a . . < 3 fr 5 to : 4 i Table 1—RESPONSE OF K-2 RADIOMETERS E.M.P. ‘millivolta) “ . oa / “ r secrete 6 PeerPR & L ott . «i Irradiance (g cal om™ sec!) Radiometer No.: 2567 Coating: Aluminized 1.6 8.1 3.8 14 9.0 18 4 \ Li 2.0 2.8 4.9 6.4 12.1 2563 Uncoated t 1.2 2.5 2.7 8.1 6.6 12.7 2565 Blackened 2.6 4.7 . 6.9 14.3 12.2 21.7 From the data given in the table, the least-mean-square values for response were de- aN termined. For the aluminized and uncoated thermocouples an output of 1 mv is obtained with, respectively, in gram calories per square centimeter per second, 1.49 and 1.43. For the , a ~y a. Ut f “ we “4 L Nee wy eo . ; blackened thermocouple only the lower values of irradiance were used in the computation, and a response of 0.69 resulted. An output of 1 mv indicated a te -aperature rise of 30°C. 2.2.2 Calibration of Telemetry System Thermalcalibration of the receiving stations was accomplished by measuring oscillograph gaivanometer deflections as a function of trequency input to the discriminators. The manufacturer of the K-2 thermocouple performed a calibration of the temperature rise vs thermo covple output. After installation of transducers in the canisters, it was necessary to determine subcarrier oscillator-outnut frequency as a function of thermocouple output. This calibration was made by applying known voltages to the transducer and subcarrier osciliator- input circuit and recording the subcarrier oscillator-frequency deviation. The impedanceof the K-2 thermocouples varied from 3.6 to 4.7 ohms, and a resistance was added to each circuit to make the impedance, as seen by the control coil, 5 ohmsin all cases. Ten calibration voltages from 0 to 30 mv were applied to the circuit which caused known currents to flow through the control winding of the subcarrier oscillator. As the voltage was applied in step functions of 10 mv to the circuit, galvanometer deflections as a function of subcarvier oscillation frequencies were recorded by the receiving stations. This calibration was performed on all canisters used in each test prior to loading the can- isters in the aircraft bomb bays. At approximately H~$ hr this calibration was repeated while the aircraft was flown in a prescribed pattern over the receiving telemetry station located aboard the USS Oakhill. The air-borne calibrations were received and reco.ded by this station. The calibration performed prior to loading the canisters aboard the aircraft was made to pre—_f J vent loss of calibration if operational difficulties had prevented the air-borne calibration from being made. Successful air-borne calibrations were made on each test and were used in all cases to obtain final data. 2.3 \ MIKE SHOT The operational problems consisted of five phases: (1) the positioning of two B-29 aircraft over a drop point both in reference to time and course position, (2) the positioning of canisters in space by correcting the aircraft drop point for the integrated horizonial wind drift of the parachute-borne canisters, (3) the deployment of 12 parachute-borne canisters irom the air- craft, (4) the instillation of the recording telemetry station on the deck of a Landing Ship Dock (LSD), and (5) the recording of telemetered blast-pressure and thermal data from each ca: ‘ster. Figure 2.2 shows the location of the radio telemetry ground station in relation to Ground Zero. . 15 R’STRILTED DATA we. SECURITY INFORMATION z é = #é IN tee, a \ Noy