JPH0326791B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic integration device used for recording the magnetic field received in a magnetic field by a person engaged in work that requires long hours of work in a magnetic field, for example.

<Background> Until now, there has been no effort to manage the magnetic flux received within a magnetic field, and efforts to investigate the effects of the received magnetic field have also been slow due to the lack of equipment that can manage the received magnetic flux. The reality was that there was no such thing. However, in recent years, with the development of science, the use of magnetic fields has increased, and for example, there have been applications such as linear motor cars and devices that can take tomographic images of the body using nuclear magnetic resonance in medicine, and the use of superconducting magnetic fields has also increased. There is. However, the management of the effects of these magnetic fields on the human body must be addressed in the future.

Gaussmeters have traditionally been used to measure magnetic flux. This is a device that can measure the strength and weakness of a magnetic field simply by inserting a probe into the magnetic field, and can also determine the polarity of the magnetic pole.
There is also a proton magnetometer for measuring low magnetic fields, which has been put into practical use for measuring minute magnetism such as the earth's magnetic field. Furthermore, fluxgate magnetometers have also been put into practical use.

These devices are too large and expensive to maintain their performance as measuring instruments, and are far from suitable for each person to carry. Taking the example of a worker actually working in a magnetic field, the worker moves 360 degrees, or in any direction along the X, Y, or Z axes. It is also necessary to measure this regardless of its influence. Furthermore, portability for workers to carry is also important, and the size of the measuring instruments mentioned above is far from that. The means for recording measured values in these measuring instruments is a device that uses a recorder to record meter readings or voltage values proportional to meter readings, so they cannot be used for the purpose of managing the effects of magnetic fields. Further improvements are needed, and the shape will inevitably become larger.

<Summary of the Invention> An object of the present invention is to provide a magnetic integration device that is worn by a worker and integrates an amount proportional to the strength of magnetic flux due to a magnetic field received by the worker.

According to this invention, an electric output proportional to the strength of magnetic flux is obtained by the magnetoelectric conversion means, the electric output is converted into a pulse number by the pulse number conversion means, and the pulse number is supplied to the input side of the gate circuit, The gate circuit is controlled to be open according to the gate time value and gate period set by the timer, and the number of output pulses is cumulatively counted by the counting means. Further, if necessary, the counted values of the counting means are added up for each magnetic integration device.

<Examples> Examples of the present invention will be described below with reference to the drawings. The figure shows an embodiment of a magnetic integration device according to the invention. In this example, three magneto-electric output conversion elements 1, 2 and 3 are used as magneto-electric conversion means.
For the magneto-electrical output conversion elements 1, 2, and 3, Hall elements can be used, and of course, magnetoresistive elements whose resistance changes due to magnetism may also be used. Magneto-electric output conversion element (hereinafter referred to as magneto-electric conversion element) 1, 2
and 3, since it is necessary to detect magnetism from any direction, at least one detector is arranged to detect magnetism in each of the three normal X, Y, and Z axes.

The outputs of the magnetoelectric conversion elements 1, 2, and 3 are respectively passed through preamplifiers 4, 5, and 6, which are also used to adjust variations among the elements as necessary, and are summed by an adder 7. This total value is made into an absolute value through an absolute value amplifier 8 when the influence of the magnetic pole is ignored.

In this embodiment, the electrical output of the absolute value amplifier 8 is determined using a voltage-pulse number converter (VF converter) 9.
It is converted into a number of pulses proportional to the strength of the magnetic flux. It is better to have a large number of pulses in order to improve accuracy in long-term counting control, but normally if the strength of the magnetic field received is 100 Gauss, then it should be set to 1000 counts/second. However, the magnitude of this type of magnetic field is related to distance, so it typically ranges from a few gauss to a few hundred gauss, or even a few thousand gauss in some cases, and 1000 gauss in this example.
It is necessary to construct a pulse number converter with good linearity of 10,000 counts/second, but this is possible by using semiconductor integrated circuit elements.

The output pulses of the voltage-to-pulse number converter 9 are supplied to a pulse input gate circuit 12. The number of pulses
If it is 1000 counts/second, it will be a large count value of 60000 counts per minute and 3600000 counts per hour, which will increase the price of the subsequent counter.
It is preferable to lower the count value to an economically suitable value. From this point, pulse input gate circuit 1
The count number is reduced by adjusting the opening/closing time of 2. This gate time value is 1~
It can be selected to about 0.01 seconds, and timer 13
By selecting the gate opening/closing period from several tens of seconds to several minutes, the measurement management time can be set to a value that does not saturate the subsequent counter 14 within 8 hours or 24 hours a day.

The output pulses of the pulse input gate circuit 12 are integrated and counted by a counter 14. It is desirable that the counter 14 be constructed of several chips of semiconductor integrated circuit elements, and in this embodiment, it is realized by using one or several 1-chip 12-bit counter elements. The device code generator 17 generates a code unique to the device and outputs it to the output terminal 15 of the counter 14.

Management of a plurality of magnetic integration devices of this type is realized by one count value management device 16. The count value management device 16 inputs the count value and device code of the counter from each magnetic integration device and sets the count value to 1.
By summing up the numbers for each device code over a day or several days, it becomes possible to continuously manage the count value proportional to the magnitude and amount of magnetism received. Further, the gate time width and gate period set in the timer 13 are input to the count value management device 16 as necessary. This input may be input to the count value management device 16 for each magnetic integration device by obtaining it. The count value management device 16 is composed of, for example, a so-called electronic computer.

<Effects> As detailed above, this invention makes it possible to accurately and continuously manage the strength and duration of magnetic fields, which are concerned about their effects on the human body, over a long period of time. Individual health management of people who spend long periods of time in the magnetic field of equipment becomes possible.

[Brief explanation of the drawing]

The figure is a block diagram showing an embodiment of a magnetic integration device according to the present invention. 1, 2, 3: magnetic-electrical output conversion element, 4,
5, 6: Preamplifier, 7: Adder, 8: Absolute value amplifier, 9: Voltage-pulse converter, 12: Pulse input gate circuit, 13: Timer, 14: Counter,
15: Counter output terminal, 16: Count value management device, 17: Device code generator.

Claims (1)

[Claims] 1. A magnetoelectric converter that obtains an electrical output proportional to the strength of magnetic flux, a pulse number converter that converts the output of the magnetoelectric converter into a pulse number, and a gate circuit that passes the output pulse of the pulse number converter, A magnetic integration device that integrates an amount proportional to the strength of magnetic flux, comprising a timer that sets a gate time value and a gate period of the gate circuit, and a counting means that integrates and counts the number of output pulses of the gate circuit.