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.

Dispersive power of the material of the prism

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 q_n = nl

Where N is the the number of rulings in grating,

q_n 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.

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

Related Topics

Dispersion

Refractive index

Dispersive power

Angle of minimum deviation

Refraction Grating

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.

Optical Rail

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

Slit with Mount

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

Collimating Lens with Mount

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

Mercury Vapor Lamp with Power Supply

Model No: ED-S-01-MLPS
Input : 230V, 50 Hz
Quantity : 1 no.

Telescope

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

Hollow Prism

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

Equilateral Prism

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

Holographic Grating

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

Accessories

Allen Key
User Manual