Yuhai piezo materials include : hard piezo material, soft piezo
material and lead free piezo material
Soft piezo
material exhibits: larger piezoelectric constants, higher permittivity, larger
dielectric constants, higher dielectric losses, larger electromechanical
coupling factors, low mechanical quality factors, a lower coercive field, poor
linearity, and is easier to depolarize. The ideal application of soft piezo materials is sensing needs. Yuhai soft
pizeo materials are PZT-5, PZT-5H, PSnN-5 and PLiS-51.
Hard piezo
material exhibits: smaller piezoelectric constants, lower permittivity, smaller
dielectric constants, lower dielectric losses, smaller electromechanical
coupling factors, high mechanical quality factors, a higher coercive field,
better linearity, and is harder to depolarize. The ideal application of hard piezo materials is high power transducer needs. Yuhai hard pizeo materials are PZT-4, PZT-8, PCrN-4 and PBaS-4.
Yuhai company developped lead free piezo material BaTiO3 and apply for the Chinese Patent in 2011, to meet the needs of environmental protection in today's society.
Piezoelectric ceramic material
Properties and Classification
General description of material properties
Material Code
Properties
Application
Soft PZT ceramic
PZT-51
Characteristics:
larger piezoelectric constants, higher permittivity, larger dielectric
constants, higher dielectric losses, larger electromechanical coupling
factors, low mechanical quality factors, a lower coercive field, poor
linearity, and is easier to depolarize.
low-power ultrasonic transducers
PZT-52
low-frequency sound transducers
PZT-53
applications with high g coefficient, for example,
PZT-5H
microphones,vibration pickups with preamplifier
PLiS-51
low-frequency vibration measurements
PMgN-51
Hydrophones, transducers in medical diagnostics
PSnN-5
Actuators
Hard PZT ceramic
PZT-41
Characteristics: smaller
piezoelectric constants, lower permittivity, smaller dielectric
constants, lower dielectric losses, smaller electromechanical coupling
factors, high mechanical quality factors, a higher coercive field,
better linearity, and is harder to depolarize.
PZT-42
High-power acoustic applications
PZT-43
Hydroacoustics, sonar technology
PZT-82
piezomotor
PCrN-4
PBaS-4
Lead free piezo ceramic
BaTiO3
Characteristics: Low density, low curie temperature, lead free.
Ultrasonic transducers suitable for low-temperature underwater, for example ultrasonic transducer in fishfinder
Piezoelectric Material,Piezo Ceramic Element,Piezo Electric Cylinder ,Piezo Sphere Zibo Yuhai Electronic Ceramic Co., Ltd. , https://www.yhpiezo.com
Summarize 10 mistakes that are often made to upgrade LED lighting
Have you ever thought about upgrading your lighting system? Here are 10 common mistakes people often make during the process. Take a moment to read through them carefully—this could save you time, money, and headaches down the road.
1. **Inconsistent Light Distribution**
This is one of the most frequent issues when switching to LED lighting. Unlike traditional bulbs, LEDs tend to emit light in a more directional way. For example, replacing a halogen bulb with an LED might result in less spill light, which can be useful for illuminating walls in hotel corridors. Similarly, swapping fluorescent lights for LEDs might leave parts of the wall in shadow.
The best way to avoid this: Always request a sample before making a purchase.
2. **Incorrect Brightness Levels**
When replacing fluorescent lights with LEDs, don’t just match lumens. LEDs are directional, so even the same lumen output can appear brighter. However, some manufacturers may exaggerate their specifications, leading to unexpected dimness or brightness in your space.
To prevent this: Choose a reputable brand, check samples on existing fixtures, or test them in a lab setting.
3. **Too Cold a Color Temperature**
Color temperature, measured in Kelvin (K), determines the "warmth" or "coolness" of the light. Incandescent bulbs typically range around 2700K, while halogens are around 3200K. If you switch to 5000K LEDs, your space might feel overly cold and uninviting.
Avoid this by checking the specs and requesting samples to ensure the color matches your needs.
4. **Poor Color Rendering**
The Color Rendering Index (CRI) measures how accurately a light source reveals colors. A CRI of 80 or 90 is usually ideal. However, LEDs sometimes lack good red rendering (R9 value). If R9 is below 80, red objects may look dull or washed out.
Make sure to ask your supplier for detailed CRI values, including R9.
5. **Incompatibility with Dimmers**
LEDs often don’t work well with standard dimmers designed for incandescent or halogen lamps. This can lead to flickering or inconsistent dimming. The mismatched load between LEDs and dimmers can also cause damage over time.
To fix this: Test the LED with your current dimmer or use a “virtual load†like an incandescent bulb.
6. **Not Verifying the Supplier**
With many new LED suppliers entering the market, it’s important to do your homework. Check if they’re a trusted brand, part of industry associations, and whether they have a local presence. Also, verify if they’ve been tested by recognized laboratories.
Do your research online and ask others for recommendations.
7. **No Reliable Warranty**
Warranty terms can vary widely. Some require registration within 90 days, while others may not cover all issues. Ensure the warranty is valid for a reasonable period and covers any potential defects.
Always read the fine print and choose a manufacturer with a strong track record.
8. **Low Durability**
LED lifespan is often advertised as L70, meaning the light output drops to 70% of its original level. While this is standard, some manufacturers may overstate their claims. Premature failures can also occur if the product isn’t properly tested.
Ask your supplier about the testing procedures used to determine the L70 rating.
9. **Lack of Long-Term Planning**
If a fixture fails after a short period, you might find that the model is no longer available. The replacement could be a newer version that doesn’t match your existing setup, or the company may have gone out of business entirely.
Plan ahead by purchasing spare units, especially if lighting is critical for your space.
10. **Excessive Glare**
LED panels can create glare due to their concentrated light output. In offices, this can be uncomfortable for users. A good way to assess glare is by using the Unified Glare Rating (UGR), which should ideally be under 19.
Calculate the UGR or ask your vendor for an installation example that has been rated for glare.
Upgrading your lighting can be a great investment, but it's important to avoid these common pitfalls. With careful planning and attention to detail, you can achieve a more efficient, comfortable, and visually appealing space.