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.

Basic System Features
◆ 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. 

◆ High stability light source, reducing the background noise.
Though the modulation method could reduce the impact of stray light and the background noise on the measurement, the fluctuation of light source is still impossible to eliminate. So in the system designed in modulation, the stability of light source is the main source for system noise.  DSR100 adopt the high stability light source to keep the system high repeatability. The stability data for light source relative intensity ( As shown below) .

◆ Large space sample chamber and removable walls to     facilitate system debugging The removable walls of the large space sample chamber give a large enough space for the experimenter to install the sample detector and debug. At the same time, the large space sample chamber with removable walls also could hold more special shape detectors, such as liquid nitrogen refrigeration detector, streak tube and so on.

◆ Automatic measurement process
★High repeatability for the automatic measurement process.
The measurement repeatability is largely determined by repeat positioning accuracy. Motorized Stage repeat positioning accuracy is less than 10μm, its accuracy is much higher than   sample location in manual.
★Easy measurement processes
The user could take testing easily just according to the software prompts without complex training. That is very suitable for industrial customers to do detection.
★Improve the working efficiency
After you set the testing Plan, the system will run the Plan automatically, which can improve the user working efficiency. 

◆ CCD monitoring optical path. The detectors with very small     area can be located precisely by the system.  For the devices installed in the Array Detector in the future, its photosensitive surface is often much small. Especially some detectors will be installed in the Dewar. The accuracy of locating the spot on the photosensitive surface can not be guaranteed by visual alignment. There is no repeatability for that visual alignment. But for the CCD monitoring optical path, the location is very precise by CCD visually monitoring and that has a very high repeatability.

◆ Data export format supports third- party software.
DSR100 can save all original data, and the experimenter can save the data as the *.txt, *. xls. 
◆ High repeatability light source reducing the impact of background noise.

◆ Accessories