Quantum efficiency testers typically use a monochromatic light source as the incident light, with a narrow spectral width that is generally much smaller than the absorption spectral width of the device being tested. The light emitted by the light source passes through a carefully designed optical path system, which includes components such as an optical homogenizer to ensure that the beam can be collimated and uniformly irradiated on the surface of the device under test. This design helps reduce measurement errors caused by uneven lighting.

During the measurement process, it is necessary to simultaneously use a reference sample with known quantum efficiency and the sample to be tested. The instrument will first irradiate the reference sample with monochromatic light and record the generated electrical signal (such as current); Then maintain the same lighting conditions and measure the electrical signal response of the test sample. By comparing the signal strengths of the two, the quantum efficiency data of the device under test can be calculated.

The instrument is equipped with a high-resolution detector and a low-noise preamplifier circuit for accurately capturing and amplifying weak electrical signals generated by photon excitation. Subsequently, these signals are processed through complex data processing algorithms to eliminate background noise and other interference factors, thereby obtaining accurate quantum efficiency values.

In order to evaluate the photoelectric conversion performance of the device at different wavelengths, the quantum efficiency tester also performs multi wavelength scanning. By sequentially changing the wavelength of monochromatic light and repeating the above measurement process, a complete spectral response curve can be drawn.

Precautions for using quantum efficiency tester:

1. Safety protection

-Personal protective equipment: Wear protective gloves, masks, and goggles before operation to prevent direct laser exposure to the eyes or contact with harmful chemicals.

-Environmental isolation: Keep the work area well ventilated and away from flammable materials, especially when dealing with high-power light sources, be alert to the risk of overheating.

2. Equipment maintenance

-Regular cleaning: Use a dry and dust-free cloth to wipe optical components (such as lenses and filters) to avoid fingerprint residue; The fixture can be cleaned with neutral detergent and dried.

-Connection line inspection: Regularly check for cable wear and loose joints, and replace aging components in a timely manner to ensure signal transmission stability.

-Lens protection: It is strictly prohibited to touch the surface of the lens directly with your hands. Use a special blowing balloon to remove particles and prevent scratches from affecting the transmittance.

3. Operating standards

-Avoid vibration interference: Reduce the mechanical vibration sources of surrounding equipment during the testing process to prevent measurement deviation caused by micro motion of the optical platform.

-Temperature control: For temperature sensitive samples, it is recommended to equip a temperature control module to maintain a constant ambient temperature and eliminate the influence of thermal drift on the results.

-Electromagnetic shielding: When working in a strong electromagnetic interference environment, shielding measures should be taken to prevent stray fields from coupling into the circuit system.

4. Calibration management

-Cross validation: Using multiple methods (such as combining absolute and relative methods) to verify the reliability of key data.

5. Emergency response

-Abnormal shutdown: In case of sudden power outage or other situations, immediately save the current progress and turn off the power. After recovery, resume testing from the breakpoint instead of restarting the entire process.

-Troubleshooting: When an abnormal alarm occurs, priority should be given to referring to the diagnostic guide in the operation manual, and do not blindly disassemble the core components.