Measurement of refractive index of infrared window, infrared lens, chalcogenide glass
Based on the minimum deviation method (Fraunhofer method),monochromatic light of arbitrary wavelength (1 to 14µm）is irrdiated to a prism shaped sample, and the angle of transmitted light with respect to incident light is measured to measure the refractive index of the sample. The newly deve
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NRI series IR Refractive Index Measurement System 〉
A4／2pages／1.79MB
Features
- High precision measurement of the refractive index (0.0001) is possible in the wavelength range 1 to 14µm
- Equipped with a temperature control function, the system can measure the difference i refractive index with temperature.
Measurement Items
Measurement Data
Block Diagram
Measurement Principle
Specifications
| Measurenment method | Monimum deviation ( Draunhofer method ) |
| Measurement Items | Refractive index, Apex angle ・Changes in refractive index by wavelength(dn/dλ） ・Changes in refractive index by sample temperature(dn/dT） |
| Refractive index measurement range | 1～4 |
| Measurement precision | 0.0001（1×10-4） |
| Measurement wavelength range | 1～14μm |
| Irrdiation wavelength range | 400nm～20µm*1 |
| Temperature control range | -40～80℃*2 |
| Irrdiation size | approx.Φ8mm |
| Measurement functions | Apex angle, Determination of minimum deviation position, Refractive index |
| Measurement mode | 1point measurement, WL dependence, Temperature denpendence |
| Setting parameters | Wavelength, Temperature, Expected refractive index |
| Saving format | Text format ( CSV format ) |
*1 In order to perform measurement in 14 to 20µm, it is necessary to add a higher order light cut filter.
*2 Due to the set temperature of the temperature controller, it may differ depending on the measurement sample.
Standara Configuration
- Caramic heater light source
- Halogen lamp light source
- Helium lamp（ｄ line 587.56nm）
- Light source converging system
- Monochromator and gratings
- Irrdiation optical system
- Laser for apex angle measurement
- Rotating stage and controller
- Sample holder
- Temperature control stage and controller
- Lock-in amplifer
- Sample compartment and frame
- Detector
- General controller
- Software
- Control PC
Option
- Color filter
- ND filter
- Various stage for back electrode type sample, DSC sample stage and etc.
Utilities
- Main unit：Approx.W1800×Ｄ900×H1800mm
＊Excluding PC and rack＊
