# Emisense Technologies

> Emisense Technologies is a Ladera Ranch, California sensor company that builds PMTrac, an electrostatic particulate matter (ePM) sensor for measuring soot and ultrafine particles directly in the exhaust stream. Founded in 2009 by serial automotive-electronics entrepreneur Patrick Thompson, the company sells a low-cost, durable, in-situ alternative to lab-grade emissions instruments - aimed at automotive on-board diagnostics, generators, and industrial combustion. In 2025 it signed a global Tier-1 automotive supplier to industrialize the sensor, with serial production targeted for 2028.

- **Founded:** 2009
- **Headquarters:** Ladera Ranch, California, United States
- **Founders:** Patrick Thompson (Founder & CEO), Joe Fitzpatrick (CTO)
- **Team size:** ~5 employees
- **Products:** PMTrac ePM Sensor, EmTrac Cloud Telemetry, Tier-4 Generator Monitoring, Sensor IP Licensing
- **Notable:** Developed PMTrac, an electrostatic PM sensor with a demonstrated detection floor below 0.5 mg/m3, Built a patent portfolio covering electrostatic PM/PN sensing and emissions telemetry, Signed a global Tier-1 automotive supplier (2025) to industrialize the sensor toward 2028 production

## Products & services

- **PMTrac ePM Sensor** — An electrostatic particulate matter (ePM) sensor that measures PM10, PM2.5, ultrafine particulates, and particulate number directly in the exhaust stream using a ~1kV concentric electrostatic trap, with a demonstrated detection floor below 0.5 mg/m3 and faster response than resistive/accumulator sensors.
- **EmTrac Cloud Telemetry** — A cloud-connected emissions telemetry system that logs PM and NOx data in real time for compliance decision-making, demand-response readiness, and fleet/site monitoring.
- **Tier-4 Generator Monitoring** — Low-cost continuous ePM monitoring for large diesel and multi-fuel generators in data centers and hospitals, used for pre-certification testing, DPF retrofit evaluation, and demand-response qualification - at less than 1% of generator value.
- **Sensor IP Licensing** — Patent portfolio and technology licensing of the electrostatic PM/PN sensing platform to Tier-1 automotive suppliers for industrialization and mass production.

## Achievements

- Developed PMTrac, an electrostatic PM sensor with a demonstrated detection floor below 0.5 mg/m3
- Built a patent portfolio covering electrostatic PM/PN sensing and emissions telemetry
- Signed a global Tier-1 automotive supplier (2025) to industrialize the sensor toward 2028 production
- Validated sensor correlation through independent testing at Southwest Research Institute
- Extended the technology beyond automotive to data-center and hospital generator Tier-4 compliance (2026)
- Founder Patrick Thompson previously created the LM-1 lambda meter at Innovate Motorsports (acquired by AutoMeter)

## Latest updates

- **2026-03** — Launched low-cost ePM monitoring to accelerate Tier-4 compliance for data-center and hospital diesel generators, at under 1% of generator value.
- **2025-03** — Announced agreement with a global Tier-1 automotive supplier to commercialize next-generation PM sensors; samples in 2025, serial production targeted for 2028.
- **2013-03** — Closed $6.5M Series C round led by 9th Street Investments to fund product launch, R&D, and global validation testing.

## Links

- Website: https://emisense.com
- LinkedIn: http://www.linkedin.com/company/emisense

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Profile page: https://yespress.io/emisense
Published by YesPress — https://yespress.io
Last updated: 2026-06-15