Monitoring sql server 2008 with wmi

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WMI

Currently I have the following query to monitor a parameter of SQL server 2008 using PowerShell.

SELECT cntr_value as Mem_KB 
FROM sys.dm_os_performance_counters 
WHERE counter_name = 'SQL Cache Memory (KB)'

I would like to monitor the same with WMI. How is it possible? What would be the corresponding WMI namespaces for it?

I have a few more commands which I want to find out the namespaces. Here are the classes of those commands...

sys.dm_os_performance_counters
SYS.SYSPERFINFO
sys.dm_os_sys_memory
sys.dm_os_wait_stats

Any help would be greatly appreciated! Thanks in advance!

What I have tried:

I have tried with WMIexplorer.exe and WMICodeCreator.exe