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PH-8
Piezohannas
PH-8
Medical 8MHz TCD Doppler Sensor for Craniocervical Junction
Introduction:
The Doppler blood measuring device we developed can equip with 2mhz, 4mhz, 8mhz blood flow sensor to measure the different depth blood flow rate. The output interface is USB port, and input the power is standard PC power. There could offer some sort of raw data or the calculated data as Vp; Vm, Vd, PI, RI, SD, Hr. Besides, we could offer the output as bitmap spectrum when connect with your laptop or PC directly.
4MHz Craniocervical Doppler probe:
Frequency | 4MHz |
Sensitivity | -10dB |
Bandwidth(-6dB): | 30% |
Static Capacitance: | 1300 pF |
Impedance: | 50Ω |
Protection level: | IPX7 4000V（against ground） |
Length of Cable: | 2m |
Customizable: | Yes |
Technology parameters:
Model | PH-2 | PH-4 | PH-8 |
Working frequency | 2MHz±10% | 4MHz±10% | 8MHz±10% |
Working method | Pulse wave | Continuous wave | Continuous wave |
Static capacitance | 2900PF±20% | Send:1500PF±20% receive:1500PF±20% | send:500PF±20% receive: 500PF±20% |
relative sensitivity | >-9dB | >-20dB | >-15dB |
Relative bandwidth | ≥30% | ≥15% | ≥20% |
receiving-sending mixed | --- | <-50dB | <-50dB |
Main use | For brain blood flow analysis | For the carotid artery blood flow analysis | For superficial vascular blood flow analysis |
1.Main content and scope of application:
The technical requirements stipulate the main technical requirements of the unit pulse wave type (PW) and the dual-wafer separation continuous wave type (CW) ultrasonic Doppler probes, as the basis for technical inspection and evaluation.
2.Reference Standard:
ZBC41010 unit pulse - general technical requirements and measurement methods for echo ultrasonic transducers.
GB6385 Ultrasonic diagnostic equipment safety specific requirements.
3. Terms, symbols:
3.1 Working frequency fo
The frequency is corresponding to the peak value of the Doppler transducer frequency response curve consisting of a unit or a transmit-receive wafer, in MHz
3.2 Relative bandwidth △f/fo
In the frequency response curve referred to in 3.1, the ratio of the difference between the high and low frequencies fh and fl (Δf ) and fo corresponding to the 6dB drop on the optimum frequency fo:
Namely: Δf / fo = (fh―fl) /fo╳100% unit :%
3.3 Relative sensitivity
The number of decibels in the ratio of the signal voltage Vt applied to the transmitting wafer to the output voltage Vr on the receiving wafer under the specified reflecting target
Namely: Mtr=20logVr/Vt unit dB
(For a unit pulse transducer, the number of decibels in the ratio of Vt to Vr on the same wafer)
3.4 Sending-receiving signal mix Mc
The number of decibels in the ratio of the signal voltage Vt applied to the emitter wafer to the output voltage Vr on the receiving wafer when the transducer is unloaded
That is: Mc=20logVr/Vt unit dB
Medical 8MHz TCD Doppler Sensor for Craniocervical Junction
Introduction:
The Doppler blood measuring device we developed can equip with 2mhz, 4mhz, 8mhz blood flow sensor to measure the different depth blood flow rate. The output interface is USB port, and input the power is standard PC power. There could offer some sort of raw data or the calculated data as Vp; Vm, Vd, PI, RI, SD, Hr. Besides, we could offer the output as bitmap spectrum when connect with your laptop or PC directly.
4MHz Craniocervical Doppler probe:
Frequency | 4MHz |
Sensitivity | -10dB |
Bandwidth(-6dB): | 30% |
Static Capacitance: | 1300 pF |
Impedance: | 50Ω |
Protection level: | IPX7 4000V（against ground） |
Length of Cable: | 2m |
Customizable: | Yes |
Technology parameters:
Model | PH-2 | PH-4 | PH-8 |
Working frequency | 2MHz±10% | 4MHz±10% | 8MHz±10% |
Working method | Pulse wave | Continuous wave | Continuous wave |
Static capacitance | 2900PF±20% | Send:1500PF±20% receive:1500PF±20% | send:500PF±20% receive: 500PF±20% |
relative sensitivity | >-9dB | >-20dB | >-15dB |
Relative bandwidth | ≥30% | ≥15% | ≥20% |
receiving-sending mixed | --- | <-50dB | <-50dB |
Main use | For brain blood flow analysis | For the carotid artery blood flow analysis | For superficial vascular blood flow analysis |
1.Main content and scope of application:
The technical requirements stipulate the main technical requirements of the unit pulse wave type (PW) and the dual-wafer separation continuous wave type (CW) ultrasonic Doppler probes, as the basis for technical inspection and evaluation.
2.Reference Standard:
ZBC41010 unit pulse - general technical requirements and measurement methods for echo ultrasonic transducers.
GB6385 Ultrasonic diagnostic equipment safety specific requirements.
3. Terms, symbols:
3.1 Working frequency fo
The frequency is corresponding to the peak value of the Doppler transducer frequency response curve consisting of a unit or a transmit-receive wafer, in MHz
3.2 Relative bandwidth △f/fo
In the frequency response curve referred to in 3.1, the ratio of the difference between the high and low frequencies fh and fl (Δf ) and fo corresponding to the 6dB drop on the optimum frequency fo:
Namely: Δf / fo = (fh―fl) /fo╳100% unit :%
3.3 Relative sensitivity
The number of decibels in the ratio of the signal voltage Vt applied to the transmitting wafer to the output voltage Vr on the receiving wafer under the specified reflecting target
Namely: Mtr=20logVr/Vt unit dB
(For a unit pulse transducer, the number of decibels in the ratio of Vt to Vr on the same wafer)
3.4 Sending-receiving signal mix Mc
The number of decibels in the ratio of the signal voltage Vt applied to the emitter wafer to the output voltage Vr on the receiving wafer when the transducer is unloaded
That is: Mc=20logVr/Vt unit dB
