Origin

 

Tension expresses feeling feeling implement use crystal make it, crystal is anisotropy, be not crystal is isotropy. Certain crystal medium, should be produced along certain way by mechanical power effect when be out of shape, produced polarization effect; After be being removed when mechanical power, can return not electrified condition afresh again, get namely tension or pressure when, certain crystal may produce the effect that gives report, this is effect of so called polarization. The scientist gave tensional sensor according to this effect development namely.

 

Working principle

 

By its working principle can be divided again for meet an emergency piece model with small displacement model. Meet an emergency piece model it is tensional meet an emergency piece and reduce strain piece join together according to bridge means, the meet an emergency when the pressure outside should getting piece resistance also is changed subsequently, the direct ratio of much major general that changes a value gets tensional bulk at place; Small displacement it is to pass outside force to bring to bear on laden, make board reed produces displacement, receive transformer to detect through difference next a tension, because the displacement of board reed measures minimum, about ±200μm[1] , call small displacement tension detector so. Additional, go up to divide again by exterior structure for: The axial table, type that wear an axis, cantilever type.

 

Detect method

 

Tensional sensor lives daily in people medium a lot of domains are having very fundamental application, everybody must notice to ensure tensional sensor can work normally in using a process, below electrical engineering forum is small make up those who will to everybody introduce tensional sensor to detect method.

 

The detecting that electric breakdown often uses the machine tool of tensional sensor the method basically has voltage law, resistance standard, short circuit law, open circuit law and voltaic law to wait a moment.

 

 

1. voltage law

 

The voltage value that uses appearance to measure circuit to go up some a little bit will judge affirmatory machine tool the limits that electric breakdown nods or yuan the method of breakdown of parts of an apparatus calls voltage the law or voltage measures a way.

 

2. resistance standard

 

Use what appearance measures dot or a certain yuan of some parts of an apparatus on circuit to connect the method that will decide breakdown is nodded to call resistor the law.

 

Law of 3. short circuit

 

The some class circuit that place suspicion malfunctions or yuan parts of an apparatus is temporarily short receive, observation state of fault has will conclude steadily the method of breakdown place. When short circuit law is used at checking multistage circuit, short circuit some white clothing, breakdown disappears or reduce apparently, before explaining breakdown is nodded in short circuit, breakdown is steadily after short circuit dot. Like some class output carries potential abnormal, carry the input of this class short circuit, it is normal to if be outputted right now,carry potential, criterion this class circuit is normal. Short circuit law is commonly used also it is normal to will check yuan of parts of an apparatus, if use forceps general crystal,base of 3 class canal is mixed blast off extremely short circuit, observe condition of collector voltage change, judgement pipe has without enlarge action. In TTL number integrated circuit, whether can judgement door circuit, trigger work normally with short circuit law. silicon controlled rectifier control pole and cathode short circuit judge silicon controlled rectifier whether invalidation. Additional also but will certain appearance (like electronic voltage plan) the input carries short circuit, see appearance indicate change to judge appearance to whether be disturbed.

 

 

Law of 4. open a way

 

In overhauling machine tool circuit, sometimes to detect special need, must disconnect circuit undertake checking, this kind of method calls open circuit the law.

 

Law of 5. electric current

 

The method that will decide breakdown is nodded with the method with measure the electric current that goes up through some circuitry whether regular calls electric current the law.