RADHAZ to Ordnance (HERO)

RF Radiation Hazards for Ordnance

Explosive Ordnance and other electrically initiated devices (EID) that employ Electro-Explosive Devices (EED) may be susceptible to external
electromagnetic energy during storage and operation. This hazard is commonly referred to as Electro-Explosive Hazards (EEH). The sources of
EEH are:

  • Inadvertent application of power, including electromagnetic interference (EMI)
  • Radiation Hazards (RADHAZ)
  • Electrostatic Discharge (ESD)
  • Lightning
  • Electromagnetic Pulse (EMP)
  • Transient Radiation Effects on Electronics (TREE)
  • Magnetic Fields

External electromagnetic energy can cause inadvertent operation or degraded performance of EID systems if the electromagnetic energy levels
exceed specified safe limits. Degraded performance of EIDs is commonly referred to as ‘dudding’, whereby the EED will no-longer function correctly
within its defined specification due to expose to excessive electromagnetic energy. Both inadvertent operation and dudding of EID systems can
result in catastrophic consequences including injury and/or death of personnel, which presents an unacceptable safety hazard.

Radiation Hazards to ordnance (also commonly referred to as Hazards of Electromagnetic Radiation to Ordnance, or HERO) is the inadvertent
operation or degraded performance of Explosive Ordnance caused by exposure to radiated electromagnetic sources such as RF transmitters.
The HERO risk increases for soldier manpack and platform (vehicle, aircraft, ship) systems that have high power RF transmitters
(Radio Communications/Radar/FP ECM/EW) located in close proximity to EIDs.

Phasor can support projects acquiring new systems and existing in-service systems with any matters related to EEH and HERO. Our team has a
sound knowledge and understanding of EEH and HERO including the key US, UK and Australian standards as follows:

  • DEOP 101, DEOP 115 & DEOP 204
  • STANAG 4560
  • MIL-STD-464 & MIL-STD-240
  • NAVSEA OP 3565 Vol 2

The Phasor team has proven experience conducting HERO Assessments and EID Compatibility Assessments for military platforms with multiple
RF transmitters and EIDs to ensure there are no unsafe hazards for personnel. Of note, Phasor has developed innovative techniques to conduct
RF surveys by simulation and/or measurement to make sure radiated electromagnetic fields are below the specified safe limits for ordnance.
Our simulation techniques have been validated against measured data and are proven to be accurate and reliable. During the assessment
process, if electromagnetic fields are found to be above specified safe limits for EIDs, Phasor works with customers to develop HERO controls to
ensure that their system is safe for use.

For more complex HERO problems, Phasor can also assist customers to conduct test and measurement of inert, instrumented ordnance
(often referred to as dummy rounds) to assess if the levels of induced RF currents from external electromagnetic fields are below specified
safe limits.