JPH0434432Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for precisely detecting the intensity of light whose intensity varies over a very wide range at each intensity.

When detecting light with varying intensity at high speed,
If the range of variation is large, it is difficult to obtain a detector that can respond over the entire range. In particular, when a photomultiplier tube is used to convert the intensity of light into a change in current for detection, the rate of change in light intensity is significantly expanded. Therefore, not only is detection difficult, but the output current of the photomultiplier tube itself becomes saturated, making detection impossible. The present invention eliminates these drawbacks and provides a photodetector that can respond to a very wide range of intensity changes.

The present invention separates the light to be detected into a plurality of optical paths and makes each of them incident on a photoelectric conversion means such as a photomultiplier tube, and also provides a light attenuator with an appropriate attenuation ratio different from each other in each optical path. A switching means is inserted between one observation means and the plurality of photoelectric conversion means, and the switching means is operated according to the output of the photoelectric conversion means, and a signal corresponding to the operating position is transmitted to the observation means. In addition to this, it is also possible to record or read the information at the same time. That is, unlike the case of switching the intensity of light incident on a photomultiplier tube or the like, high-speed switching can be performed by electronic switching means without requiring a mechanical moving part. Therefore, it is possible to continuously record or read light intensity changes over an extremely wide range with one observation means, and it also has the advantage of being able to easily respond to changes in the high speed of light.

The drawing shows the configuration of the embodiment of the present invention, in which semitransparent reflectors 2, 2, and 3 are attached to a base 1 in parallel, and the light p to be detected is directed to the reflector 2 at the end. The beam is set to be incident at a 45 degree angle. Further, light absorption plates 5.5... are attached to the base 4 so as to face the second and subsequent reflecting mirrors 2.2... and 3 from the end, and furthermore, the light absorption plates 5.5... are attached to the base 6 on the side thereof. Photomultiplier tubes 7.7 are installed to face the absorption plates 5.2 and 5.5, respectively, so that light transmitted through or reflected by the reflecting mirrors 2.2 and 3 is incident. . The output of each photomultiplier tube 7.7... is applied to a switching device 8 using electronic means, for example, and the output is applied to a recorder 9 as a light intensity observation means. The output is applied to a controller 10, and the output of this controller controls a switch 8, and a signal corresponding to the switching position is applied to a recorder 9, and for example, a symbol corresponding to this signal is placed near each record. is displayed.

In the above device, a portion of the light p passes through the semi-transparent reflector 2 and enters one of the photomultiplier tubes 7. The other part is reflected by the reflecting mirror and enters the adjacent reflecting mirror 2, and a part of this incident light is reflected and attenuated by the light absorption plate 5, and then enters the second photomultiplier tube 7. incident. Furthermore, a portion of the light that has passed through the reflecting mirror is reflected and is moderately attenuated by the light absorption plate before entering the third photomultiplier tube. incident on the mirror. The light that has entered the last reflecting mirror 3 in this manner is appropriately absorbed by the light absorption plate 5 and then enters the photomultiplier tube 7 at the final stage. The outputs of the plurality of photomultiplier tubes 7, 7, . For example, the controller 10 switches the switch 8 each time the output of the first-stage photomultiplier tube 7 reaches an appropriate value close to its saturation value, or reaches the recording limit of the recorder 9, and also switches the switch 8 to correspond to the switching terminal. The signal is applied to the recorder 9, and a signal corresponding to the above signal is displayed near the analog recording line or digital recording. In addition, the light incident on the photomultiplier tubes 7.7... is reflected by the semi-transparent reflecting mirrors 2.2... and the light absorption plate 5.5.
As a result of the absorption of ..., its strength gradually decreases, for example, to about 1/1000. For this reason, if the upper limit of the recording range of the recorder 9 is set to, for example, 1000 units, each time the light to be observed increases and reaches this value, the switch operates and switches the photomultiplier tube 7.
The incident light is reduced to 1/1000 by absorption by the light absorption plate 5 and the like, and the symbol displayed on the side of the record is converted. Therefore, changes in light intensity over an extremely wide range can be precisely and virtually continuously recorded.

[Brief explanation of the drawing]

The drawings are diagrams showing the configuration of an embodiment of the present invention. In the figure, p is incident light, 2 is a translucent reflecting mirror, 3 is a reflecting mirror, 5 is an absorption plate, 7 is a photomultiplier tube, 9 is a recorder, and 10 is a controller.

Claims (1)

[Scope of utility model registration request] means for separating the light to be detected into a plurality of optical paths; means for sequentially attenuating the intensity of the light in each of the optical paths at a predetermined rate; and a plurality of means for respectively detecting each light attenuated by the above means. a photoelectric conversion means, a switching means for switching the output of each of the photoelectric conversion means and sending out a selected output, an observation means to which the output obtained from the switching means is added as an input signal; A light comprising a control means that detects an output and sequentially performs a switching operation of the switching means each time the output exceeds a predetermined value, and at the same time applies a signal corresponding to the attenuation rate of the intensity of the light to the observation means. Detection device.