Nunes Instruments

Nano physics instruments are specialized tools and devices used to study, manipulate, and measure physical phenomena at the nanoscale (typically in the range of 1 to 100 nanometers). These instruments play a crucial role in fields like nanotechnology, materials science, electronics, biology, and quantum mechanics. At this scale, unique physical properties such as quantum effects, surface area dominance, and atomic interactions become more pronounced, making advanced tools essential for analysis and experimentation.

• Nanoscale measurement
• Scanning Electron Microscope (SEM)
• Transmission Electron Microscope (TEM)
• Atomic Force Microscope (AFM)
• Scanning Tunneling Microscope (STM)
• X-ray Diffraction (XRD)
• Nanoindenter
• Nanoparticle Tracking Analysis (NTA)
• Focused Ion Beam (FIB)
• Nanoparticle characterization
• Dynamic Light Scattering (DLS)
• Zeta potential measurement
• Quartz Crystal Microbalance (QCM)
• Near-field Scanning Optical Microscope (NSOM)
• Raman Spectroscopy
• Nanomaterials analysis
• Quantum effects
• Surface morphology
• Nanofabrication
• Nanostructure imaging
• Nanoparticles
• Nanomechanical properties
• Molecular interactions
• Thin films
• Semiconductor analysis
• Nanoscale research
• Biological molecule analysis
• Quantum physics tools
• Nanoelectronics
• Surface science
• Scanning Electron Microscope (SEM)
• Transmission Electron Microscope (TEM)
• Atomic Force Microscope (AFM)
• Scanning Tunneling Microscope (STM)
• X-ray Diffraction (XRD)
• Nanoindenter
• Nanoparticle Tracking Analysis (NTA)
• Focused Ion Beam (FIB)
• Nanoparticle characterization
• Dynamic Light Scattering (DLS)
• Zeta potential measurement
• Quartz Crystal Microbalance (QCM)
• Near-field Scanning Optical Microscope (NSOM)
• Raman Spectroscopy
• Nanomaterials
• Nanoscale fabrication
• Quantum research
• Thin film deposition
• Nanotechnology
• Surface analysis
• Nanophotonics
• Molecular imaging
• Brownian motion tracking
• Mechanical properties at nanoscale
• Colloidal stability

 

 

The characterization of single mode and multi mode fiber can be performed bythis experiment setup. The set up contains optical rail & carriers system formounting & adjusting optical components required for experiments. Laser diodeused as a source of light & light coupled to fiber by using objective lens on fibercoupled setup. The coupling efficiency monitor with photo detector detecting thelight coming out from end of fiber. The output ends is hold by mount and detectorhold on translation stage.This setup helps to understand concept of numerical aperture, coupling of lightand bending loss etc. Numerical aperture can be calculated by output light ofoptical fiber using photo detector or white screen mounted on translation stage.All components of setup constructed by corrosion resistant materials likestainless steel and aluminum alloy.

Product Description* Constant current source,* Digital milli-ammeter 0-20mA,* Digital milli-voltmeter 0-200mV & Copper coil with glass enclosure,* Digital thermometer,* Electric kettle & Stand

Highly accurate results

• Precise measurement of

Band-Gap

• Clear physical interpretation

• Self contained unit with no

extra accessory required

Several proposals to measure the Planck’s Constant for didactical purposes, using the current –

voltage (I-V) characteristics of a light emitting diode (LED) have been made quite regularly in the

last few years. The reason is that the experiment can be done easily in any lab and the result are

surprisingly good (±10%). The physical interpretation however is not completely clear and this

has raised many discussions, which has been published almost with same regularity as the

proposals themselves.

The present experiment is based on diode current for V<Vo , using the diode law.

I = Io exp [- e (Vo – V)/hkT]

where, e is electronic charge, k is Boltzmann constant, T is absolute temperature and h is

material constant which depends on the type of diode, the location of recombination region,

etc.

 

h = (e/kt) (DV/Dln I)

 

Compared with previous methods, this determination of Vo is more precise and more

accurate and at the same time the physical interpretation is more transparent.

The Planck’s constant is then obtained by the relation

h = e Vo l/c

The wavelength (l) of the light emitted by the diode can be measured by a transmission grating

spectrometer normally available in the lab.

The value of Planck’s constant obtained from this method is within 5% of accepted value

(6.62x10-34 Joules.sec)
Experimental Set-Up

It is a self contained unit. All the necessary facilities and measuring devices are built in a single unit, as a

result only minimum of external connections need to be made.
[I] Dependence of current (I) on temperature (T) at constant applied voltage (V)

(a) Current Meter

A highly stable current meter with 31⁄2 digit display

Range: 0-2mA with resolution of 1 A

(b) Oven

It is a small temperature controlled oven with built-in RTD sensor. The temperature is adjustable from

ambient to 65°C and displayed on 31⁄2 digit panel meter. The stability of temperature is ± 0.2°C.

(c) Voltmeter

A high stability voltage source with 31⁄2 digit display
[II] Material Constant h

To draw I-V characteristics of LED for determination of h, a variable voltage source and current

meter are provided with 31⁄2 digit display.
[III] The wavelength l of light emitted by LED
These are taken from LED datasheet or as measured by transmission grating are provided with the set of LED’sz

Product DescriptionSpecifications:

• General: This Kelvin Double Bridge is very suitable for the use of wires and cables manufactures
• It is being extensively used for finding the reistance of transformer windings, Contact resistance of relays etc
• Standard Resistance: There are 10 coils of 0.01 Ohm each arranged on a rotary dial plus a circular slidewire of total resistance 0.01 Ohm and 500 sub-division
• Each sub-division is equal to 0.00002 Ohms on the normal range
• Multiplying Ratio: A rotary switch furnishes 5 multiplying ratios of x 100, x 10, x 1, x 0.1 And x 0.01
• Range of Measurement The bridge has a range of 0.2 micro ohm to 11 ohms

Nunes Instruments , is  in the field of Instrumentation Sales Service & Repairs with 40 years of experience.  We provide service & repairs to your old high precision instruments and equipment.  We provide cost effective service & Repair to any brand, any make instruments  with service warranty. W hy not try once?

Instruments of Any Type, Any Make, Analog/Digital, Any Condition  Indian or  Imported

 

• Laboratory Instrument, Test Equipment,
• Scientific, Measuring, Precision Instrument,
• Analytical, Bio Medical, Survey, Electrical,
• Electronic Instruments ,Weather, Metrology.

An astronomical telescope mirror, often referred to as the primary mirror, is the foundational optical element in a reflecting telescope. Its primary function is to collect faint light from distant celestial objects and precisely focus it to form a clear, magnified image. These mirrors are meticulously crafted from high-quality optical glass or specialized glass-ceramics, featuring a precisely shaped, highly reflective surface. This critical component dictates a telescope's light-gathering power and image resolution, making it essential for both amateur stargazers and professional astronomers.

Key Features (6 points):

1. High Light-Gathering Power: The primary mirror's size (aperture) directly determines its ability to collect more light, allowing for observation of fainter and more distant celestial objects.
2. Precise Parabolic/Spherical Shape: Mirrors are meticulously ground and polished to a specific concave shape (typically parabolic for larger mirrors to correct for spherical aberration, or spherical for smaller, slower mirrors) to ensure light rays converge at a single, sharp focal point.
3. Highly Reflective Coating: The front surface is coated with a thin layer of highly reflective material, such as aluminum, often with a protective overcoat (e.g., silicon dioxide) to maximize light reflection and durability.
4. Minimizes Chromatic Aberration: Unlike lenses, mirrors do not suffer from chromatic aberration (color fringing), leading to sharper, truer-color images.
5. Quality Substrate Material: Constructed from materials like borosilicate glass (Pyrex), fused silica, or advanced glass-ceramics (e.g., Zerodur) that offer high optical quality, low thermal expansion, and stability.
6. Various Sizes and Focal Lengths: Available in a range of diameters and focal lengths to suit different telescope designs (e.g., Newtonian, Cassegrain) and observational preferences (e.g., wide-field deep-sky vs. high-magnification planetary).

Precision Measurement for Pulp & Paper Consistency

The V-Tech Paper Consistency Apparatus is a highly reliable instrument designed to measure the consistency of pulp suspensions in paper manufacturing. It ensures accurate results, helping industries maintain optimal fiber concentration for improved production efficiency and quality control.

Key Features:

• High-precision measurement for accurate pulp consistency analysis.
• Sturdy and corrosion-resistant construction for long-lasting durability.
• Easy-to-use design with a simple and efficient testing process.
• Suitable for various pulp types, including chemical, mechanical, and recycled pulp.
• Essential for maintaining consistency in paper manufacturing and processing.

Exp-1 To demonstrate Young's fringes.Exp-2 To demonstrate diffraction pattern by pinhole, single slit, double slit & grating.Exp-3 To demonstrate Fresnel's diffraction.Exp-4 To determine the slit or pinhole width.Exp-5 Light spreads when passed through a narrow aperture.Exp-6 To measure wavelength using a millimeter scale as a grating.PHYSICS, Class XII, Part - 2 ,Chapter-10, Wave optics.The kit has been designed to perform a lot of experiment related to the lightexperiments to nd out the wavelength of the light, width of the narrow slit orany type of pattern.