Optical Microscopy and Mechanical Testing Laboratory

Phone : +91-3222-283244

Location : NB / GF / 8, CRF

Facilitator : Prof. Koushik Biswas, Metallurgical & Materials Engineering
Email: k_biswas@metal.iitkgp.ernet.in, Contact:+91-3222-283244



Objectives



 

Optical Image Analyzer Leica DMLM

This instrument was intended for use in metallurgical laboratories, particularly for quality control of steel cleanness and other microstructure measurement, but its usefulness in other fields soon became apparent. Early applications in the biological field were measuring the size of air spaces in the lung (to quantify lung damage) and counting silver grains in autoradiographs.

The universal illuminator is the heart of the Leica DM LM incident light microscope. The BF (brightfield, interference contrast, polari- sation), DF (darkfield) and Smith (quantitative polarisation) reflectors and the fluorescence filter systems are easily and conveniently switched with the 4-position turret plate.


 


 

UHL-VMHT (VICKERS MICROHARDNESS TESTER)

The new UHL VHMT not only has an exceptional new design, it makes micro hardness testing more convenient for the user than any other instrument:

 
  • 12 steps of test force yield more than the range       required by ASTM E-384/EN ISO 6507/EN ISO 4545.

  • Motorized selection of test force offers full control via touch panel display there is no mechanical dialing knob necessary.

  • Selectable approach velocity prevents bouncing effects on specific materials.

  • Focus finder helps to quickly determine the focal plane especially in case of highly polished samples.

  • The VMHT MOT offers a motorized turret and a touch panel display for more comprehensive information and interaction.

  • Due to the outstanding optics it can be used as a simple bright field metal microscope.


 

Universal Testing Machine

The objective of this laboratory is to introduce students to the tensile test and to evaluate a number of material properties relevant to the tensile test. Young's modulus E, which is one of two material properties that completely characterize the elasticity of any linear elastic isotropic material, will be determined. A second linear elastic isotropic material property, namely the shear modulus G, will be determined when the torsion experiment is performed later in the semester. Additional material properties, namely, (tensile) yield stress 3/4y and ultimate (tensile) stress 3/4u will also be evaluated.
 
 
 

People

Prof. Koushik Biswas
Facilitator
Metallurgical & Materials Engineering
k_biswas@metal.iitkgp.ernet.in
+91-3222-283244

Equipment Details

Optical Image Analyzer Leica DMLM

Equipment Name:       Optical Image Analyzer
Model Names:              A) Leica DMLM         B) Leica DMRX
Company Name:          Leica    (Made In Germany)

Manufacturer details:Leica

Purchase source (funding):Indian Institute of Technology, Kharagpur

Order No:619/IIT/PO/F/EQ-161/(A)/CRF/05 

Year of installation:August, 2006 

UHL-VMHT (VICKERS MICROHARDNESS TESTER)

Equipment Name:       Vickers Micro Hardness Tester

Capacity Range:        1 Gram Force to 2000 Gram Force                      
      

Model Name:            UHL VMHT          
      

Company Name:          Walter UHL   (Made In Germany)

Manufacturer details:Leica

Purchase source (funding):Indian Institute of Technology, Kharagpur

Order No:620/IIT/PO/F/EQ-161/(B)/CRF/05 

Year of installation:July, 2006 

Universal Testing Machine

Equipment Name:  Universal Testing Machine (Capacity: Maximum 48 KN)

Model Name:          H50KS

Company Name:    Tinius Olsen    (Made In United Kingdom)

Manufacturer details: Tinius Olsen

Purchase source (funding): Indian Institute of Technology, Kharagpur

Order No: 258/IIT/PO/F/EQ-179/(B)/CRF/2006 

Year of installation:  April, 2007 

Utility and Working Principal

Optical Image Analyzer Leica DMLM

What is Image Analysis?

Image Analysis is the science of making geometric and densitometic measurements on image from any source. Its main application is in quantitative microscopy, providing rapid, accurate and statistically significant data, replacing the traditional subjective methods.

Such measurements might be the volume fraction of various phases of an alloy or geological sample, the number and size distribution of contaminant particles filtered from air or hydraulic fluid, or the distribution of integrated optical density in the nuclei of stained cells.

Image Analysis first appeared as a readily available technique in 1963 with the introduction of the QTMA (Quantitative Television Microscope), designed by Metals Research Ltd., later to become part of Leica. This instrument was intended for use in metallurgical laboratories, particularly for quality control of steel cleanness and other microstructure measurement, but its usefulness in other fields soon became apparent. Early applications in the biological field were measuring the size of air spaces in the lung (to quantify lung damage) and counting silver grains in autoradiographs.

Since then, the techniques of image analysis have been applied in almost every field of science and technology from Anatomy through to Zoology, and have expanded to include image processing functions such as image filtering and enhancement.

What is Leica QWin?
QWin is Leica's Image Processing and Analysis toolkit running under the industry standard Microsoft Windows environment.
Note : If you are new to the windows operating system then we recommend that you learn the use of the Windows environment before attempting to use QWin.

Leica QWin provides several classes of measurement ranging from interactive manual measurement of objects to fully automated 'Hands-off' analysis. Examples are :

 
  • Planimetry of Length, Distance and Area
  • Phase percent, Area Fraction and Volume Fraction
  • Calibrated Densitometry
  • Particle shape and size analysis


 

UHL-VMHT (VICKERS MICROHARDNESS TESTER)

The denotation "Micro hardness" derives from the field of hardness determination by means of an indenter entering the material to be tested with a specific load and dwell time. After removing the indenter, the produced imprint is measured and the "hardness number" calculated.
 
 
 


Sample Details

sample output of Optical Image Analyzer Leica DMLM

sample output of UHL-VMHT (VICKERS MICROHARDNESS TESTER)

 

Imprints of Indenter

Image is shown directly on the touch-display



Lights
sample output of Optical Image Analyzer Leica DMLM
Lights
Imprints of Indenter
Lights
Image is shown directly on the touch-display

List of Laboratories