Development of Interdigitated Capacitive Sensor for Real-Time Monitoring of Sub-Micron and Nanoscale Particulate Matters in Personal Sampling Device for Mining Environment

Details

• Personal Author:
  Back D ; Janes DB ; Seo W ; Theisen D ; Tsai CS-J
• Description:
  While current personal monitoring devices for mining industry are optimized for monitoring microscale particles, a higher resolution technique is required to detect sub-micron and nanoscale particulate matters (PM) due to smaller volume and mass of the particles. In this work, an interdigitated capacitive sensor is designed for monitoring sub-micron and nanoscale particle concentration in real-time for mining environment and other applicable environments. The 2 mm ×12 mm disposable sensor chip fits generic air sampling cassette housing. The re-usable readout board uses resistance-capacitance (RC) delay time constant for monitoring capacitance shift and data is recorded in real-time. The sensor showed clear response with respect to a commonly used test dust, and positive capacitance shift is observed after test. Among the collected particles, about 77 % are sub-micron and most of microparticles are agglomerates of sub-micron particles. A simulation study showed that our sensor response is in a region that is proportional to the particle volume collected on sensor. A comparison with gravimetric method showed that less than 1/1000 of collected particle mass on the sampler is responsible for sensor response due to radial distribution of particle deposition and sensor location. The sensor response is converted into a standard airborne mass particle concentration gm 3 to demonstrate a continuous monitoring of particle concentration. An incorporated microheater improved stable capacitive sensor reading under air flow and various humidity. [Description provided by NIOSH]
• Subjects:
  Aerosols Environmental Monitoring Mining Occupational Health Particulate Matter Safety
• Keywords:
  Air Sampling Author Keywords: Particulate Matter Capacitive Sensor Microheater Mining Industry Monitoring Systems Nanoparticles Particle Size Particulates Real-time Monitoring Sensors

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• ISSN:
  1530-437X
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  California ; Colorado ; Indiana ; OSHA Region 5 ; OSHA Region 8 ; OSHA Region 9
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  20
• Issue:
  19
• NIOSHTIC Number:
  nn:20068286
• Citation:
  IEEE Sens J 2020 Oct; 20(19):11588-11597
• Contact Point Address:
  Candace Su-Jung Tsai, Department of Environmental and Radiological Health Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO 80523 USA
• Email:
  candace.tsai@colostate.edu
• Federal Fiscal Year:
  2021
• Performing Organization:
  University of California Los Angeles
• Peer Reviewed:
  True
• Start Date:
  20050701
• Source Full Name:
  IEEE Sensors Journal
• End Date:
  20270630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:d7d82fde77b8dbc8fb78905e627b136b4fef22558833b078fa8ca2b443bc8f56fce0ad6bf1db01dc9755f6a80c9789fe6404ff3ac7acc4bb573776a3e7b58373
• Download URL:
  https://stacks.cdc.gov/view/cdc/230466/cdc_230466_DS1.pdf
• File Type:
  [PDF - 2.81 MB ]