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The purpose of project 39.3 was to measure the thermal flux per unit a rea at a series of specified distances from a nuclear detonation. The instrumentation chosen was eppley thermopile indicating on a strip-cha rt paper recorder. Two stations failed to yield results because of pow er failures and blast damage. Results were obtained at 5500, 6800, and 10,500 ft. These results follow the inverse-square-law fall-off, with in the limits of reasonable experimental error.
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BEST AVAILABLE COPY Defense Technical Information Center DEFENSE LOGISTICS AGENCY Cameron Station • Alexandria, Virginia 22304-6145
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BEST AVAILABLE COPY We are pleased to supply this document in response to your request. The acquisition of technical reports, notes, memorandums, etc., is an active, ongoing program at the Defense Technical Information Center (DTIC) that depends, in part, on the efforts and interests of users and contributors. Therefore, if you know of the existence of any significant reports, etc., that are not in the DTIC collection, we would appreciate receiving copies or infor mation related to their sources and availability. The appropriate regulations are Department of Defense Directive 3200.12, DoD Scientific and Technical Information Program; Department of Defense Directive 5200.20, Distribution Statements on Technical Documents (amended by Secretary of Defense Memorandum, 18 Oct 1983, subject: Control of Unclassified Technology with Military Application); Military Standard (MIL-STD) 847-B, Format Requirements for Scientific and Technical Reports Prepared by or for the Department of Defense; Depart ment of Defense 5200.1R, Information Security Program Regulation. Our Acquisition Section, DTIC-FDAB, will assist in resolving any questions you may have. Telephone numbers of that office are: (202)274-6847, BEST AVAILABLE COPY
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ea if cu DOCUMT SEQVICE CENTER This document la the property of the United States Government. It Is furnished for the du ration of the contract and shall be returned when no longer required, or upon recall by ASTIA to the following address: Armed Services Technical Information Agency, Document Service Center, Knott Building, Dayton 2, Ohio. KOTICE: ?aiEN GOVERNMENT OR OTEER ORAW'TNGS, SPECIFICATIONS OR OTHER DATA AETUoSD FOR ANY PURPOSE OTHER TIL\N IN CONNECTION WITH A DEFINITELY RELATED GOVERNMENT. PROCUREMENT OPERATION, THE U. S. GOVERNMENT THEREBY OCCURS NO RESPONSIBILITY, NOR ANY OBLIGATION WHATSOEVER; AND THE FACT THAT THE GOVERNMENT MAY HAVE FORMULATED, FUPJOCHED, OR IN ANY WAY SUPPLIED THE SAID DRAWINGS, SPSCUTCATIONS, OR OTHER DATA 13 NOT TO BE REGARDED BY IMPLICATION OR OTHERWISE A3 IN ANY MANNER LICENSING THE HOLDER OR ANY OTHER PERSON OR CORPORATION. CR CONVEYING ANY RIGHTS OR PERMISSION TO MANUFACTURE, USE OR SELL ANY PATENTED INVENTION THAT MAY IN ANY WAY BE RELATED THERETO. BEST AVAILABLE COPY
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PEST AVAILABLE COPY Roporl to >)»• Test Director THERMAL RADIATION MEASUREMENT Edgerton, Cermrstonscn ft Grier, be. Lis Vegu, Nevada BEST AVAILABLE COPY
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Tfra purpose Of Project 39.S was to measure the thermal flux per cult ares at a aeries rf specified distastes from a nuclear detonation. The instrumentation chosen «as an Epptey V Two stations failed to yield results because of power failures and blast damage. Results were obtained at 5500, 0800, and 10,500 ft. These results follow the inrerse-square-lav talloff, within the limits of reasonable experimental error. . BEST AVAILABLE COPY
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2.1 Schematic Diagram of Thermal-liux Recorder. ......f 4.1 Calories per Square Centimeter Va Distance .... .. ... 10 4.1 . Measareaaeat at Thermal Tim .........IS BEST AVAILABLE COPY
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BEST AVAILABLE COPY the thermal flux per xmlt area at a aeries of opecifled distaaceo and at a specified azimuth from a nuclear detonation. The lecatioo for the measurement stations corresponded with those chosen by Project 31.5 for their samples. BEST AVAILABLE COPY
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Ten thcrmcpUeo, %ith their associated recorders, were set np at fire distances from the detonation. Fire cf these yielded thermal pulses which appeared normal and suitable for analy sis. The fire traces were obtained at the three ouiermcst stations, A and B at 10,500 ft, A and B at WO ft, and A at 5500 ft. The thermopiles, each with a different filter, were placed about 0 ft above, acd parallel to, the ground, facing the source, which was detonated oa a tower. Table 2.1 raEmarlxes the thermopile Instrumentation; Fig. 2.1 shows the electrical laetraBsectatSca of each statioa. return to aero MJ&M A Evaporated metal oa gtaae •3 Record, oft scale The recorders were calibrated to give a full-scale deflection for 1-mv input, as Illus trated In Fig. 2.2. To provide the chart time scale, a time interval of 1 min. was measured with a stop watch and recorded for each Instrument. The filters on the operating units at 5500 and 0800 ft were metal dlchs with small holes drilled through the centers. The transmission of these filters was calibrated'In the laboratory by the setup shown la Fig. 2.4. The flux was measured without any filter, and percentage values of that dux were calculated as the thermopile with the filter was rotated in 2-deg steps from normal until no flux was recorded. Curves for each filter were drawn. The filters at 10,500 ft were thin metal films deposited on glass and protected by a cover glass. The percentage of transmission was measured normal to the source only since there was no appreciable decrease in transmission as the bare thermopile was rotated well beyond the angle at which these thermopiles would see the source. A certificate of sensitivity cali bration accompanied each thermopile. BEST AVAILABLE COPY
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- BEST AVAILABLE COPY the *hape oi tbe aource acd the angle at which the thermopile ‘looked' at the eoarce !• ntceazAif. The eoarce wee approximately eU'ptically ehxped and was located near the edge tfl the rugsi* field rfytoMd the recelter. As ebo^a in SJ, the source did not touch the eeater oi ttse field of-yfeua The flux at the receiver for a general case Is lUcstrated in Fig. 3.2 and may be stated; BEST AVAILABLE COPY
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BEST AVAILABLE COPY The ores o( tbe source may be conslclered tbe sum of the portioM of tbe Miwit, M eboim ta Fig. 3.4. (ft Is necesaary to define area In this manner In order to correct tor tbe trane* wileetnw at escb Olter, »ntch Varlee repldly vltb a.) The area of each innulue le A 2(1 <]JL From tbe fcdloeiag expreseloa t as a function of P may be foend C plotted as a toctlofi of 1 wQl gtre a correepcn&js 0 for each tad tb. area may be found - For each i there exists a corresponding a which may be plotted as a function of area. Tbe theoretical lime doe to tbe eoarce la then Tbe experimentally received
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BEST AVAILABLE COPY tar to aatara taetea, gtvea Ua floa ta caterte* par ayaara ceo&n«t*r racitaad by aacb tbana»> ptte Tkl* flu. terrraar4 by tba factor tea to tba aoincmul eateatatfoa of tta aourca aad ra> BEST AVAILABLE COPY
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BEST AVAILABLE COPY □pl&g debrte. Atlhonth the chart drtre nciw operated sormaUp, tne record from the other ataee drcott tethe feordar. deBectVrw ad the peak. ~~r, aiace tbe fall-off ta as expoeentul hiactlon, the peaks caa he eattifacterilp eatsapslaled. At ;v, WOO-ft atatioo recorder B shove neither the peak cor the entire 1*11-00. At abcot M per cent of the peak, there te a power failure, and the pen CBaeaa to trace peopertp. The retailta cf this project are etovn it Table 4.1 aad Fig. 4.1. The logarithm of the flee plotted a^alast the loptritlsa of the distance glees eerp searip a straight line with a alope of - 2, iadlcabbg Umi the fhoc la bneraetp propi ttonal to the square of the distance. this value ta erroneous. It is believed that the straight hue drawn in Fig. 4.1 represents the thermal fin* as a function of distance with tn accuracy cf *20 per cent. Tba prrtimlnary investigations suggested that there might be a problem due to dust mask ing the therstopUce, which were relatively close to the ground. This possibility has been tnvcs(l-jilt'd through the use of available pboiographle records, and it ta concluded that a significant dust pull did not rise until alter the thermal polae. BEST AVAILABLE COPY
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KHOTT BUILOIHQ, DAYTON. 2. OHIO This document is the property of the Hailed States Government. It is furnished for the du ration of the contract and shall be returned when no longer required, or upon recall by ASTIA to the following address: Armed Services Technical Information Agency, Document Service Center, Saotfe Building, Dayton 2, Ohio0 NOTICE: WHEN GOVERNMENT OH OTHER DRAWINGS. SPECIFICATIONS OR OTHER DATA AkE VISED for any purpose other than in connection v/ith a definitely related GOVERNLSENT PROCUREMENT OPERATION, THE U. S. GOVERNMENT THEREBY INCURS NO RESPONSIBILITY, NOR ANY OBLIGATION WHATSOEVER; AND THE FACT THAT THE GOVERNMENT MAY RAVE FORMULATED, FURNISHED, CR IN ANY WAY SUPPLIED THE SAID DRAWINGS, SPECIFICATIONS, OR OTHER DATA IS NOT TO BE REGARDED BY IMPLICATION OR OTHERWISE AS IN ANY MANNER LICENSING THE HOLDER OR ANY OTHER PERSON CR CORPORATION, OR CONVEYING ANY FIGHTS OR PERMISSION TO MANUFACTURE, USE OR SELL ANY PATENTED INVENTION THAT IIAY Hi ANY WAY BE RELATED THERETa BEST AVAILABLE COPY
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