Mining Contract: Caplamp Particulate Monitoring System

Contract # 75D30120C09347
Start Date 9/15/2020
Research Concept

Current continuous personal dust monitors (CPDMs) do not track location in the mine or measure silica exposure, which causes pneumoconiosis, silicosis and chronic obstructive pulmonary disease (COPD). Today’s miner needs a silica monitoring device which is integrated into an existing piece of equipment that can detect and alert them of exposures to silica while also recording where they are located underground when exposed. This contract will develop a Caplamp Particulate Monitoring Systems (CPMS) – an integrated silica monitoring and tracking device by leveraging research performed using multi-wave Raman LIDAR to identify the optimal emitter and detector for the measurement of crystalline silica.

Contract Status & Impact

This contract is ongoing. For more information on this contract, send a request to

Coal seams are becoming smaller, more difficult to mine, and requires additional rock cutting which increases miners’ exposure to respirable silica. The best way to protect workers, and provide information to mine operators, is to have a real-time, silica-monitoring device that is integrated into existing equipment that mine workers currently wear.

This contract will develop a commercial, intrinsically safe Caplamp Particulate Monitoring System (CPMS) that will alert miners when silica PEL has reached unsafe levels, or when an individual miner’s exposure to particulates has reached an unsafe level. To successfully develop this technology, two barriers must be overcome:

1) identify the commercially available emitters and detectors that can be utilized and

2) successfully integrate all the components into the helmet while meeting size and power restrictions of a cap lamp headpiece and waist-worn battery.

An intrinsically safe waist battery MSHA-approved for the Strata Personal Alarm Device and an intrinsically safe underground cap lamp will be leveraged to develop an Intrinsically Safe silica detection system that will be placed inside a cap lamp and waist worn battery pack. 

The system will use infrared spectrophotometry which is an accurate and widely used method to determine silica content. It will also incorporate the principles of Raman scattering.

Despite its accuracy, the instrument’s cost, size, and data collection speed are major obstacles to making these devices mobile and operable in real time. Fortunately, advances in light detection and ranging (LIDAR) technology incorporating Raman scattering measurements has shown great promise. A prototype of the CPMS will be developed through identification of optimal Raman Backscattering wave-length emitters and detectors, testing and evaluation of commercially available off-the-shelf emitter and detectors on custom PCBs, and integration of emitter and detector into the cap lamp.

Page last reviewed: 3/23/2021 Page last updated: 3/23/2021