MIL-STD-398A
METHOD 301
HEAT FLUX MEASUREMENT
1. PURPOSE. Heat flux measurement is conducted to insure that personnel are not exposed to a maximum radiant heat flux as determined in the equation given in paragraph 4.1.3 of this standard.
2. DESCRIPTION OF TEST. A maximum credible incident is created. Heat flux transducers are used to measure radiant heat flux.
3. CRITERIA FOR PASSING TEST. The operational shield shall be considered acceptable if it can be determined, from heat flux-distance and heat flux-time plots of test data, that personnel will not be exposed to a radiant heat flux rating exceeding the formula in paragraph 4.1.3 of this standard.
4. INSTRUMENTATION. Heat flux transducers and electronic recording system. Based on the thermal flux expected at the location of the transducers, the instrumentation system shall have the necessary response time and bandwidth to acquire data. Instrumentation shall be calibrated in accordance with current procedures in TB 43-180, California Requirements for the Maintenance of Army Materiel.
5. TEST PROCEDURE
5.1 Location of transducers
5.1.1 When the shield is tested in a simulated operational bay environment, heat flux readings shall be taken at the following locations:
a. At the center of probable head location of each operator. For standing locations the transducers shall be positioned 65 inches (1.65 meters) above the floor; for sitting location it shall be 31.5 inches (0.80 meters) above the seat.
b. At representative positions where transient personnel may be located.4
5.1.2 In a free field test, flux values at various distances from the point of detonation can be
2 2
estimated by the relationship O1d1 =O2d2 , where
= Heat flux in cal/cm2-sec.
d= Distance from point of detonation.
4 Transducer locations shall be as designated by the design activity in the test plan and approved by authorized authority.
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