Balloon borne differential temperature sensor and transmission system专利检索-电流测量探头传感器与探测器专利检索查询-专利查询网

Balloon borne differential temperature sensor and transmission system

阅读：2发布：2022-04-29

专利汇可以提供Balloon borne differential temperature sensor and transmission system专利检索，专利查询，专利分析的服务。并且Differential temperature sensing and transmission apparatus is carried by a gas-filled meteorological balloon from ground level through the tropopause for continuously measuring differential temperature and transmitting same back to the ground. The temperature difference between two probe sensors is converted to a root means square (RMS) electrical voltage by means of processing circuits and is applied to the modulator of a modified radiosonde transmitter for transmission from aloft to a groundbased receiver. Differential temperature (AT) sensing probe consist of two platinum wires connected as two resistance arms in a null balanced wheatstone bridge, the output of which is demodulated, amplified, root mean squared and applied to the modulated radiosonde transmitter to vary the pulse repetition frequency (PRF) linearly with the value of ( Delta T2)1/2. Dynamic range of the RMS temperature difference is increased by a two-step variable gain control, a feedback system being employed to automatically select one of the two gain ranges over 0.004*C. to 0.676*C.; a signal indicating the gain scale in use is applied as one of the inputs to the modified radiosonde transmitter for proper correlation of the data at the ground-based receiver. The linear change of transmitter PRF with the Delta T signal input is produced by charging a capacitor with a current that varies linearly with the change in the Delta T signal.，下面是Balloon borne differential temperature sensor and transmission system专利的具体信息内容。

权利要求

1. A system for continuously measuring differential temperature from the ground level to the tropopause comprising a gas-filled meteorological balloon and measuring and transmitting apparatus supported by said balloon during an ascending flight comprising two substantially identical probes having resistances which vary with temperature, means for detecting relative changes in resistance of said probes and producing an electrical signal having a value corresponding to the difference in temperature at said probes, a radio frequency transmitter comprising an oscillator, modulator means for turning said oscillator on and off to produce pulses having a repetition frequency, and means for applying a signal proportional to said differential temperature signal to said modulator means for varying the pulse repetition frequency of said oscillator at a rate corresponding to the value of said differential temperature signal, and receiver means on the ground adapted to receive said pulses.

2. The system according to claim 1 with means for amplifying said signal at low and high gain scales, means responsive to the magnitude of said signal for automatically selecting one of said gain scales for operating on said signal and for generating a scale signal indicative of said selection, and means for periodically applying said gain signal to said modulator means.

3. The system according to claim 1 which includes means responsive to said differential temperature signal for generating an output signal corresponding to the square root of the squared time-averaged value of said temperature difference (RMS), said RMS signal being applied to said modulator means.

4. A system for continuously measuring differential temperature from the ground level through the tropopause comprising a gas-filled meteorological balloon and measuring and transmitting apparatus supported by said balloon during an ascending flight comprising two substantially identical probes having resistances which vary with the temperature and supported in closely spaced relationship to each other, a wheatstone bridge having four resistance arms in electrically balanced relation, two of said resistance arms comprising said probes, means for electrically energizing said bridge for producing a signal proportional to the difference in the resistances of said probes, a feedback circuit connected between the output of said bridge and the other two of said resistance arms whereby to maintain the bridge in a null balance state, means for applying said bridge output signal to a root mean square (RMS) circuit and deriving a RMS signal output corresponding to the square root of the square of the differential temperature of said probes, a radio frequency transmitter comprising an oscillator and a modulator adapted to turn said oscillator on and off at a variable repetition frequency to produce a train of pulses, and means for applying said RMS signal to said modulator whereby to vary the repetition frequency of said pulses in proportion to the values of said RMS signal.

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