JPS6113652A - Sensor for loading to which radiation deterioration reduction countermeasure is considered - Google Patents

Abstract

PURPOSE:To recover radiation deterioration under a space environment easily by heating a CCD and recovering the radiation deterioration of the CCD utilizing annealing effect. CONSTITUTION:A Peltier element 3 is operated as a cooling element when a device is operated normally as a sensor. Only a temperature control driving circuit 5 and the element 3 are conducted during the suspension period of the device, and the polarity of a temperature control driving signal outputted from the circuit 5 is inverted, thus resulting in heating action to a CCD2 of the element 3. Consequently, the CCD2 can be heated or cooled by changing the polarity of an output from the circuit 5 as required. The CCD2 is heated at a high temperature on the suspension period of the whole device, thus bringing the CCD2 deteriorated by radiation close to an original state and recovering the CCD by an annealing effect.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a charge coupled device (COD) and a detector.

[Conventional technology]

In conventional devices of this type, the CCD was used at room temperature or cooled. Therefore, in conventional equipment of this type, as a countermeasure against COD radiation and deterioration, COD
The only way to deal with this problem was to put a shield around the area of D, or to develop and install a new CCD with improved radiation resistance of the element itself. The former method has the disadvantage that the device becomes extremely heavy, while the latter method has the disadvantage of requiring a large amount of development cost and technical difficulties in developing a radiation-resistant process.

[Purpose of the invention]

An object of the present invention is to provide an on-board sensor that takes measures to recover the radiation deterioration of a CCD in a space environment.

[Structure and operation of the invention]

The on-board sensor of the present invention uses a Bertier element or a heater to reduce carbon dioxide caused by radiation in the space environment.
When a CD detector deteriorates, the detector itself is directly heated to a high temperature and the annealing effect of the semiconductor is used to restore the detector that has deteriorated due to radiation.

Moreover, when operating as a normal sensor, the COD is cooled again by the Vertier element and used.

〔Example〕

FIG. 1 is a block diagram showing an embodiment of the present invention, 1
2 is an optical system, 2 is a CCD, 3 is a Peltier element, 4 is a signal processing section, 5 is a temperature control drive circuit, and 6 is a signal output terminal.

To operate the lens, a target image focused by the optical section 1 is irradiated onto the CCDZ. The CCD 2 photoelectrically converts the irradiated light and outputs a voltage signal to the signal processing section 4. Pulses for driving the CCD 2 are supplied from the signal processing section 4 . The sensor signal processed by the signal processing section 4 is output to the output end 6.

The Vertier element 3 normally operates as a cooling element when the device is operating as a sensor.

Further, the drive signal is output from the temperature control drive circuit 5. Therefore, by energizing only the temperature control drive circuit 5 and the Bertier element 3 during the idle period of the device, and reversing the polarity of the temperature control drive signal output from the drive circuit 5, the Bertier element 3 is connected to the CCD 2. It can have a heating effect. Therefore, it is possible to heat and cool the CCD 2 by changing the polarity of the output of the drive circuit 5 at necessary times.

By heating the CCD 2 at a high temperature when the entire device is in its first heat period, the CCD 2 degraded by radiation can be restored to its original state due to the annealing effect.

FIG. 2 is a block diagram showing another embodiment of the present invention. In the embodiment of FIG. 1, the Bertier element 3 was used for both cooling and heating, but in the embodiment of FIG. , the Vertier element 3 is used exclusively for cooling, and the heater 7 is used exclusively for heating. 8 is a drive circuit for the heater 7. The operation of other parts is the same as the embodiment shown in FIG.

〔Effect of the invention〕

As explained above, according to the present invention, there is an advantage that the radiation deterioration of the CCD in the space environment can be recovered by heating the CCD and utilizing the annealing effect. As shown in FIG. 2 of the embodiment, in the normal case, the above-mentioned effects can be obtained by heating the COD with a heater. In addition, as shown in FIG. 1 of the embodiment, the Bertier element used for cooling the CCU is
If the CCD is heated by inverting the polarity of the Peltier drive signal, there is an advantage that the above-mentioned effect can be obtained using only the Vertier element without using a heater.

[Brief explanation of the drawing]

FIGS. 1 and 2 are block diagrams showing embodiments of the present invention. 1 is an optical system, 2 CCDs 13 are Bertier elements, 4 is a signal processing section, 5 is a temperature control drive circuit, 6 is an output end, 7 is a heater, and 8 is a heater drive circuit. Rod 1 Figure 2 Figure

Claims (3)

[Claims] (1) In a satellite-mounted sensor that uses a charge-coupled device as a detector, the charge-coupled device is heated by a heating means, and radiation degradation of the charge-coupled device is recovered by an annealing effect. Satellite-mounted sensor with reduction countermeasures. (2) The mounting sensor with measures against radiation deterioration as set forth in claim 1, wherein the heating means includes a Peltier element. (3) The mounting sensor with measures against radiation deterioration as set forth in claim 1, wherein the heating means includes a heater.