fill the blanks - 8
Sensors convert the physiological data into small electrical signals. Such devices are often called ….
trasducers
A thermocouple is a temperature sensor which consist of a …. between two different metals.
junction
The advantages of thermocouples are ... and small size.
accuracy
A silicon crystal doped with trivalent material is called ... Semiconductor.
any type
Thermocouple sensors in the form of probes, which can be inserted into the patient ́s ear, are used to follow temperatures during …
surgery
…… can be incorporated in the tip of a hypodermic needle
thermocouples
In the form of probes, thermocouples can be inserted into the patient’s ear and used to record .... during surgery.
temperature
A disadvantage of thermocouples is the need for a second junction in an ice and water mixture. This difficulty is avoided by calibrating them with the second junction at .... temperature
average room
A thermistor sensor is similar to a resistance thermometer in that the electrical .... changes with temperature
resistance
If a heated thermistor is placed in the respiratory air stream, it is cooled by both .... and .... The cooling effect changes the current, which is correlated to respiration.
inspiration ; expiration
A pressure transducer produces an electrical signal proportional to the ... exerted upon it.
pressure
An oximeter is used to determine the percentage of ....... of the hemoglobin.
oxygen saturation
Since the electrical output of most transducers is much too small to be displayed directly, an ..... is required
amplifier
A triode vacuum tube contains ...., and .... and a grid.
cathode ; anode
The mode of action of a moving coil meter is based on the fact that a current-carrying wire experiences a force if placed in ....
magnetic field
..... can be incorporated in the tip of a hypodermic needle.
Thermocouples
The cathode is heated to temperatures at which it releases electrons by a process called ......
thermionic emission
The moving coil meter is basically a current-measuring device, but since both voltage and resistance are related to current by ... law, the moving coil meters can be adapted to measure voltages or resistances.
Ohm's
The acronym LCD stands for ....
liquid crystal diode
Doping silicon with indium introduces extra ...., forming a p-type semiconductor.
deficiency of electrons
A defibrillator is basically a large .....
capacitor
Defibrillation is a medical technique used to counter the onset of ....
ventricular fibrillation
When high frequency voltage is applied to a sharp metal probe, it becomes an effective …. instruments
cutting
Amplifiers produce an enlarged ... of the original electrical signal.
replica
The current density is defined as the current per unit ......
area of cross section
When a resistor with a high resistance is connected in series with a galvanometer, it becomes a .....
voltmeter
Depending on the type of impurity atoms added to the intrinsic semiconductor, the resulting semiconductor may be of... or ... type.
N ; P
Microphones can be classified as .... transducers.
pressure
.... blood pressure measurements require access to the circulatory system.
Direct
An amplifier must produce a ..... of the original signal so that none of the information is lost
distorsion of free replica