| Products >> Spectroscopy / Educational Equipments >> Laser Raman Spectrometer |
Model No: HO-ED-S-06 |
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Laser Raman Spectrometer which we manufacture with commercial Model no: HO-ED-S-06 is primarily meant post graduate courses in Physics and Engineering, it can be used as a laboratory analyzing tool as well. |
| Principle |
Raman spectroscopy is a straightforward, non-destructive, analyzing technique requiring no sample preparation. It involves illumination of a sample with monochromatic light and examination of scattered light from the sample with a spectrometer.
When a light beam emitted by a laser device passes trough external optic path and irradiates the sample, the scattered light enters the monochromator. When the grating in the monochromator is rotated, light signal passes through a slit and falls on a highly sensitive detector(PMT). The detector out put is sent to computer for further processing, while a spectrum curve is being displayed on monitor.
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This experimental spectrometer is specifically designed for studying Raman emissions in CCl4 when high power green laser beam is passed through the solution. The apparatus suites well for post graduate level laboratory experiments in physics. The set up consists of 40mW DPSS laser, collection optics, sample mounts, stages, monochromator and detector. The monochromator is PC controlled and motorized. The experiment is conducted by scanning the emission spectrum by monochromator and recording the intensity of each interested wavelength from the detector. The readings are plotted on a graph.
The software developed for the instrument has facilities for setting up and calibration in addition to scanning and manual readout. The software saves and displays the data acquired on MS Excel sheet. |
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| Wavelength Range |
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200 ~ 800 nm |
| Wavelength Accuracy |
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< 0.4nm |
| Optical Grating |
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1200 l / mm |
| Slit Width |
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0 ~ 5 mm, continuously adjustable |
| Resolution of the slit |
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0.01mm |
| Notch Filter Wave length |
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532 nm |
| CWL Tolerance (nm) |
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+/- 5.3 nm |
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| Key features include |
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► Computer-controlled, user-friendly interface.
► Capable of automatic record of Raman spectra.
► DPSS laser is used as light source.
► Both solid and liquid samples can be analyzed.
► The system is assembled as a standalone unit
► With a footprint of 800 mm x 600mm.
► PMT along with associated electronics is used as detector.
► Both manual and automatic record of data possible. |
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| Irradiation Chamber |
Sample irradiation chamber consists of laser, sample holder, mirrors, lenses and other optics, all appropriately mounted on kinematic mounts and translation stages. Laser beam is directed in to the sample using plane mirrors and scattered light from the sample is collected using concave mirrors and condenser lenses. Polariser and half wave plates are also used on the optical path for polarization and depolarization studies. |
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| Spectrometer |
Input and output ports of the spectrometer are fitted with precise, micrometer controlled variable slits. The grating is fixed on rotation stage driven by stepper motor. Mirrors in the spectrometer are kinematically mounted for fine tuning during installation and setup. Notch filter for rejection of the laser wavelength is used at the output port for the protection of PMT. |
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| Control Electronics |
Prominent function of electronics in the system is to detect and amplify the signals from PMT. The data acquired and processed are transmitted to the computer using RS 232C interface. The electronics also include drives and controls for stepper motor used for rotary scan of the grating. Angular position of the grating and signals acquired by PMT are synchronized using a micro-controller. |
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| Software |
The software developed for the instrument has facilities for setting up and calibration in addition to scanning and manual readout. Scanning is possible for a desired wavelength range too. This feature can save time whenever full wavelength range scan is not necessary. The software also allows us to monitor real time output of PMT. This helps us to maximize coupling efficiency of the scattered light to the monochromator, while setting up. The software saves and displays the data acquired on MS Excel sheet. This helps to plot graph with ease whenever required. |
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| User can change the light source by removing the reflecting mirror and aligning an additional laser of the user’s choice, in to the optical path |
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