Quaesta Instruments Tucson Arizona Founded in 2008 Staff: 10 Electronic devices: radiation detection environmental monitoring data logging telemetry Off-the-shelf.

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Presentation transcript:

Quaesta Instruments Tucson Arizona Founded in 2008 Staff: 10 Electronic devices: radiation detection environmental monitoring data logging telemetry Off-the-shelf and custom products

Neutron Pulse Monitors -Proportional gas detectors Data logging devices Environmental sensors Mobile neutron detectors Soil moisture monitoring stations (radiation based) Products

Neutron Pulse Monitor NPM

Pulse Height Spectrum Classical 3He spectrum digitized over 128 bins

Plateau Method Counting Plateau Lower discriminator

Plateau Method Requires many points for good resolution on discriminator set point For low count rates, time per point may be large

Lower Discriminator Upper Discriminator Multichannel Analyzer

Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

Setting the Discriminator Levels With a Multichannel Analyzer (MCA)

Setting the Discriminator Levels With a Multichannel Analyzer (MCA) Valley Peak

Setting the Discriminator Levels With a Multichannel Analyzer (MCA) Peak Valley

Real Spectra

He3 tube failure under thermal cycle testing

Example of Field Neutron Detector System Failure, BF3 Detector Time Series

Histograms before and after suspicious neutron counts Dirty Connector

NPM Architecture

Value of a Digital NPM Computer interface MCA & spectra - optimization Monitoring Data logging

Data Logger Analog & digital I/Os Relays USB, RS-232, SDI-12 SD cards Connect to NPMs External Sensors Telemetry

Remote Monitoring & Mobile Detectors

Roving Detector Data

Noise produced by humidity

Remote Monitoring & Mobile Detectors

IAEA: Mobile Unit for Neutron Detection (MUNDs)

IAEA: MUNDs NPM NPM: Ethernet + 15MHz input pulse counter

Soil Moisture Monitoring Average Soil Moisture 600 meters Field scale soil moisture monitoring using cosmic ray neutrons Measures fast and slow neutrons Pressure & Humidity dependent

Soil Moisture Monitoring Challenges Low power consumption Very low count rate High stability in calibration required wide temperature range High resolution pressure meas

Soil Moisture Monitoring

Alpine Location

New Stuff

Neutron Detector Arrays

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