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Velocity of ultrasound in solid state material



Principle

The velocity of sound in acrylics shall be determined by time of flight reflection technique with an ultrasonic echoscope. The measurements are done by reflection method, on three cylinders of different length. Two measurement series are carried out with ultrasonic probes ...

Ultrasonic computed tomography

Principle

This experiment explains the fundamental principles of image formation with a CT algorithm. A test object is used to create an attenuation tomogram and a time-of-flight tomogram followed by a discussion of the respective differences.

Benefits

• Ideal system for education: ...

Vision defects (model experiment)

This experiment allows a vivid demonstration of short-sightedness and long-sightedness compared to the normal vision of the human eye and of how such defects can be corrected.

Structure and function of the human eye

Benefits

• minimal preparation time
• light-intense halogen lamp
• easy teaching by using the demo board for demonstration
• ideal complement to analog student experiments by directly comparable devices

Short-sightedness and its correction (myopia)

• minimal preparation time
• light-intense halogen lamp
• easy teaching by using the demo board for demonstration
• ideal complement to analog student experiments by directly comparable devices

Long-sightedness and its correction (hyperopia)

• minimal preparation time
• light-intense halogen lamp
• easy teaching by using the demo board for demonstration
• ideal complement to analog student experiments by directly comparable devices

We investigate our heartbeat - electrocardiography



Principle

The heart is a hollow, muscular organ that comprises several secondary muscles. These secondary muscles contract and relax successively, thus pumping the blood through the heart. These muscle activities can be measured electrically as a whole at the surface of the skin ...

Elektrokardiographie with SMARTsense

We investigate our muscular power - electromyography

Principle

With the exception of the heart muscle, the contractions of striated muscles can be controlled at will. This characteristic enables the observation of the activities of individual muscle groups. An electromyogram (EMG) can be used to measure (record) the electrical activity (i.e. ...

We measure our eye movements - electrooculography

Principle

With this experiment, you can find evidence of the electrical activity that is generated during the movement of your eyes. Several electrodes attached to the skin of the face measure all the changes of the electrical voltage that are caused by the movement of the eyes. This ...

Real images at a convergent lens

The Microscope

We determine our heart frequency

Principle

An electrocardiogram (ECG) enables you to observe the regular sequence of heart contractions as well as to determine your heart frequency by determining the interval between two heart contractions. In a second experiment, you will measure the heart frequencies of test persons of ...

We determine our heart frequency with SMARTsensecy

We investigate our physical fitness - the heart under stress with Cobra4

Principle

An electrocardiogram (ECG) can record the sum of the electrical activities of all of the heart muscle fibres. Under stress, cardiac activity increases in order to maintain the stability of the cardiovascular system. The heart contraction cannot be controlled at will. This ...