DSR100 Detector Responsivity Measurement System DSR100 Detector Responsivity Measurement System introduction Photodetector is the sensor that could convert the optical radiation signal to the electrical signal, which is made from photoemission material. Most of the photodetectors have strong spectral selectivity in a certain Spectrum area. Therefore, for one photodetector, different wavelengths have different spectral responsivity. The spectral responsivity is an important parameter index for characterizing the photodetector performance. And for the photoelectric material researching , the effect of some characteristics of the material itself such as doping density, lattice imperfection, absorption coefficient and minority carrier diffusion length on the photoelectric response capacity and the quantum efficiency could be obtained by measuring and analyzing the spectral responsivity data. That is very important and helpful for choosing better material and processing improvement.
The naissance of the DSR100 Detector Responsivity Measurement System is to meet the growing materials science demand for measurement equipment. The DSR100 combines the characteristic and experience from several customized Detector Responsivity Measurement System which customize by several research institutes from ZOLIX. And it uses the national standard measurement methods for testing. It is the indispensable equipment for photoelectric conversion materials and optical devices researching.
Wide wavelength range ( 200~2500nm, or 1~14µm optional), widely applicable. A wide spectral range means that this DSR100 could be used for a variety of different detectors, such as the DUV detector responding to the Solar-blind Region, solar cell responding to the visible light, optical fiber sensor responding to the NIR, infrared photoelectric sensor responding to the FIR, all of the above detectors spectral response could be measured by the DSR100 expediently. A Turnkey system, Easy maintenance.The system uses substitution method of measuring principle, which is designed into Turnkey mode. Users do not need to debug the system before experiments. Routine maintenance is also very simple.
The substitution method has been adopted as the spectral responsivity measurement standard method by the National Measurement Unit. Compared with the conventional detection methods, the substitution method is simple and has high accuracy for the system, avoiding systematic errors. For the substitution method detector system, the user just need to calibrate the Standard detector regularly. But for the conventional detector system, all of the parts of the system need to be calibrated, including the light sourcing, monochromator, all of the optical component, that means the user have to split the system. modulation method measurement, enhancing the SN( signal to noise) of the measurement results
DSR100 adopts the modulation method measurement technique. The modulation method is the standard method adopted by the National Measurement Unit. The Stray light and noise do impact on the measurement accuracy, which could be decreased by Frequency-selective amplification technique. The unique pre-amplifier circuit was specifically designed for the weak signal acquisition, and the lock-in amplifier was adopted for the modulation method measurement. The sensitivity of the lock-in amplifier reaches to 2nV, and the dynamic range is 100 dB of lock-in amplifier.
Through improving the measuring sensitivity and restraining noise, the DSR100 can pick up very weak Detector Responsivity signal from the background noise.
Perfect reflection optical design, optimization of spot quality Different photodetectors have different spectrum response range, so the perfect Detector Responsivity Measurement System has the wide spectral range and can be widely used for different photodetectors. The system designed in perfect reflection optical has better beam quality and spot uniformity than the system with transmission optical design. In the transmission optical system, one of the important factors that determine the beam quality and spot uniformity is chromatism which originates in different wavelengths of monochromatic light having different refractivity for the optical material. And the wider spectral range , the more obvious the chromatism is. But in the perfect reflection optical system, it is not base on the refraction, there is no chromatism problem. So in the perfect reflection optical system, you can get the quality parallel spot or much small convergency spot.
DSR100UV-A
DSR100UV-B
DSR100IR-A
DSR100IR-B
Wavelength coverage
200~2500nm
1~14µm
Spot
Spot mode
parallel spot
Convergent spot
parallel spot
Convergent spot
Spot size
?2~20nm
?0.3~3nm
?2~20nm
?0.3~3nm
Light source
source
Deuterium & Tungsten-Halogen source
SiC & Tungsten-Halogen source
Stability
= 0.8%
= 2%
Switch
Automatically by software
Automatically by software
Monochromator
Resolution
<0.1nm(435.8nm@1200g/mm)
<2.5nm(2615nm@75g/mm)
Minimum step
0.005 nm
Output bandwidth
<5nm
<10nm
Filter
According to the wavelength, the software will choose corresponding filter to reduce the multiple order spectral stray light.
Optical modulation frequency
4~400Hz
Data acquisition system sensitivity
2nV ( lock-in amplifier), direct current data acquisition as option.
Standard detector
Si detector(Calibration 200~1100nm)
Pyroelectric detector (Calibration 1~14µm)
Repeatability
= ±1.5%
= ±5%
Optical axis height
305nm
Dimension
1500 mm X 1200 mm X 560 mm
Control Cabinet
Standard 4 U control cabinet including computer
Accessories
Partnumber
Description
Remark
DSR-A1
Standard Si detector, photosurface: ?11.3nm, 200~1100(Calibration )
DSR-A2
Standard InGaAs detector, photosurface: ?3nm, 800~2500nm( Calibration)
DSR-A3
Standard Pyroelectric detector, photosurface: 05mmX2mm, 1~14µm(Calibration)
DSR-B1
Small lighting source used in indoors for illumination.
DSR-B2
532nm Laser, monitoring optical path, CCD, used for the location of the spot on the photosensitive surface
Use together with DSR-B1.
DSR-C1
Used for the bias voltage up to 1800V.
DSR-C2
Switch to the preamplifier for the output signal
DSR-F1
Samper holder used for the small photosurface sample.
Included in the system
DSR-F2
Three-dimension sample holder (adjustable in front and rear, rotate, lift).
DSR-F3
Dewar holder used for the liquid nitrogen cooled detector.
OTPOT-1512
High precision optical table, 1500mm X 1200mm X800mm
