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Spectrometer - Goniometer

Model: HO-ED-S-01

Spectrometer-Goniometer (Model No. HO-ED-S-01) is a versatile instrument for studying the spectrum of different light sources as well as for characterization of components like prisms and gratings. Unlike common spectrometers, this model is designed in such a way that students get better understanding of the working principles of spectrometer. All modules are deliberately made open and easy to understand. Students gain hands on experience in the basics of spectroscopy.

This Goniometer is used for measuring optical data of prisms. It offers precise angle and refractive index measurements. The well designed mechanics of the Goniometer allows maintenance-free operation over many years. Conventionally, the measurement of refractive index is carried out with a dispersion prism made from the material to be tested. For the measurement of refractive index of fluids, a hollow prism, which is filled with the fluid is used. It can also be used as a spectroscope for qualitative examination and measurement of emission and absorption spectra.



Experiment Examples

    Determination of refractive index of the solid prism

The refractive index of the solid prism using the formula,


n    =    sin  ( (α+β) / 2 )   /   sin (α/2)


Where α is angle of the prism & β is angle of minimum deviation.


    Dispersive power of the material of the prism

Dispersive power,

ω = (n2- n1) / (n - 1)

where,

n1 and n2 are the refractive indices of the prism for any two colours, and n = (n1 + n2 ) / 2



    Refractive index of various liquids using liquid prism

Replace the solid prism with hollow prism containing the liquid for which the refractive index to be calculated.
The experimental procedure is same as solid prism.



    Determination of wavelength of prominent lines of mercury using grating

If a parallel beam of monochromatic light is incident normally on the face of a plane transmission diffraction grating, bright diffraction maxima are observed on the other side of the grating. These diffraction maxima satisfy the grating condition:


N sin qn = nl


Where N is the the number of rulings in grating,

qn is the angle of diffraction of the nth maximum.

n is the order of spectrum which can take values 0, ±1, ±2, ±3 …….

l is the wavelength of the incident light.


Related Topics

    Dispersion

    Refractive index

    Dispersive power

    Angle of minimum deviation

    Refraction Grating
Specifications

    Inspection Telescope Magnification : 10 x

    Resolution of Prism Table : 10 arc minute

    Resolution of Stage : 1 arc minute

    Variable slit : Micrometer controlled, continuously variable 0 - 3mm
Features

    Modern and user friendly design

    Mercury lamp is used as light source

    Symmetrical precision slit
    Height of prism table is adjustable

    High-quality optics

    Comprehensive manual Included
Scope of Supply


    Goniometer

Model No: ED-S-01-G
Resolution of prism table
:
10 arc min
Resolution of stage
:
1 arc min
Quantity
:
1 no.
Goniometer

    Optical Rail

Model No: ED-S-01-OR
Length
:
500 mm
Material
:
Black anodized Aluminum alloy
Quantity
:
1 no.
Optical Rail

    Slit with Mount

Model No: ED-S-01-SM
Controlling
:
Lead screw
Slit Size
:
0 - 3mm
Quantity
:
1 no.
Slit with Mount

    Collimating Lens with Mount

Model No: ED-S-01-CLM
Material
:
N-BK7
Focal length
:
202 mm
Diameter
:
50 mm
Quantity
:
1 no.
Collimating Lens with Mount

    Mercury Vapor Lamp with Power Supply

Model No: ED-S-01-MLPS
Input
:
230V, 50 Hz
Quantity
:
1 no.
Mercury Vapor Lamp with Power Supply

    Telescope

Model No: ED-S-01-T
Magnification
:
10 X
Quantity
:
1 no.
Telescope

    Hollow Prism

Model No: ED-S-01-HP
Material
:
PMMA
Quantity
:
1 no.
Hollow Prism

    Equilateral Prism

Model No: ED-S-01-EP
Material
:
N-SF1
Quantity
:
1 no.
Equilateral Prism

    Holographic Grating

Model No: ED-S-01-HG
Groove spacing
:
1200 lines / mm
Size
:
50 x 50 mm
Quantity
:
1 no.
Holographic Grating

    Accessories

Allen Key
User Manual

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