Seismometer

Abstract

Seismometer (1) comprising - a container (1.1), - in the container (1.1) a fluid (1.2) filled up to a target mark (1.4), - a radiation emitter (1.8) whose beam (S) is directed towards the surface (1.3) of the liquid (1.2); - a radiation receiver (1.9) for receiving the radiation reflected from the surface (1.3) of the liquid (1.2); - a storage device (1.5) for storing the radiation parameters detected by the radiation receiver (1.9); - a comparison device (1.6) for comparing radiation parameters recorded and stored at different times.

Description

[0001] The invention relates to a seismometer according to claim 1.

[0002] Seismometers are used to detect vibrations, particularly those of the Earth's surface, for example, to record earthquakes. Conventional seismometers typically consist of a suspended mass whose relative motion to the Earth's surface can be measured. These seismometers are bulky and expensive.

[0003] The invention is based on the objective of creating a seismometer that, despite high sensitivity, has relatively small dimensions and can also be manufactured inexpensively.

[0004] This problem is solved by a seismometer according to claim 1.

[0005] Advantageous further developments of the seismometer emerge from the sub-requirements.

[0006] The invention is explained in more detail below with reference to the drawing.

[0007] This shows Fig. 1: a first embodiment of the seismometer; Fig. 2: a second embodiment of the seismometer.

[0008] The seismometer 1 comprises a container 1.1 filled with a liquid 1.2 up to a setpoint 1.4. Associated with the container are a radiation transmitter 1.8 and a radiation receiver 1.9. A beam S emitted by the radiation transmitter 1.8 strikes the surface 1.3 of the liquid 1.2 and is reflected onto the radiation receiver 1.9. A storage device 1.5 is connected to the output of the radiation receiver 1.9. The output of the storage device 1.5 is connected to a comparator 1.6. The output of the comparator 1.6 is connected to a signaling device 1.7. Water or glycerin can preferably be used as the liquid 1.2. The sensitivity of the seismometer 1 can be influenced, within certain limits, by the viscosity of the liquid 1.2.

[0009] The following describes the operation of seismometer 1. First, a calibration process is performed. For this purpose, the operational seismometer 1 is set up in a position that is as vibration-free as possible. The beam S emitted by the transmitter 1.8 strikes the surface 1.3 of the fluid 1.2, is reflected there, and then reaches the receiver 1.9. The signal received by the receiver 1.9 represents the state of the surface 1.3 of the fluid 1.2 in a vibration-free state of the seismometer 1. This signal is sent to the storage device 1.5 and permanently stored there. Subsequently, the stored signal serves as a reference value and comparison parameter for later recorded signals. The comparison of the signals takes place in the comparator 1.6. Any subsequent vibration of the seismometer 1 changes the shape of the surface 1.3 of the fluid 1.2 and therefore focuses on the signal received by the radiation receiver. As soon as a predefined limit is exceeded, the signaling device 1.7 can be activated and issue a warning signal.

[0010] In the further embodiment of a seismometer 1 shown in the figure, a floating reflector 1.10 is additionally provided on the surface 1.3 of the liquid 1.2. This reflector 1.10 improves the reflection of the beam S towards the radiation receiver 1.9. Reference symbol list 1 seismometer 1.1 Container 1.2 Fluid 1.3 Surface 1.4 Target mark 1.5 Storage setup 1.6 Comparative Institution 1.7 Signaling device 1.8 Radiation transmitters 1.9 Radiation receiver 1.10 Reflector S beam

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