Skip to main content

Dipen Sinha

Los Alamos National Laboratory, MPA-11, Emeritus

Followers

5

Following

2

Co-author

1

Public Views

I am an experimental physicist with 45 years research experience in the fields of ultrasonics and acoustic NDE techniques, ultrasonic sensors, material characterization techniques, acoustically engineered materials, low temperature physics, infrared detector arrays, femtosecond lasers, ultra high-speed electrical measurements, nuclear detectors, high temperature superconductors, organic thin film sensors, thermionic integrated circuits, and chemical and biological sensors. I am currently involved in solving various technical problems for government and industry with particular emphasis on developing novel sensors and instrumentation that can be adapted for a wide range of applications. Involved in developing sensors for the energy industry.
Address: MPA-11, D429
Los Alamos National Laboratory
Los Alamos, NM 87545

less

Arizona State University

University of Cagliari

Case Western Reserve University

Dineshkumar Harursampath

Indian Institute of Science

Durham University

Virginie Boucher

CSIC (Consejo Superior de Investigaciones Científicas-Spanish National Research Council)

Monish Chatterjee

University of Dayton

Metalurgi Fisik (Physical Metallurgy) Reza Fadhila

State University of Medan

Osama El Hariri

Banha University At Egypt

University of Birmingham

Interests

Uploads

Papers by Dipen Sinha

Multi-frequency electrical impedance tomography

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information), Apr 5, 2022

Maximum supercoolign in liquid /sup 3/He-/sup 4/He mixtures near the tricritical point

Measurements of supercooling in liquid /sup 3/He-/sup 4/He mixtures near the tricritical point ar... more Measurements of supercooling in liquid /sup 3/He-/sup 4/He mixtures near the tricritical point are presented. The reduced temperature range 0.001 < epsilon identical to (1 - T/T/sub t/) < 0.01 was investigated for three different rates of cooling using a pressure-quench technique. For epsilon < 0.012, the maximum supercooling was found to be a function of the cooling rate. Comparisons with data in organic binary mixtures are given.

Elastic properties of fluids : liquids and gases

Transiient Measurements of Ultrafastchargecollectionin Semicouductor Diodes

Funneling-current transientsproducedin semiconductordevicesare predictedto occur on a picosecond ... more Funneling-current transientsproducedin semiconductordevicesare predictedto occur on a picosecond timescale.We havemeasuredthesetransientsusinga highbandwidthsamplingsystem. Measurements were madeon 1, 3, and10 Q-cm siliconlowcapacitance diodesand 1016cn-3Te.-dopedGaAs diodes. The data is comparedto theHsieh,MurleyandO'Brien,the McLean and Oldham,and the Messenger models. Risetime versus dopingdensity,peakcurrent,totalcharge,and amplitudeversus biaswere measured. Also, current transientsandpromptchargeversus energy are presented.

Conductivity of polystyrene film upon exposure to nitrogen dioxide: a novel NO2 sensor

Sensors and Actuators B: Chemical, 1993

A novel NO2 sensing device has been developed based on a reversible change in d.c. conductivity i... more A novel NO2 sensing device has been developed based on a reversible change in d.c. conductivity in an otherwise insulating film of polystyrene upon exposure to NO, gas. The device consists of a polystyrene film-coated interdigitated electrode, for which several orders of magnitude increase in conductivity occurs when an NO,/N, mixture, I:10 v/v, comes into contact with the film. This rapid (2 min) change in conductivity is reversible and is not associated with any irreversible decomposition of the film. The conductivity of the film is believed to be due to the self-ionization of N,O,, the form of NO, within the film, to NOfN03-, with the appropriate anodic and cathodic electrochemistry; it is therefore extremely selective for NOz.

Study of dynamical light scattering in phase separating 3He–4He mixtures using linear photodiode arrays

Review of Scientific Instruments, 1984

Experimental techniques to study dynamical light scattering phenomena in phase separating 3He–4He... more Experimental techniques to study dynamical light scattering phenomena in phase separating 3He–4He liquid mixtures are described. Commercially available self-scanning 512-element linear photodiode arrays are used to record ‘‘snapshots’’ of small-angle light scattering patterns with high angular resolution at time intervals as short as 2 ms. Logic circuitry developed for interfacing the photodiode arrays with a digital oscilloscope recorder is described in detail.

Quantitative measurements of light scattering in decomposing 3He4He liquid mixtures

Physica B+C, 1981

ABSTRACT

Gas separation using ultrasound and light absorption

Apparatus and method for remote, noninvasive characterization of structures and fluids inside containers

Non-invasive fluid density and viscosity measurement

Nitrogen dioxide detection

Microwave determination of location and speed of an object inside a pipe

Method for establishing the presence of salmonella bacteria in eggs

Method for noninvasive intracranial pressure measurement

Non-Invasive Characterization Of A Flowing Multi-Phase Fluid Using Ultrasonic Interferometry

A superlattice strain gage

23rd Joint Propulsion Conference, 1987

ABSTRACT

Preface for Volume 4

Handbook of Elastic Properties of Solids, Liquids, and Gases, 2001

Non-contact fluid characterization in containers using ultrasonic waves

Apparatus and method for non-contact (stand-off) ultrasonic determination of certain characterist... more Apparatus and method for non-contact (stand-off) ultrasonic determination of certain characteristics of fluids in containers or pipes are described. A combination of swept frequency acoustic interferometry (SFAI), wide-bandwidth, air-coupled acoustic transducers, narrowband frequency data acquisition, and data conversion from the frequency domain to the time domain, if required, permits meaningful information to be extracted from such fluids.

Bismuth magnetoresistive thermometry for transient temperature measurements in liquid helium

Review of Scientific Instruments, 1981

We have developed a thermometric technique adapted from our work on the galvanomagnetic effects i... more We have developed a thermometric technique adapted from our work on the galvanomagnetic effects in bismuth at liquid helium temperatures. We find that a single crystal of bismuth can be used effectively as a thermometer for transient temperature measurements at these low temperatures. The thermometric property which is exploited is the strongly temperature-dependent magnetoresistance exhibited by these crystals at liquid helium temperatures. The bismuth thermometer is characterized by a fast thermal response, good sensitivity, low Kapitza resistance, and ease of electrical resistance adjustment, and it is particularly well suited to the situation in which the thermometer is itself used as a heater. In earlier work we successfully used these properties to study transient heat transfer from bismuth into liquid helium I and to measure the homogeneous nucleation temperature of liquid helium I.

Noninvasive method for determining the liquid level and density inside of a container

Disclosed is a noninvasive method for determining the liquid level and density inside of a contai... more Disclosed is a noninvasive method for determining the liquid level and density inside of a container having arbitrary dimension and shape. By generating a flexural acoustic wave in the container shell and measuring the phase difference of the detected flexural wave from that of the originally generated wave a small distance from the generated wave, while moving the generation and detection means through the liquid/vapor interface, this interface can be detected. Both the wave generation and wave detection may be achieved by transducers on the surface of the container. A change in the phase difference over the outer surface of the vessel signifies that a liquid/vapor interface has been crossed, while the magnitude of the phase difference can be related to fluid density immediately opposite the measurement position on the surface of the vessel.

Multi-frequency electrical impedance tomography

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information), Apr 5, 2022

Maximum supercoolign in liquid /sup 3/He-/sup 4/He mixtures near the tricritical point

Measurements of supercooling in liquid /sup 3/He-/sup 4/He mixtures near the tricritical point ar... more Measurements of supercooling in liquid /sup 3/He-/sup 4/He mixtures near the tricritical point are presented. The reduced temperature range 0.001 < epsilon identical to (1 - T/T/sub t/) < 0.01 was investigated for three different rates of cooling using a pressure-quench technique. For epsilon < 0.012, the maximum supercooling was found to be a function of the cooling rate. Comparisons with data in organic binary mixtures are given.

Elastic properties of fluids : liquids and gases

Transiient Measurements of Ultrafastchargecollectionin Semicouductor Diodes

Funneling-current transientsproducedin semiconductordevicesare predictedto occur on a picosecond ... more Funneling-current transientsproducedin semiconductordevicesare predictedto occur on a picosecond timescale.We havemeasuredthesetransientsusinga highbandwidthsamplingsystem. Measurements were madeon 1, 3, and10 Q-cm siliconlowcapacitance diodesand 1016cn-3Te.-dopedGaAs diodes. The data is comparedto theHsieh,MurleyandO'Brien,the McLean and Oldham,and the Messenger models. Risetime versus dopingdensity,peakcurrent,totalcharge,and amplitudeversus biaswere measured. Also, current transientsandpromptchargeversus energy are presented.

Conductivity of polystyrene film upon exposure to nitrogen dioxide: a novel NO2 sensor

Sensors and Actuators B: Chemical, 1993

A novel NO2 sensing device has been developed based on a reversible change in d.c. conductivity i... more A novel NO2 sensing device has been developed based on a reversible change in d.c. conductivity in an otherwise insulating film of polystyrene upon exposure to NO, gas. The device consists of a polystyrene film-coated interdigitated electrode, for which several orders of magnitude increase in conductivity occurs when an NO,/N, mixture, I:10 v/v, comes into contact with the film. This rapid (2 min) change in conductivity is reversible and is not associated with any irreversible decomposition of the film. The conductivity of the film is believed to be due to the self-ionization of N,O,, the form of NO, within the film, to NOfN03-, with the appropriate anodic and cathodic electrochemistry; it is therefore extremely selective for NOz.

Study of dynamical light scattering in phase separating 3He–4He mixtures using linear photodiode arrays

Review of Scientific Instruments, 1984

Experimental techniques to study dynamical light scattering phenomena in phase separating 3He–4He... more Experimental techniques to study dynamical light scattering phenomena in phase separating 3He–4He liquid mixtures are described. Commercially available self-scanning 512-element linear photodiode arrays are used to record ‘‘snapshots’’ of small-angle light scattering patterns with high angular resolution at time intervals as short as 2 ms. Logic circuitry developed for interfacing the photodiode arrays with a digital oscilloscope recorder is described in detail.

Quantitative measurements of light scattering in decomposing 3He4He liquid mixtures

Physica B+C, 1981

ABSTRACT

Gas separation using ultrasound and light absorption

Apparatus and method for remote, noninvasive characterization of structures and fluids inside containers

Non-invasive fluid density and viscosity measurement

Nitrogen dioxide detection

Microwave determination of location and speed of an object inside a pipe

Method for establishing the presence of salmonella bacteria in eggs

Method for noninvasive intracranial pressure measurement

Non-Invasive Characterization Of A Flowing Multi-Phase Fluid Using Ultrasonic Interferometry

A superlattice strain gage

23rd Joint Propulsion Conference, 1987

ABSTRACT

Preface for Volume 4

Handbook of Elastic Properties of Solids, Liquids, and Gases, 2001

Non-contact fluid characterization in containers using ultrasonic waves

Apparatus and method for non-contact (stand-off) ultrasonic determination of certain characterist... more Apparatus and method for non-contact (stand-off) ultrasonic determination of certain characteristics of fluids in containers or pipes are described. A combination of swept frequency acoustic interferometry (SFAI), wide-bandwidth, air-coupled acoustic transducers, narrowband frequency data acquisition, and data conversion from the frequency domain to the time domain, if required, permits meaningful information to be extracted from such fluids.

Bismuth magnetoresistive thermometry for transient temperature measurements in liquid helium

Review of Scientific Instruments, 1981

We have developed a thermometric technique adapted from our work on the galvanomagnetic effects i... more We have developed a thermometric technique adapted from our work on the galvanomagnetic effects in bismuth at liquid helium temperatures. We find that a single crystal of bismuth can be used effectively as a thermometer for transient temperature measurements at these low temperatures. The thermometric property which is exploited is the strongly temperature-dependent magnetoresistance exhibited by these crystals at liquid helium temperatures. The bismuth thermometer is characterized by a fast thermal response, good sensitivity, low Kapitza resistance, and ease of electrical resistance adjustment, and it is particularly well suited to the situation in which the thermometer is itself used as a heater. In earlier work we successfully used these properties to study transient heat transfer from bismuth into liquid helium I and to measure the homogeneous nucleation temperature of liquid helium I.

Noninvasive method for determining the liquid level and density inside of a container

Disclosed is a noninvasive method for determining the liquid level and density inside of a contai... more Disclosed is a noninvasive method for determining the liquid level and density inside of a container having arbitrary dimension and shape. By generating a flexural acoustic wave in the container shell and measuring the phase difference of the detected flexural wave from that of the originally generated wave a small distance from the generated wave, while moving the generation and detection means through the liquid/vapor interface, this interface can be detected. Both the wave generation and wave detection may be achieved by transducers on the surface of the container. A change in the phase difference over the outer surface of the vessel signifies that a liquid/vapor interface has been crossed, while the magnitude of the phase difference can be related to fluid density immediately opposite the measurement position on the surface of the vessel.