Source Specifications:

4. Transmittance Integrating Sphere Stand

The transmittance integrating sphere stand is a widely used optical measurement accessory. The base is made of black metal, and the support rod is equipped with a mount for fixing the optical fiber through a collimating lens. The mount height can be adjusted via left/right screws and a rear screw to set the distance between the fiber and the integrating sphere.

Transmittance Integrating Sphere Stand Specifications:

5. Reflectance Integrating Sphere Stand

The reflectance integrating sphere stand is a commonly used optical measurement accessory. The base is solid and sturdy, with a fixed mount on the support rod to hold the reflectance integrating sphere. The mount secures the sphere by fastening its four base corners with screws. The center is hollow to allow the collimating lens to connect to the fiber. The sphere mount can be adjusted vertically.

Reflectance Integrating Sphere Stand Specifications:

6. Quartz Multimode Fiber

Quartz Multimode Fiber Specifications:

	SMA905			FC/PC

7. Transmittance & Reflectance Measurement System Diagram

Transmittance Measurement System Diagram ↑

Reflectance Measurement System Diagram ↑